Changelog¶

2.28.0 / 2020-09-25¶

Array¶

Partially reverted changes to Array indexing that produces large changes. This restores the behavior from Dask 2.25.0 and earlier, with a warning when large chunks are produced. A configuration option is provided to avoid creating the large chunks, see Efficiency. (GH#6665) Tom Augspurger
Add meta to to_dask_array (GH#6651) Kyle Nicholson
Fix GH#6631 and GH#6611 (GH#6632) Rafal Wojdyla
Infer object in array reductions (GH#6629) Daniel Saxton
Adding v_based flag for svd_flip (GH#6658) Eric Czech
Fix flakey array mean (GH#6656) Sam Grayson

Core¶

Removed dsk equality check from SubgraphCallable.__eq__ (GH#6666) Mads R. B. Kristensen
Use HighLevelGraph layers everywhere in collections (GH#6510) Mads R. B. Kristensen
Adds hash dunder method to SubgraphCallable for caching purposes (GH#6424) Andrew Fulton
Stop writing commented out config files by default (GH#6647) Matthew Rocklin

DataFrame¶

Add support for collect list aggregation via agg API (GH#6655) Madhur Tandon
Slightly better error message (GH#6657) Julia Signell

2.27.0 / 2020-09-18¶

Array¶

Preserve dtype in svd (GH#6643) Eric Czech

Core¶

store(): create a single HLG layer (GH#6601) Mads R. B. Kristensen
Add pre-commit CI build (GH#6645) James Bourbeau
Update .pre-commit-config to latest black. (GH#6641) Julia Signell
Update super usage to remove Python 2 compatibility (GH#6630) Poruri Sai Rahul
Remove u string prefixes (GH#6633) Poruri Sai Rahul

DataFrame¶

Improve error message for to_sql (GH#6638) Julia Signell
Use empty list as categories (GH#6626) Julia Signell

Documentation¶

Add autofunction to array api docs for more ufuncs (GH#6644) James Bourbeau
Add a number of missing ufuncs to dask.array docs (GH#6642) Ralf Gommers
Add HelmCluster docs (GH#6290) Jacob Tomlinson

2.26.0 / 2020-09-11¶

Array¶

Backend-aware dtype inference for single-chunk svd (GH#6623) Eric Czech
Make array.reduction docstring match for dtype (GH#6624) Martin Durant
Set lower bound on compression level for svd_compressed using rows and cols (GH#6622) Eric Czech
Improve SVD consistency and small array handling (GH#6616) Eric Czech
Add svd_flip #6599 (GH#6613) Eric Czech
Handle sequences containing dask Arrays (GH#6595) Gabe Joseph
Avoid large chunks from getitem with lists (GH#6514) Tom Augspurger
Eagerly slice numpy arrays in from_array (GH#6605) Deepak Cherian
Restore ability to pickle dask arrays (GH#6594) Noah D Brenowitz
Add SVD support for short-and-fat arrays (GH#6591) Eric Czech
Add simple chunk type registry and defer as appropriate to upcast types (GH#6393) Jon Thielen
Align coarsen chunks by default (GH#6580) Deepak Cherian
Fixup reshape on unknown dimensions and other testing fixes (GH#6578) Ryan Williams

Core¶

Add validation and fixes for HighLevelGraph dependencies (GH#6588) Mads R. B. Kristensen
Fix linting issue (GH#6598) Tom Augspurger
Skip bokeh version 2.0.0 (GH#6572) John A Kirkham

DataFrame¶

Added bytes/row calculation when using meta (GH#6585) McToel
Handle min_count in Series.sum / prod (GH#6618) Daniel Saxton
Update DataFrame.set_index docstring (GH#6549) Timost
Always compute 0 and 1 quantiles during quantile calculations (GH#6564) Erik Welch
Fix wrong path when reading empty csv file (GH#6573) Abdulelah Bin Mahfoodh

Documentation¶

Doc: Troubleshooting dashboard 404 (GH#6215) Kilian Lieret
Fixup extraConfig example (GH#6625) Tom Augspurger
Update supported Python versions (GH#6609) Julia Signell
Document dask/daskhub helm chart (GH#6560) Tom Augspurger

2.25.0 / 2020-08-28¶

Core¶

Compare key hashes in subs() (GH#6559) Mads R. B. Kristensen
Rerun with latest black release (GH#6568) James Bourbeau
License update (GH#6554) Tom Augspurger

DataFrame¶

Add gs read_parquet example (GH#6548) Ray Bell

Documentation¶

Remove version from documentation page names (GH#6558) James Bourbeau
Update kubernetes-helm.rst (GH#6523) David Sheldon
Stop 2020 survey (GH#6547) Tom Augspurger

2.24.0 / 2020-08-22¶

Array¶

Fix setting random seed in tests. (GH#6518) Elliott Sales de Andrade
Support meta in apply gufunc (GH#6521) joshreback
Replace cupy.sparse with cupyx.scipy.sparse (GH#6530) John A Kirkham

Dataframe¶

Bump up tolerance for rolling tests (GH#6502) Julia Signell
Implement DatFrame.__len__ (GH#6515) Tom Augspurger
Infer arrow schema in to_parquet (for ArrowEngine`) (GH#6490) `Richard Zamora`_
Fix parquet test when no pyarrow (GH#6524) Martin Durant
Remove problematic filter arguments in ArrowEngine (GH#6527) `Richard Zamora`_
Avoid schema validation by default in ArrowEngine (GH#6536) `Richard Zamora`_

Core¶

Use unpack_collections in make_blockwise_graph (GH#6517) `Thomas Fan`_
Move key_split() from optimization.py to utils.py (GH#6529) Mads R. B. Kristensen
Make tests run on moto server (GH#6528) Martin Durant

2.23.0 / 2020-08-14¶

Array¶

Reduce np.zeros, ones, and full array size with broadcasting (GH#6491) Matthias Bussonnier
Add missing meta= for trim in map_overlap (GH#6494) Peter Andreas Entschev

Bag¶

Bag repartition partition size (GH#6371) joshreback

Core¶

Scalar.__dask_layers__() to return self._name instead of self.key (GH#6507) Mads R. B. Kristensen
Update dependencies correctly in fuse_root optimization (GH#6508) Mads R. B. Kristensen

DataFrame¶

Adds items to dataframe (GH#6503) Thomas J Fan
Include compression in write_table call (GH#6499) Julia Signell
Fixed warning in nonempty_series (GH#6485) Tom Augspurger
Intelligently determine partitions based on type of first arg (GH#6479) Matthew Rocklin
Fix pyarrow mkdirs (GH#6475) Julia Signell
Fix duplicate parquet output in to_parquet (GH#6451) michaelnarodovitch

Documentation¶

Fix documentation da.histogram (GH#6439) Roberto Panai
Add agg nunique example (GH#6404) Ray Bell
Fixed a few typos in the SQL docs (GH#6489) Mike McCarty
Docs for SQLing (GH#6453) Martin Durant

2.22.0 / 2020-07-31¶

Array¶

Compatibility for NumPy dtype deprecation (GH#6430) Tom Augspurger

Core¶

Implement sizeof for some bytes-like objects (GH#6457) John A Kirkham
HTTP error for new fsspec (GH#6446) Martin Durant
When RecursionError is raised, return uuid from tokenize function (GH#6437) Julia Signell
Install deps of upstream-dev packages (GH#6431) Tom Augspurger
Use updated link in setup.cfg (GH#6426) Zhengnan

DataFrame¶

Add single quotes around column names if strings (GH#6471) Gil Forsyth
Refactor ArrowEngine for better read_parquet performance (GH#6346) Richard (Rick) Zamora
Add tolist dispatch (GH#6444) GALI PREM SAGAR
Compatibility with pandas 1.1.0rc0 (GH#6429) Tom Augspurger
Multi value pivot table (GH#6428) joshreback
Duplicate argument definitions in to_csv docstring (GH#6411) Jun Han (Johnson) Ooi

Documentation¶

Add utility to docs to convert YAML config to env vars and back (GH#6472) Jacob Tomlinson
Fix parameter server rendering (GH#6466) Scott Sievert
Fixes broken links (GH#6403) Jim Circadian
Complete parameter server implementation in docs (GH#6449) Scott Sievert
Fix typo (GH#6436) Jack Xiaosong Xu

2.21.0 / 2020-07-17¶

Array¶

Correct error message in array.routines.gradient() (GH#6417) johnomotani
Fix blockwise concatenate for array with some dimension=1 (GH#6342) Matthias Bussonnier

Bag¶

Fix bag.take example (GH#6418) Roberto Panai

Core¶

Groups values in optimization pass should only be graph and keys – not an optimization + keys (GH#6409) Ben Zaitlen
Call custom optimizations once, with kwargs provided (GH#6382) Clark Zinzow
Include pickle5 for testing on Python 3.7 (GH#6379) John A Kirkham

DataFrame¶

Correct typo in error message (GH#6422) Tom McTiernan
Use pytest.warns to check for UserWarning (GH#6378) Richard (Rick) Zamora
Parse bytes_per_chunk keyword from string (GH#6370) Matthew Rocklin

Documentation¶

Numpydoc formatting (GH#6421) Matthias Bussonnier
Unpin numpydoc following 1.1 release (GH#6407) Gil Forsyth
Numpydoc formatting (GH#6402) Matthias Bussonnier
Add instructions for using conda when installing code for development (GH#6399) Ray Bell
Update visualize docstrings (GH#6383) Zhengnan

2.20.0 / 2020-07-02¶

Array¶

Register sizeof for numpy zero-strided arrays (GH#6343) Matthias Bussonnier
Use concatenate_lookup in concatenate (GH#6339) John A Kirkham
Fix rechunking of arrays with some zero-length dimensions (GH#6335) Matthias Bussonnier

DataFrame¶

Dispatch iloc` calls to getitem (GH#6355) Gil Forsyth
Handle unnamed pandas RangeIndex in fastparquet engine (GH#6350) Richard (Rick) Zamora
Preserve index when writing partitioned parquet datasets with pyarrow (GH#6282) Richard (Rick) Zamora
Use ignore_index for pandas’ group_split_dispatch (GH#6251) Richard (Rick) Zamora

Documentation¶

Add doc describing argument (GH#6318) asmith26

2.19.0 / 2020-06-19¶

Array¶

Cast chunk sizes to python int dtype (GH#6326) Gil Forsyth
Add shape=None to *_like() array creation functions (GH#6064) Anderson Banihirwe

Core¶

Update expected error msg for protocol difference in fsspec (GH#6331) Gil Forsyth
Fix for floats < 1 in parse_bytes (GH#6311) Gil Forsyth
Fix exception causes all over the codebase (GH#6308) Ram Rachum
Fix duplicated tests (GH#6303) James Lamb
Remove unused testing function (GH#6304) James Lamb

DataFrame¶

Add high-level CSV Subgraph (GH#6262) Gil Forsyth
Fix ValueError when merging an index-only 1-partition dataframe (GH#6309) Krishan Bhasin
Make index.map clear divisions. (GH#6285) Julia Signell

Documentation¶

Add link to 2020 survey (GH#6328) Tom Augspurger
Update bag.rst (GH#6317) Ben Shaver

2.18.1 / 2020-06-09¶

Array¶

Don’t try to set name on full (GH#6299) Julia Signell
Histogram: support lazy values for range/bins (another way) (GH#6252) Gabe Joseph

Core¶

Fix exception causes in utils.py (GH#6302) Ram Rachum
Improve performance of HighLevelGraph construction (GH#6293) Julia Signell

Documentation¶

Now readthedocs builds unrelased features’ docstrings (GH#6295) Antonio Ercole De Luca
Add asyncssh intersphinx mappings (GH#6298) Jacob Tomlinson

2.18.0 / 2020-06-05¶

Array¶

Cast slicing index to dask array if same shape as original (GH#6273) Julia Signell
Fix stack error message (GH#6268) Stephanie Gott
full & full_like: error on non-scalar fill_value (GH#6129) Huite
Support for multiple arrays in map_overlap (GH#6165) Eric Czech
Pad resample divisions so that edges are counted (GH#6255) Julia Signell

Bag¶

Random sampling of k elements from a dask bag #4799 (GH#6239) Antonio Ercole De Luca

DataFrame¶

Add dropna, sort, and ascending to sort_values (GH#5880) Julia Signell
Generalize from_dask_array (GH#6263) GALI PREM SAGAR
Add derived docstring for SeriesGroupby.nunique (GH#6284) Julia Signell
Remove NotImplementedError in resample with rule (GH#6274) Abdulelah Bin Mahfoodh
Add dd.to_sql (GH#6038) Ryan Williams

Documentation¶

Update remote data section (GH#6258) Ray Bell

2.17.2 / 2020-05-28¶

Core¶

Re-add the complete extra (GH#6257) Jim Crist-Harif

DataFrame¶

Raise error if resample isn’t going to give right answer (GH#6244) Julia Signell

2.17.1 / 2020-05-28¶

Array¶

Empty array rechunk (GH#6233) Andrew Fulton

Core¶

Make pyyaml required (GH#6250) Jim Crist-Harif
Fix install commands from ImportError (GH#6238) Gaurav Sheni
Remove issue template (GH#6249) Jacob Tomlinson

DataFrame¶

Pass ignore_index to dd_shuffle from DataFrame.shuffle (GH#6247) Richard (Rick) Zamora
Cope with missing HDF keys (GH#6204) Martin Durant
Generalize describe & quantile apis (GH#5137) GALI PREM SAGAR

2.17.0 / 2020-05-26¶

Array¶

Small improvements to da.pad (GH#6213) Mark Boer
Return tuple if multiple outputs in dask.array.apply_gufunc, add test to check for tuple (GH#6207) Kai Mühlbauer
Support stack with unknown chunksizes (GH#6195) swapna

Bag¶

Random Choice on Bags (GH#6208) Antonio Ercole De Luca

Core¶

Raise warning delayed.visualise() (GH#6216) Amol Umbarkar
Ensure other pickle arguments work (GH#6229) John A Kirkham
Overhaul fuse() config (GH#6198) Guido Imperiale
Update dask.order.order to consider “next” nodes using both FIFO and LIFO (GH#5872) Erik Welch

DataFrame¶

Use 0 as fill_value for more agg methods (GH#6245) Julia Signell
Generalize rearrange_by_column_tasks and add DataFrame.shuffle (GH#6066) Richard (Rick) Zamora
Xfail test_rolling_numba_engine for newer numba and older pandas (GH#6236) James Bourbeau
Generalize fix_overlap (GH#6240) GALI PREM SAGAR
Fix DataFrame.shape with no columns (GH#6237) noreentry
Avoid shuffle when setting a presorted index with overlapping divisions (GH#6226) Krishan Bhasin
Adjust the Parquet engine classes to allow more easily subclassing (GH#6211) Marius van Niekerk
Fix dd.merge_asof with left_on='col' & right_index=True (GH#6192) noreentry
Disable warning for concat (GH#6210) Tung Dang
Move AUTO_BLOCKSIZE out of read_csv signature (GH#6214) Jim Crist-Harif
.loc indexing with callable (GH#6185) Endre Mark Borza
Avoid apply in _compute_sum_of_squares for groupby std agg (GH#6186) Richard (Rick) Zamora
Minor correction to test_parquet (GH#6190) Brian Larsen
Adhering to the passed pat for delimeter join and fix error message (GH#6194) GALI PREM SAGAR
Skip test_to_parquet_with_get if no parquet libs available (GH#6188) Scott Sanderson

Documentation¶

Added documentation for distributed.Event class (GH#6231) Nils Braun
Doc write to remote (GH#6124) Ray Bell

2.16.0 / 2020-05-08¶

Array¶

Fix array general-reduction name (GH#6176) Nick Evans
Replace dim with shape in unravel_index (GH#6155) Julia Signell
Moment: handle all elements being masked (GH#5339) Gabe Joseph

Core¶

Remove Redundant string concatenations in dask code-base (GH#6137) GALI PREM SAGAR
Upstream compat (GH#6159) Tom Augspurger
Ensure sizeof of dict and sequences returns an integer (GH#6179) James Bourbeau
Estimate python collection sizes with random sampling (GH#6154) Florian Jetter
Update test upstream (GH#6146) Tom Augspurger
Skip test for mindeps build (GH#6144) Tom Augspurger
Switch default multiprocessing context to “spawn” (GH#4003) Itamar Turner-Trauring
Update manifest to include dask-schema (GH#6140) Ben Zaitlen

DataFrame¶

Harden inconsistent-schema handling in pyarrow-based read_parquet (GH#6160) Richard (Rick) Zamora
Add compute kwargs to methods that write data to disk (GH#6056) Krishan Bhasin
Fix issue where unique returns an index like result from backends (GH#6153) GALI PREM SAGAR
Fix internal error in map_partitions with collections (GH#6103) Tom Augspurger

Documentation¶

Add phase of computation to index TOC (GH#6157) Ben Zaitlen
Remove unused imports in scheduling script (GH#6138) James Lamb
Fix indent (GH#6147) Martin Durant
Add Tom’s log config example (GH#6143) Martin Durant

2.15.0 / 2020-04-24¶

Array¶

Update dask.array.from_array to warn when passed a Dask collection (GH#6122) James Bourbeau
Un-numpy like behaviour in dask.array.pad (GH#6042) Mark Boer
Add support for repeats=0 in da.repeat (GH#6080) James Bourbeau

Core¶

Fix yaml layout for schema (GH#6132) Ben Zaitlen
Configuration Reference (GH#6069) Ben Zaitlen
Add configuration option to turn off task fusion (GH#6087) Matthew Rocklin
Skip pyarrow on windows (GH#6094) Tom Augspurger
Set limit to maximum length of fused key (GH#6057) Lucas Rademaker
Add test against #6062 (GH#6072) Martin Durant
Bump checkout action to v2 (GH#6065) James Bourbeau

DataFrame¶

Generalize categorical calls to support cudf Categorical (GH#6113) GALI PREM SAGAR
Avoid reading _metadata on every worker (GH#6017) Richard (Rick) Zamora
Use group_split_dispatch and ignore_index in apply_concat_apply (GH#6119) Richard (Rick) Zamora
Handle new (dtype) pandas metadata with pyarrow (GH#6090) Richard (Rick) Zamora
Skip test_partition_on_cats_pyarrow if pyarrow is not installed (GH#6112) James Bourbeau
Update DataFrame len to handle columns with the same name (GH#6111) James Bourbeau
ArrowEngine bug fixes and test coverage (GH#6047) Richard (Rick) Zamora
Added mode (GH#5958) Adam Lewis

Documentation¶

Update “helm install” for helm 3 usage (GH#6130) JulianWgs
Extend preload documentation (GH#6077) Matthew Rocklin
Fixed small typo in DataFrame map_partitions() docstring (GH#6115) Eugene Huang
Fix typo: “double” should be times, not plus (GH#6091) David Chudzicki
Fix first line of array.random.* docs (GH#6063) Martin Durant
Add section about Semaphore in distributed (GH#6053) Florian Jetter

2.14.0 / 2020-04-03¶

Array¶

Added np.iscomplexobj implementation (GH#6045) Tom Augspurger

Core¶

Update test_rearrange_disk_cleanup_with_exception to pass without cloudpickle installed (GH#6052) James Bourbeau
Fixed flaky test-rearrange (GH#5977) Tom Augspurger

DataFrame¶

Use _meta_nonempty for dtype casting in stack_partitions (GH#6061) mlondschien
Fix bugs in _metadata creation and filtering in parquet ArrowEngine (GH#6023) Richard (Rick) Zamora

Documentation¶

DOC: Add name caveats (GH#6040) Tom Augspurger

2.13.0 / 2020-03-25¶

Array¶

Support dtype and other keyword arguments in da.random (GH#6030) Matthew Rocklin
Register support for cupy sparse hstack/vstack (GH#5735) Corey J. Nolet
Force self.name to str in dask.array (GH#6002) Chuanzhu Xu

Bag¶

Set rename_fused_keys to None by default in bag.optimize (GH#6000) Lucas Rademaker

Core¶

Copy dict in to_graphviz to prevent overwriting (GH#5996) JulianWgs
Stricter pandas xfail (GH#6024) Tom Augspurger
Fix CI failures (GH#6013) James Bourbeau
Update toolz to 0.8.2 and use tlz (GH#5997) Ryan Grout
Move Windows CI builds to GitHub Actions (GH#5862) James Bourbeau

DataFrame¶

Improve path-related exceptions in read_hdf (GH#6032) psimaj
Fix dtype handling in dd.concat (GH#6006) mlondschien
Handle cudf’s leftsemi and leftanti joins (GH#6025) Richard J Zamora
Remove unused npartitions variable in dd.from_pandas (GH#6019) Daniel Saxton
Added shuffle to DataFrame.random_split (GH#5980) petiop

Documentation¶

Fix indentation in scheduler-overview docs (GH#6022) Matthew Rocklin
Update task graphs in optimize docs (GH#5928) Julia Signell
Optionally get rid of intermediary boxes in visualize, and add more labels (GH#5976) Julia Signell

2.12.0 / 2020-03-06¶

Array¶

Improve reuse of temporaries with numpy (GH#5933) Bruce Merry
Make map_blocks with block_info produce a Blockwise (GH#5896) Bruce Merry
Optimize make_blockwise_graph (GH#5940) Bruce Merry
Fix axes ordering in da.tensordot (GH#5975) Gil Forsyth
Adds empty mode to array.pad (GH#5931) Thomas J Fan

Core¶

Remove toolz.memoize dependency in dask.utils (GH#5978) Ryan Grout
Close pool leaking subprocess (GH#5979) Tom Augspurger
Pin numpydoc to 0.8.0 (fix double autoescape) (GH#5961) Gil Forsyth
Register deterministic tokenization for range objects (GH#5947) James Bourbeau
Unpin msgpack in CI (GH#5930) JAmes Bourbeau
Ensure dot results are placed in unique files. (GH#5937) Elliott Sales de Andrade
Add remaining optional dependencies to Travis 3.8 CI build environment (GH#5920) James Bourbeau

DataFrame¶

Skip parquet getitem optimization for some keys (GH#5917) Tom Augspurger
Add ignore_index argument to rearrange_by_column code path (GH#5973) Richard J Zamora
Add DataFrame and Series memory_usage_per_partition methods (GH#5971) James Bourbeau
xfail test_describe when using Pandas 0.24.2 (GH#5948) James Bourbeau
Implement dask.dataframe.to_numeric (GH#5929) Julia Signell
Add new error message content when columns are in a different order (GH#5927) Julia Signell
Use shallow copy for assign operations when possible (GH#5740) Richard J Zamora

Documentation¶

Changed above to below in dask.array.triu docs (GH#5984) Henrik Andersson
Array slicing: fix typo in slice_with_int_dask_array error message (GH#5981) Gabe Joseph
Grammar and formatting updates to docstrings (GH#5963) James Lamb
Update develop doc with conda option (GH#5939) Ray Bell
Update title of DataFrame extension docs (GH#5954) James Bourbeau
Fixed typos in documentation (GH#5962) James Lamb
Add original class or module as a kwarg on _bind_* methods (GH#5946) Julia Signell
Add collect list example (GH#5938) Ray Bell
Update optimization doc for python 3 (GH#5926) Julia Signell

2.11.0 / 2020-02-19¶

Array¶

Cache result of Array.shape (GH#5916) Bruce Merry
Improve accuracy of estimate_graph_size for rechunk (GH#5907) Bruce Merry
Skip rechunk steps that do not alter chunking (GH#5909) Bruce Merry
Support dtype and other kwargs in coarsen (GH#5903) Matthew Rocklin
Push chunk override from map_blocks into blockwise (GH#5895) Bruce Merry
Avoid using rewrite_blockwise for a singleton (GH#5890) Bruce Merry
Optimize slices_from_chunks (GH#5891) Bruce Merry
Avoid unnecessary __getitem__ in block() when chunks have correct dimensionality (GH#5884) Thomas Robitaille

Bag¶

Add include_path option for dask.bag.read_text (GH#5836) Yifan Gu
Fixes ValueError in delayed execution of bagged NumPy array (GH#5828) Surya Avala

Core¶

CI: Pin msgpack (GH#5923) Tom Augspurger
Rename test_inner to test_outer (GH#5922) Shiva Raisinghani
quote should quote dicts too (GH#5905) Bruce Merry
Register a normalizer for literal (GH#5898) Bruce Merry
Improve layer name synthesis for non-HLGs (GH#5888) Bruce Merry
Replace flake8 pre-commit-hook with upstream (GH#5892) Julia Signell
Call pip as a module to avoid warnings (GH#5861) Cyril Shcherbin
Close ThreadPool at exit (GH#5852) Tom Augspurger
Remove dask.dataframe import in tokenization code (GH#5855) James Bourbeau

DataFrame¶

Require pandas>=0.23 (GH#5883) Tom Augspurger
Remove lambda from dataframe aggregation (GH#5901) Matthew Rocklin
Fix exception chaining in dataframe/__init__.py (GH#5882) Ram Rachum
Add support for reductions on empty dataframes (GH#5804) Shiva Raisinghani
Expose sort= argument for groupby (GH#5801) Richard J Zamora
Add df.empty property (GH#5711) rockwellw
Use parquet read speed-ups from fastparquet.api.paths_to_cats. (GH#5821) Igor Gotlibovych

Documentation¶

Deprecate doc_wraps (GH#5912) Tom Augspurger
Update array internal design docs for HighLevelGraph era (GH#5889) Bruce Merry
Move over dashboard connection docs (GH#5877) Matthew Rocklin
Move prometheus docs from distributed.dask.org (GH#5876) Matthew Rocklin
Removing duplicated DO block at the end (GH#5878) K.-Michael Aye
map_blocks see also (GH#5874) Tom Augspurger
More derived from (GH#5871) Julia Signell
Fix typo (GH#5866) Yetunde Dada
Fix typo in cloud.rst (GH#5860) Andrew Thomas
Add note pointing to code of conduct and diversity statement (GH#5844) Matthew Rocklin

2.10.1 / 2020-01-30¶

Fix Pandas 1.0 version comparison (GH#5851) Tom Augspurger
Fix typo in distributed diagnostics documentation (GH#5841) Gerrit Holl

2.10.0 / 2020-01-28¶

Support for pandas 1.0’s new BooleanDtype and StringDtype (GH#5815) Tom Augspurger
Compatibility with pandas 1.0’s API breaking changes and deprecations (GH#5792) Tom Augspurger
Fixed non-deterministic tokenization of some extension-array backed pandas objects (GH#5813) Tom Augspurger
Fixed handling of dataclass class objects in collections (GH#5812) Matteo De Wint
Fixed resampling with tz-aware dates when one of the endpoints fell in a non-existent time (GH#5807) dfonnegra
Delay initial Zarr dataset creation until the computation occurs (GH#5797) Chris Roat
Use parquet dataset statistics in more cases with the pyarrow engine (GH#5799) Richard J Zamora
Fixed exception in groupby.std() when some of the keys were large integers (GH#5737) H. Thomson Comer

2.9.2 / 2020-01-16¶

Array¶

Unify chunks in broadcast_arrays (GH#5765) Matthew Rocklin

Core¶

xfail CSV encoding tests (GH#5791) Tom Augspurger
Update order to handle empty dask graph (GH#5789) James Bourbeau
Redo dask.order.order (GH#5646) Erik Welch

DataFrame¶

Add transparent compression for on-disk shuffle with partd (GH#5786) Christian Wesp
Fix repr for empty dataframes (GH#5781) Shiva Raisinghani
Pandas 1.0.0RC0 compat (GH#5784) Tom Augspurger
Remove buggy assertions (GH#5783) Tom Augspurger
Pandas 1.0 compat (GH#5782) Tom Augspurger
Fix bug in pyarrow-based read_parquet on partitioned datasets (GH#5777) Richard J Zamora
Compat for pandas 1.0 (GH#5779) Tom Augspurger
Fix groupby/mean error with with categorical index (GH#5776) Richard J Zamora
Support empty partitions when performing cumulative aggregation (GH#5730) Matthew Rocklin
set_index accepts single-item unnested list (GH#5760) Wes Roach
Fixed partitioning in set index for ordered Categorical (GH#5715) Tom Augspurger

Documentation¶

Note additional use case for normalize_token.register (GH#5766) Thomas A Caswell
Update bag repartition docstring (GH#5772) Timost
Small typos (GH#5771) Maarten Breddels
Fix typo in Task Expectations docs (GH#5767) James Bourbeau
Add docs section on task expectations to graph page (GH#5764) Devin Petersohn

2.9.1 / 2019-12-27¶

Array¶

Support Array.view with dtype=None (GH#5736) Anderson Banihirwe
Add dask.array.nanmedian (GH#5684) Deepak Cherian

Core¶

xfail test_temporary_directory on Python 3.8 (GH#5734) James Bourbeau
Add support for Python 3.8 (GH#5603) James Bourbeau
Use id to dedupe constants in rewrite_blockwise (GH#5696) Jim Crist

DataFrame¶

Raise error when converting a dask dataframe scalar to a boolean (GH#5743) James Bourbeau
Ensure dataframe groupby-variance is greater than zero (GH#5728) Matthew Rocklin
Fix DataFrame.__iter__ (GH#5719) Tom Augspurger
Support Parquet filters in disjunctive normal form, like PyArrow (GH#5656) Matteo De Wint
Auto-detect categorical columns in ArrowEngine-based read_parquet (GH#5690) Richard J Zamora
Skip parquet getitem optimization tests if no engine found (GH#5697) James Bourbeau
Fix independent optimization of parquet-getitem (GH#5613) Tom Augspurger

Documentation¶

Update helm config doc (GH#5750) Ray Bell
Link to examples.dask.org in several places (GH#5733) Tom Augspurger
Add missing ” in performance report example (GH#5724) James Bourbeau
Resolve several documentation build warnings (GH#5685) James Bourbeau
add info on performance_report (GH#5713) Ben Zaitlen
Add more docs disclaimers (GH#5710) Julia Signell
Fix simple typo: wihout -> without (GH#5708) Tim Gates
Update numpydoc dependency (GH#5694) James Bourbeau

2.9.0 / 2019-12-06¶

Array¶

Fix da.std to work with NumPy arrays (GH#5681) James Bourbeau

Core¶

Register sizeof functions for Numba and RMM (GH#5668) John A Kirkham
Update meeting time (GH#5682) Tom Augspurger

DataFrame¶

Modify dd.DataFrame.drop to use shallow copy (GH#5675) Richard J Zamora
Fix bug in _get_md_row_groups (GH#5673) Richard J Zamora
Close sqlalchemy engine after querying DB (GH#5629) Krishan Bhasin
Allow dd.map_partitions to not enforce meta (GH#5660) Matthew Rocklin
Generalize concat_unindexed_dataframes to support cudf-backend (GH#5659) Richard J Zamora
Add dataframe resample methods (GH#5636) Ben Zaitlen
Compute length of dataframe as length of first column (GH#5635) Matthew Rocklin

Documentation¶

Doc fixup (GH#5665) James Bourbeau
Update doc build instructions (GH#5640) James Bourbeau
Fix ADL link (GH#5639) Ray Bell
Add documentation build (GH#5617) James Bourbeau

2.8.1 / 2019-11-22¶

Array¶

Use auto rechunking in da.rechunk if no value given (GH#5605) Matthew Rocklin

Core¶

Add simple action to activate GH actions (GH#5619) James Bourbeau

DataFrame¶

Fix “file_path_0” bug in aggregate_row_groups (GH#5627) Richard J Zamora
Add chunksize argument to read_parquet (GH#5607) Richard J Zamora
Change test_repartition_npartitions to support arch64 architecture (GH#5620) ossdev07
Categories lost after groupby + agg (GH#5423) Oliver Hofkens
Fixed relative path issue with parquet metadata file (GH#5608) Nuno Gomes Silva
Enable gpu-backed covariance/correlation in dataframes (GH#5597) Richard J Zamora

Documentation¶

Fix institutional faq and unknown doc warnings (GH#5616) James Bourbeau
Add doc for some utils (GH#5609) Tom Augspurger
Removes html_extra_path (GH#5614) James Bourbeau
Fixed See Also referencence (GH#5612) Tom Augspurger

2.8.0 / 2019-11-14¶

Array¶

Implement complete dask.array.tile function (GH#5574) Bouwe Andela
Add median along an axis with automatic rechunking (GH#5575) Matthew Rocklin
Allow da.asarray to chunk inputs (GH#5586) Matthew Rocklin

Bag¶

Use key_split in Bag name (GH#5571) Matthew Rocklin

Core¶

Switch Doctests to Py3.7 (GH#5573) Ryan Nazareth
Relax get_colors test to adapt to new Bokeh release (GH#5576) Matthew Rocklin
Add dask.blockwise.fuse_roots optimization (GH#5451) Matthew Rocklin
Add sizeof implementation for small dicts (GH#5578) Matthew Rocklin
Update fsspec, gcsfs, s3fs (GH#5588) Tom Augspurger

DataFrame¶

Add dropna argument to groupby (GH#5579) Richard J Zamora
Revert “Remove import of dask_cudf, which is now a part of cudf (GH#5568)” (GH#5590) Matthew Rocklin

Documentation¶

Add best practice for dask.compute function (GH#5583) Matthew Rocklin
Create FUNDING.yml (GH#5587) Gina Helfrich
Add screencast for coordination primitives (GH#5593) Matthew Rocklin
Move funding to .github repo (GH#5589) Tom Augspurger
Update calendar link (GH#5569) Tom Augspurger

2.7.0 / 2019-11-08¶

This release drops support for Python 3.5

Array¶

Reuse code for assert_eq util method (GH#5496) Vijayant
Update da.array to always return a dask array (GH#5510) James Bourbeau
Skip transpose on trivial inputs (GH#5523) Ryan Abernathey
Avoid NumPy scalar string representation in tokenize (GH#5527) James Bourbeau
Remove unnecessary tiledb shape constraint (GH#5545) Norman Barker
Removes bytes from sparse array HTML repr (GH#5556) James Bourbeau

Core¶

Drop Python 3.5 (GH#5528) James Bourbeau
Update the use of fixtures in distributed tests (GH#5497) Matthew Rocklin
Changed deprecated bokeh-port to dashboard-address (GH#5507) darindf
Avoid updating with identical dicts in ensure_dict (GH#5501) James Bourbeau
Test Upstream (GH#5516) Tom Augspurger
Accelerate reverse_dict (GH#5479) Ryan Grout
Update test_imports.sh (GH#5534) James Bourbeau
Support cgroups limits on cpu count in multiprocess and threaded schedulers (GH#5499) Albert DeFusco
Update minimum pyarrow version on CI (GH#5562) James Bourbeau
Make cloudpickle optional (GH#5511) Guido Imperiale

DataFrame¶

Add an example of index_col usage (GH#3072) Bruno Bonfils
Explicitly use iloc for row indexing (GH#5500) Krishan Bhasin
Accept dask arrays on columns assignemnt (GH#5224) Henrique Ribeiro-
Implement unique and value_counts for SeriesGroupBy (GH#5358) Scott Sievert
Add sizeof definition for pyarrow tables and columns (GH#5522) Richard J Zamora
Enable row-group task partitioning in pyarrow-based read_parquet (GH#5508) Richard J Zamora
Removes npartitions=’auto’ from dd.merge docstring (GH#5531) James Bourbeau
Apply enforce error message shows non-overlapping columns. (GH#5530) Tom Augspurger
Optimize meta_nonempty for repetitive dtypes (GH#5553) Petio Petrov
Remove import of dask_cudf, which is now a part of cudf (GH#5568) Mads R. B. Kristensen

Documentation¶

Make capitalization more consistent in FAQ docs (GH#5512) Matthew Rocklin
Add CONTRIBUTING.md (GH#5513) Jacob Tomlinson
Document optional dependencies (GH#5456) Prithvi MK
Update helm chart docs to reflect new chart repo (GH#5539) Jacob Tomlinson
Add Resampler to API docs (GH#5551) James Bourbeau
Fix typo in read_sql_table (GH#5554) Eric Dill
Add adaptive deployments screencast [skip ci] (GH#5566) Matthew Rocklin

2.6.0 / 2019-10-15¶

Core¶

Call ensure_dict on graphs before entering toolz.merge (GH#5486) Matthew Rocklin
Consolidating hash dispatch functions (GH#5476) Richard J Zamora

DataFrame¶

Support Python 3.5 in Parquet code (GH#5491) Ben Zaitlen
Avoid identity check in warn_dtype_mismatch (GH#5489) Tom Augspurger
Enable unused groupby tests (GH#3480) Jörg Dietrich
Remove old parquet and bcolz dataframe optimizations (GH#5484) Matthew Rocklin
Add getitem optimization for read_parquet (GH#5453) Tom Augspurger
Use _constructor_sliced method to determine Series type (GH#5480) Richard J Zamora
Fix map(series) for unsorted base series index (GH#5459) Justin Waugh
Fix KeyError with Groupby label (GH#5467) Ryan Nazareth

Documentation¶

Use Zoom meeting instead of appear.in (GH#5494) Matthew Rocklin
Added curated list of resources (GH#5460) Javad
Update SSH docs to include SSHCluster (GH#5482) Matthew Rocklin
Update “Why Dask?” page (GH#5473) Matthew Rocklin
Fix typos in docstrings (GH#5469) garanews

2.5.2 / 2019-10-04¶

Array¶

Correct chunk size logic for asymmetric overlaps (GH#5449) Ben Jeffery
Make da.unify_chunks public API (GH#5443) Matthew Rocklin

DataFrame¶

Fix dask.dataframe.fillna handling of Scalar object (GH#5463) Zhenqing Li

Documentation¶

Remove boxes in Spark comparison page (GH#5445) Matthew Rocklin
Add latest presentations (GH#5446) Javad
Update cloud documentation (GH#5444) Matthew Rocklin

2.5.0 / 2019-09-27¶

Core¶

Add sentinel no_default to get_dependencies task (GH#5420) James Bourbeau
Update fsspec version (GH#5415) Matthew Rocklin
Remove PY2 checks (GH#5400) Jim Crist

DataFrame¶

Add option to not check meta in dd.from_delayed (GH#5436) Christopher J. Wright
Fix test_timeseries_nulls_in_schema failures with pyarrow master (GH#5421) Richard J Zamora
Reduce read_metadata output size in pyarrow/parquet (GH#5391) Richard J Zamora
Test numeric edge case for repartition with npartitions. (GH#5433) amerkel2
Unxfail pandas-datareader test (GH#5430) Tom Augspurger
Add DataFrame.pop implementation (GH#5422) Matthew Rocklin
Enable merge/set_index for cudf-based dataframes with cupy values (GH#5322) Richard J Zamora
drop_duplicates support for positional subset parameter (GH#5410) Wes Roach

Documentation¶

Add screencasts to array, bag, dataframe, delayed, futures and setup (GH#5429) (GH#5424) Matthew Rocklin
Fix delimeter parsing documentation (GH#5428) Mahmut Bulut
Update overview image (GH#5404) James Bourbeau

2.4.0 / 2019-09-13¶

Array¶

Adds explicit h5py.File mode (GH#5390) James Bourbeau
Provides method to compute unknown array chunks sizes (GH#5312) Scott Sievert
Ignore runtime warning in Array compute_meta (GH#5356) estebanag
Add _meta to Array.__dask_postpersist__ (GH#5353) Benoit Bovy
Fixup da.asarray and da.asanyarray for datetime64 dtype and xarray objects (GH#5334) Stephan Hoyer
Add shape implementation (GH#5293) Tom Augspurger
Add chunktype to array text repr (GH#5289) James Bourbeau
Array.random.choice: handle array-like non-arrays (GH#5283) Gabe Joseph

Core¶

Remove deprecated code (GH#5401) Jim Crist
Fix funcname when vectorized func has no __name__ (GH#5399) James Bourbeau
Truncate funcname to avoid long key names (GH#5383) Matthew Rocklin
Add support for numpy.vectorize in funcname (GH#5396) James Bourbeau
Fixed HDFS upstream test (GH#5395) Tom Augspurger
Support numbers and None in parse_bytes/timedelta (GH#5384) Matthew Rocklin
Fix tokenizing of subindexes on memmapped numpy arrays (GH#5351) Henry Pinkard
Upstream fixups (GH#5300) Tom Augspurger

DataFrame¶

Allow pandas to cast type of statistics (GH#5402) Richard J Zamora
Preserve index dtype after applying dd.pivot_table (GH#5385) therhaag
Implement explode for Series and DataFrame (GH#5381) Arpit Solanki
set_index on categorical fails with less categories than partitions (GH#5354) Oliver Hofkens
Support output to a single CSV file (GH#5304) Hongjiu Zhang
Add groupby().transform() (GH#5327) Oliver Hofkens
Adding filter kwarg to pyarrow dataset call (GH#5348) Richard J Zamora
Implement and check compression defaults for parquet (GH#5335) Sarah Bird
Pass sqlalchemy params to delayed objects (GH#5332) Arpit Solanki
Fixing schema handling in arrow-parquet (GH#5307) Richard J Zamora
Add support for DF and Series groupby().idxmin/max() (GH#5273) Oliver Hofkens
Add correlation calculation and add test (GH#5296) Ben Zaitlen

Documentation¶

Numpy docstring standard has moved (GH#5405) Wes Roach
Reference correct NumPy array name (GH#5403) Wes Roach
Minor edits to Array chunk documentation (GH#5372) Scott Sievert
Add methods to API docs (GH#5387) Tom Augspurger
Add namespacing to configuration example (GH#5374) Matthew Rocklin
Add get_task_stream and profile to the diagnostics page (GH#5375) Matthew Rocklin
Add best practice to load data with Dask (GH#5369) Matthew Rocklin
Update institutional-faq.rst (GH#5345) DomHudson
Add threads and processes note to the best practices (GH#5340) Matthew Rocklin
Update cuDF links (GH#5328) James Bourbeau
Fixed small typo with parentheses placement (GH#5311) Eugene Huang
Update link in reshape docstring (GH#5297) James Bourbeau

2.3.0 / 2019-08-16¶

Array¶

Raise exception when from_array is given a dask array (GH#5280) David Hoese
Avoid adjusting gufunc’s meta dtype twice (GH#5274) Peter Andreas Entschev
Add meta= keyword to map_blocks and add test with sparse (GH#5269) Matthew Rocklin
Add rollaxis and moveaxis (GH#4822) Tobias de Jong
Always increment old chunk index (GH#5256) James Bourbeau
Shuffle dask array (GH#3901) Tom Augspurger
Fix ordering when indexing a dask array with a bool dask array (GH#5151) James Bourbeau

Bag¶

Add workaround for memory leaks in bag generators (GH#5208) Marco Neumann

Core¶

Set strict xfail option (GH#5220) James Bourbeau
test-upstream (GH#5267) Tom Augspurger
Fixed HDFS CI failure (GH#5234) Tom Augspurger
Error nicely if no file size inferred (GH#5231) Jim Crist
A few changes to config.set (GH#5226) Jim Crist
Fixup black string normalization (GH#5227) Jim Crist
Pin NumPy in windows tests (GH#5228) Jim Crist
Ensure parquet tests are skipped if fastparquet and pyarrow not installed (GH#5217) James Bourbeau
Add fsspec to readthedocs (GH#5207) Matthew Rocklin
Bump NumPy and Pandas to 1.17 and 0.25 in CI test (GH#5179) John A Kirkham

DataFrame¶

Fix DataFrame.query docstring (incorrect numexpr API) (GH#5271) Doug Davis
Parquet metadata-handling improvements (GH#5218) Richard J Zamora
Improve messaging around sorted parquet columns for index (GH#5265) Martin Durant
Add rearrange_by_divisions and set_index support for cudf (GH#5205) Richard J Zamora
Fix groupby.std() with integer colum names (GH#5096) Nicolas Hug
Add Series.__iter__ (GH#5071) Blane
Generalize hash_pandas_object to work for non-pandas backends (GH#5184) GALI PREM SAGAR
Add rolling cov (GH#5154) Ivars Geidans
Add columns argument in drop function (GH#5223) Henrique Ribeiro

Documentation¶

Update institutional FAQ doc (GH#5277) Matthew Rocklin
Add draft of institutional FAQ (GH#5214) Matthew Rocklin
Make boxes for dask-spark page (GH#5249) Martin Durant
Add motivation for shuffle docs (GH#5213) Matthew Rocklin
Fix links and API entries for best-practices (GH#5246) Martin Durant
Remove “bytes” (internal data ingestion) doc page (GH#5242) Martin Durant
Redirect from our local distributed page to distributed.dask.org (GH#5248) Matthew Rocklin
Cleanup API page (GH#5247) Matthew Rocklin
Remove excess endlines from install docs (GH#5243) Matthew Rocklin
Remove item list in phases of computation doc (GH#5245) Martin Durant
Remove custom graphs from the TOC sidebar (GH#5241) Matthew Rocklin
Remove experimental status of custom collections (GH#5236) James Bourbeau
Adds table of contents to Why Dask? (GH#5244) James Bourbeau
Moves bag overview to top-level bag page (GH#5240) James Bourbeau
Remove use-cases in favor of stories.dask.org (GH#5238) Matthew Rocklin
Removes redundant TOC information in index.rst (GH#5235) James Bourbeau
Elevate dashboard in distributed diagnostics documentation (GH#5239) Martin Durant
Updates “add” layer in HLG docs example (GH#5237) James Bourbeau
Update GUFunc documentation (GH#5232) Matthew Rocklin

2.2.0 / 2019-08-01¶

Array¶

Use da.from_array(…, asarray=False) if input follows NEP-18 (GH#5074) Matthew Rocklin
Add missing attributes to from_array documentation (GH#5108) Peter Andreas Entschev
Fix meta computation for some reduction functions (GH#5035) Peter Andreas Entschev
Raise informative error in to_zarr if unknown chunks (GH#5148) James Bourbeau
Remove invalid pad tests (GH#5122) Tom Augspurger
Ignore NumPy warnings in compute_meta (GH#5103) Peter Andreas Entschev
Fix kurtosis calc for single dimension input array (GH#5177) @andrethrill
Support Numpy 1.17 in tests (GH#5192) Matthew Rocklin

Bag¶

Supply pool to bag test to resolve intermittent failure (GH#5172) Tom Augspurger

Core¶

Base dask on fsspec (GH#5064) (GH#5121) Martin Durant
Various upstream compatibility fixes (GH#5056) Tom Augspurger
Make distributed tests optional again. (GH#5128) Elliott Sales de Andrade
Fix HDFS in dask (GH#5130) Martin Durant
Ignore some more invalid value warnings. (GH#5140) Elliott Sales de Andrade

DataFrame¶

Fix pd.MultiIndex size estimate (GH#5066) Brett Naul
Generalizing has_known_categories (GH#5090) GALI PREM SAGAR
Refactor Parquet engine (GH#4995) Richard J Zamora
Add divide method to series and dataframe (GH#5094) msbrown47
fix flaky partd test (GH#5111) Tom Augspurger
Adjust is_dataframe_like to adjust for value_counts change (GH#5143) Tom Augspurger
Generalize rolling windows to support non-Pandas dataframes (GH#5149) Nick Becker
Avoid unnecessary aggregation in pivot_table (GH#5173) Daniel Saxton
Add column names to apply_and_enforce error message (GH#5180) Matthew Rocklin
Add schema keyword argument to to_parquet (GH#5150) Sarah Bird
Remove recursion error in accessors (GH#5182) Jim Crist
Allow fastparquet to handle gather_statistics=False for file lists (GH#5157) Richard J Zamora

Documentation¶

Adds NumFOCUS badge to the README (GH#5086) James Bourbeau
Update developer docs [ci skip] (GH#5093) Jim Crist
Document DataFrame.set_index computataion behavior Natalya Rapstine
Use pip install . instead of calling setup.py (GH#5139) Matthias Bussonier
Close user survey (GH#5147) Tom Augspurger
Fix Google Calendar meeting link (GH#5155) Loïc Estève
Add docker image customization example (GH#5171) James Bourbeau
Update remote-data-services after fsspec (GH#5170) Martin Durant
Fix typo in spark.rst (GH#5164) Xavier Holt
Update setup/python docs for async/await API (GH#5163) Matthew Rocklin
Update Local Storage HPC documentation (GH#5165) Matthew Rocklin

2.1.0 / 2019-07-08¶

Array¶

Add recompute= keyword to svd_compressed for lower-memory use (GH#5041) Matthew Rocklin
Change __array_function__ implementation for backwards compatibility (GH#5043) Ralf Gommers
Added dtype and shape kwargs to apply_along_axis (GH#3742) Davis Bennett
Fix reduction with empty tuple axis (GH#5025) Peter Andreas Entschev
Drop size 0 arrays in stack (GH#4978) John A Kirkham

Core¶

Removes index keyword from pandas to_parquet call (GH#5075) James Bourbeau
Fixes upstream dev CI build installation (GH#5072) James Bourbeau
Ensure scalar arrays are not rendered to SVG (GH#5058) Willi Rath
Environment creation overhaul (GH#5038) Tom Augspurger
s3fs, moto compatibility (GH#5033) Tom Augspurger
pytest 5.0 compat (GH#5027) Tom Augspurger

DataFrame¶

Fix compute_meta recursion in blockwise (GH#5048) Peter Andreas Entschev
Remove hard dependency on pandas in get_dummies (GH#5057) GALI PREM SAGAR
Check dtypes unchanged when using DataFrame.assign (GH#5047) asmith26
Fix cumulative functions on tables with more than 1 partition (GH#5034) tshatrov
Handle non-divisible sizes in repartition (GH#5013) George Sakkis
Handles timestamp and preserve_index changes in pyarrow (GH#5018) Richard J Zamora
Fix undefined meta for str.split(expand=False) (GH#5022) Brett Naul
Removed checks used for debugging merge_asof (GH#5011) Cody Johnson
Don’t use type when getting accessor in dataframes (GH#4992) Matthew Rocklin
Add melt as a method of Dask DataFrame (GH#4984) Dustin Tindall
Adds path-like support to to_hdf (GH#5003) James Bourbeau

Documentation¶

Point to latest K8s setup article in JupyterHub docs (GH#5065) Sean McKenna
Changes vizualize to visualize (GH#5061) David Brochart
Fix from_sequence typo in delayed best practices (GH#5045) James Bourbeau
Add user survey link to docs (GH#5026) James Bourbeau
Fixes typo in optimization docs (GH#5015) James Bourbeau
Update community meeting information (GH#5006) Tom Augspurger

2.0.0 / 2019-06-25¶

Array¶

Support automatic chunking in da.indices (GH#4981) James Bourbeau
Err if there are no arrays to stack (GH#4975) John A Kirkham
Asymmetrical Array Overlap (GH#4863) Michael Eaton
Dispatch concatenate where possible within dask array (GH#4669) Hameer Abbasi
Fix tokenization of memmapped numpy arrays on different part of same file (GH#4931) Henry Pinkard
Preserve NumPy condition in da.asarray to preserve output shape (GH#4945) Alistair Miles
Expand foo_like_safe usage (GH#4946) Peter Andreas Entschev
Defer order/casting einsum parameters to NumPy implementation (GH#4914) Peter Andreas Entschev
Remove numpy warning in moment calculation (GH#4921) Matthew Rocklin
Fix meta_from_array to support Xarray test suite (GH#4938) Matthew Rocklin
Cache chunk boundaries for integer slicing (GH#4923) Bruce Merry
Drop size 0 arrays in concatenate (GH#4167) John A Kirkham
Raise ValueError if concatenate is given no arrays (GH#4927) John A Kirkham
Promote types in concatenate using _meta (GH#4925) John A Kirkham
Add chunk type to html repr in Dask array (GH#4895) Matthew Rocklin
Add Dask Array._meta attribute (GH#4543) Peter Andreas Entschev
- Fix _meta slicing of flexible types (GH#4912) Peter Andreas Entschev
- Minor meta construction cleanup in concatenate (GH#4937) Peter Andreas Entschev
- Further relax Array meta checks for Xarray (GH#4944) Matthew Rocklin
- Support meta= keyword in da.from_delayed (GH#4972) Matthew Rocklin
- Concatenate meta along axis (GH#4977) John A Kirkham
- Use meta in stack (GH#4976) John A Kirkham
- Move blockwise_meta to more general compute_meta function (GH#4954) Matthew Rocklin
Alias .partitions to .blocks attribute of dask arrays (GH#4853) Genevieve Buckley
Drop outdated numpy_compat functions (GH#4850) John A Kirkham
Allow da.eye to support arbitrary chunking sizes with chunks=’auto’ (GH#4834) Anderson Banihirwe
Fix CI warnings in dask.array tests (GH#4805) Tom Augspurger
Make map_blocks work with drop_axis + block_info (GH#4831) Bruce Merry
Add SVG image and table in Array._repr_html_ (GH#4794) Matthew Rocklin
ufunc: avoid __array_wrap__ in favor of __array_function__ (GH#4708) Peter Andreas Entschev
Ensure trivial padding returns the original array (GH#4990) John A Kirkham
Test da.block with 0-size arrays (GH#4991) John A Kirkham

Core¶

Drop Python 2.7 (GH#4919) Jim Crist
Quiet dependency installs in CI (GH#4960) Tom Augspurger
Raise on warnings in tests (GH#4916) Tom Augspurger
Add a diagnostics extra to setup.py (includes bokeh) (GH#4924) John A Kirkham
Add newline delimter keyword to OpenFile (GH#4935) btw08
Overload HighLevelGraphs values method (GH#4918) James Bourbeau
Add __await__ method to Dask collections (GH#4901) Matthew Rocklin
Also ignore AttributeErrors which may occur if snappy (not python-snappy) is installed (GH#4908) Mark Bell
Canonicalize key names in config.rename (GH#4903) Ian Bolliger
Bump minimum partd to 0.3.10 (GH#4890) Tom Augspurger
Catch async def SyntaxError (GH#4836) James Bourbeau
catch IOError in ensure_file (GH#4806) Justin Poehnelt
Cleanup CI warnings (GH#4798) Tom Augspurger
Move distributed’s parse and format functions to dask.utils (GH#4793) Matthew Rocklin
Apply black formatting (GH#4983) James Bourbeau
Package license file in wheels (GH#4988) John A Kirkham

DataFrame¶

Add an optional partition_size parameter to repartition (GH#4416) George Sakkis
merge_asof and prefix_reduction (GH#4877) Cody Johnson
Allow dataframes to be indexed by dask arrays (GH#4882) Endre Mark Borza
Avoid deprecated message parameter in pytest.raises (GH#4962) James Bourbeau
Update test_to_records to test with lengths argument(GH#4515) asmith26
Remove pandas pinning in Dataframe accessors (GH#4955) Matthew Rocklin
Fix correlation of series with same names (GH#4934) Philipp S. Sommer
Map Dask Series to Dask Series (GH#4872) Justin Waugh
Warn in dd.merge on dtype warning (GH#4917) mcsoini
Add groupby Covariance/Correlation (GH#4889) Ben Zaitlen
keep index name with to_datetime (GH#4905) Ian Bolliger
Add Parallel variance computation for dataframes (GH#4865) Ksenia Bobrova
Add divmod implementation to arrays and dataframes (GH#4884) Henrique Ribeiro
Add documentation for dataframe reshape methods (GH#4896) tpanza
Avoid use of pandas.compat (GH#4881) Tom Augspurger
Added accessor registration for Series, DataFrame, and Index (GH#4829) Tom Augspurger
Add read_function keyword to read_json (GH#4810) Richard J Zamora
Provide full type name in check_meta (GH#4819) Matthew Rocklin
Correctly estimate bytes per row in read_sql_table (GH#4807) Lijo Jose
Adding support of non-numeric data to describe() (GH#4791) Ksenia Bobrova
Scalars for extension dtypes. (GH#4459) Tom Augspurger
Call head before compute in dd.from_delayed (GH#4802) Matthew Rocklin
Add support for rolling operations with larger window that partition size in DataFrames with Time-based index (GH#4796) Jorge Pessoa
Update groupby-apply doc with warning (GH#4800) Tom Augspurger
Change groupby-ness tests in _maybe_slice (GH#4786) Ben Zaitlen
Add master best practices document (GH#4745) Matthew Rocklin
Add document for how Dask works with GPUs (GH#4792) Matthew Rocklin
Add cli API docs (GH#4788) James Bourbeau
Ensure concat output has coherent dtypes (GH#4692) Guillaume Lemaitre
Fixes pandas_datareader dependencies installation (GH#4989) James Bourbeau
Accept pathlib.Path as pattern in read_hdf (GH#3335) Jörg Dietrich

Documentation¶

Move CLI API docs to relavant pages (GH#4980) James Bourbeau
Add to_datetime function to dataframe API docs Matthew Rocklin
Add documentation entry for dask.array.ma.average (GH#4970) Bouwe Andela
Add bag.read_avro to bag API docs (GH#4969) James Bourbeau
Fix typo (GH#4968) mbarkhau
Docs: Drop support for Python 2.7 (GH#4932) Hugo
Remove requirement to modify changelog (GH#4915) Matthew Rocklin
Add documentation about meta column order (GH#4887) Tom Augspurger
Add documentation note in DataFrame.shift (GH#4886) Tom Augspurger
Docs: Fix typo (GH#4868) Paweł Kordek
Put do/don’t into boxes for delayed best practice docs (GH#3821) Martin Durant
Doc fixups (GH#2528) Tom Augspurger
Add quansight to paid support doc section (GH#4838) Martin Durant
Add document for custom startup (GH#4833) Matthew Rocklin
Allow utils.derive_from to accept functions, apply across array (GH#4804) Martin Durant
Add “Avoid Large Partitions” section to best practices (GH#4808) Matthew Rocklin
Update URL for joblib to new website hosting their doc (GH#4816) Christian Hudon

1.2.2 / 2019-05-08¶

Array¶

Clarify regions kwarg to array.store (GH#4759) Martin Durant
Add dtype= parameter to da.random.randint (GH#4753) Matthew Rocklin
Use “row major” rather than “C order” in docstring (GH#4452) @asmith26
Normalize Xarray datasets to Dask arrays (GH#4756) Matthew Rocklin
Remove normed keyword in da.histogram (GH#4755) Matthew Rocklin

Bag¶

Add key argument to Bag.distinct (GH#4423) Daniel Severo

Core¶

Add core dask config file (GH#4774) Matthew Rocklin
Add core dask config file to MANIFEST.in (GH#4780) James Bourbeau
Enabling glob with HTTP file-system (GH#3926) Martin Durant
HTTPFile.seek with whence=1 (GH#4751) Martin Durant
Remove config key normalization (GH#4742) Jim Crist

DataFrame¶

Remove explicit references to Pandas in dask.dataframe.groupby (GH#4778) Matthew Rocklin
Add support for group_keys kwarg in DataFrame.groupby() (GH#4771) Brian Chu
Describe doc (GH#4762) Martin Durant
Remove explicit pandas check in cumulative aggregations (GH#4765) Nick Becker
Added meta for read_json and test (GH#4588) Abhinav Ralhan
Add test for dtype casting (GH#4760) Martin Durant
Document alignment in map_partitions (GH#4757) Jim Crist
Implement Series.str.split(expand=True) (GH#4744) Matthew Rocklin

Documentation¶

Tweaks to develop.rst from trying to run tests (GH#4772) Christian Hudon
Add document describing phases of computation (GH#4766) Matthew Rocklin
Point users to Dask-Yarn from spark documentation (GH#4770) Matthew Rocklin
Update images in delayed doc to remove labels (GH#4768) Martin Durant
Explain intermediate storage for dask arrays (GH#4025) John A Kirkham
Specify bash code-block in array best practices (GH#4764) James Bourbeau
Add array best practices doc (GH#4705) Matthew Rocklin
Update optimization docs now that cull is not automatic (GH#4752) Matthew Rocklin

1.2.1 / 2019-04-29¶

Array¶

Fix map_blocks with block_info and broadcasting (GH#4737) Bruce Merry
Make ‘minlength’ keyword argument optional in da.bincount (GH#4684) Genevieve Buckley
Add support for map_blocks with no array arguments (GH#4713) Bruce Merry
Add dask.array.trace (GH#4717) Danilo Horta
Add sizeof support for cupy.ndarray (GH#4715) Peter Andreas Entschev
Add name kwarg to from_zarr (GH#4663) Michael Eaton
Add chunks=’auto’ to from_array (GH#4704) Matthew Rocklin
Raise TypeError if dask array is given as shape for da.ones, zeros, empty or full (GH#4707) Genevieve Buckley
Add TileDB backend (GH#4679) Isaiah Norton

Core¶

Delay long list arguments (GH#4735) Matthew Rocklin
Bump to numpy >= 1.13, pandas >= 0.21.0 (GH#4720) Jim Crist
Remove file “test” (GH#4710) James Bourbeau
Reenable development build, uses upstream libraries (GH#4696) Peter Andreas Entschev
Remove assertion in HighLevelGraph constructor (GH#4699) Matthew Rocklin

DataFrame¶

Change cum-aggregation last-nonnull-value algorithm (GH#4736) Nick Becker
Fixup series-groupby-apply (GH#4738) Jim Crist
Refactor array.percentile and dataframe.quantile to use t-digest (GH#4677) Janne Vuorela
Allow naive concatenation of sorted dataframes (GH#4725) Matthew Rocklin
Fix perf issue in dd.Series.isin (GH#4727) Jim Crist
Remove hard pandas dependency for melt by using methodcaller (GH#4719) Nick Becker
A few dataframe metadata fixes (GH#4695) Jim Crist
Add Dataframe.replace (GH#4714) Matthew Rocklin
Add ‘threshold’ parameter to pd.DataFrame.dropna (GH#4625) Nathan Matare

Documentation¶

Add warning about derived docstrings early in the docstring (GH#4716) Matthew Rocklin
Create dataframe best practices doc (GH#4703) Matthew Rocklin
Uncomment dask_sphinx_theme (GH#4728) James Bourbeau
Fix minor typo fix in a Queue/fire_and_forget example (GH#4709) Matthew Rocklin
Update from_pandas docstring to match signature (GH#4698) James Bourbeau

1.2.0 / 2019-04-12¶

Array¶

Fixed mean() and moment() on sparse arrays (GH#4525) Peter Andreas Entschev
Add test for NEP-18. (GH#4675) Hameer Abbasi
Allow None to say “no chunking” in normalize_chunks (GH#4656) Matthew Rocklin
Fix limit value in auto_chunks (GH#4645) Matthew Rocklin

Core¶

Updated diagnostic bokeh test for compatibility with bokeh>=1.1.0 (GH#4680) Philipp Rudiger
Adjusts codecov’s target/threshold, disable patch (GH#4671) Peter Andreas Entschev
Always start with empty http buffer, not None (GH#4673) Martin Durant

DataFrame¶

Propagate index dtype and name when create dask dataframe from array (GH#4686) Henrique Ribeiro
Fix ordering of quantiles in describe (GH#4647) gregrf
Clean up and document rearrange_column_by_tasks (GH#4674) Matthew Rocklin
Mark some parquet tests xfail (GH#4667) Peter Andreas Entschev
Fix parquet breakages with arrow 0.13.0 (GH#4668) Martin Durant
Allow sample to be False when reading CSV from a remote URL (GH#4634) Ian Rose
Fix timezone metadata inference on parquet load (GH#4655) Martin Durant
Use is_dataframe/index_like in dd.utils (GH#4657) Matthew Rocklin
Add min_count parameter to groupby sum method (GH#4648) Henrique Ribeiro
Correct quantile to handle unsorted quantiles (GH#4650) gregrf

Documentation¶

Add delayed extra dependencies to install docs (GH#4660) James Bourbeau

1.1.5 / 2019-03-29¶

Array¶

Ensure that we use the dtype keyword in normalize_chunks (GH#4646) Matthew Rocklin

Core¶

Use recursive glob in LocalFileSystem (GH#4186) Brett Naul
Avoid YAML deprecation (GH#4603)
Fix CI and add set -e (GH#4605) James Bourbeau
Support builtin sequence types in dask.visualize (GH#4602)
unpack/repack orderedDict (GH#4623) Justin Poehnelt
Add da.random.randint to API docs (GH#4628) James Bourbeau
Add zarr to CI environment (GH#4604) James Bourbeau
Enable codecov (GH#4631) Peter Andreas Entschev

DataFrame¶

Support setting the index (GH#4565)
DataFrame.itertuples accepts index, name kwargs (GH#4593) Dan O’Donovan
Support non-Pandas series in dd.Series.unique (GH#4599) Ben Zaitlen
Replace use of explicit type check with ._is_partition_type predicate (GH#4533)
Remove additional pandas warnings in tests (GH#4576)
Check object for name/dtype attributes rather than type (GH#4606)
Fix comparison against pd.Series (GH#4613) amerkel2
Fixing warning from setting categorical codes to floats (GH#4624) Julia Signell
Fix renaming on index to_frame method (GH#4498) Henrique Ribeiro
Fix divisions when joining two single-partition dataframes (GH#4636) Justin Waugh
Warn if partitions overlap in compute_divisions (GH#4600) Brian Chu
Give informative meta= warning (GH#4637) Matthew Rocklin
Add informative error message to Series.__getitem__ (GH#4638) Matthew Rocklin
Add clear exception message when using index or index_col in read_csv (GH#4651) Álvaro Abella Bascarán

Documentation¶

Add documentation for custom groupby aggregations (GH#4571)
Docs dataframe joins (GH#4569)
Specify fork-based contributions (GH#4619) James Bourbeau
correct to_parquet example in docs (GH#4641) Aaron Fowles
Update and secure several references (GH#4649) Søren Fuglede Jørgensen

1.1.4 / 2019-03-08¶

Array¶

Use mask selection in compress (GH#4548) John A Kirkham
Use asarray in extract (GH#4549) John A Kirkham
Use correct dtype when test concatenation. (GH#4539) Elliott Sales de Andrade
Fix CuPy tests or properly marks as xfail (GH#4564) Peter Andreas Entschev

Core¶

Fix local scheduler callback to deal with custom caching (GH#4542) Yu Feng
Use parse_bytes in read_bytes(sample=…) (GH#4554) Matthew Rocklin

DataFrame¶

Fix up groupby-standard deviation again on object dtype keys (GH#4541) Matthew Rocklin
TST/CI: Updates for pandas 0.24.1 (GH#4551) Tom Augspurger
Add ability to control number of unique elements in timeseries (GH#4557) Matthew Rocklin
Add support in read_csv for parameter skiprows for other iterables (GH#4560) @JulianWgs

Documentation¶

DataFrame to Array conversion and unknown chunks (GH#4516) Scott Sievert
Add docs for random array creation (GH#4566) Matthew Rocklin
Fix typo in docstring (GH#4572) Shyam Saladi

1.1.3 / 2019-03-01¶

Array¶

Modify mean chunk functions to return dicts rather than arrays (GH#4513) Matthew Rocklin
Change sparse installation in CI for NumPy/Python2 compatibility (GH#4537) Matthew Rocklin

DataFrame¶

Make merge dispatchable on pandas/other dataframe types (GH#4522) Matthew Rocklin
read_sql_table - datetime index fix and index type checking (GH#4474) Joe Corbett
Use generalized form of index checking (is_index_like) (GH#4531) Ben Zaitlen
Add tests for groupby reductions with object dtypes (GH#4535) Matthew Rocklin
Fixes #4467 : Updates time_series for pandas deprecation (GH#4530) @HSR05

Documentation¶

Add missing method to documentation index (GH#4528) Bart Broere

1.1.2 / 2019-02-25¶

Array¶

Fix another unicode/mixed-type edge case in normalize_array (GH#4489) Marco Neumann
Add dask.array.diagonal (GH#4431) Danilo Horta
Call asanyarray in unify_chunks (GH#4506) Jim Crist
Modify moment chunk functions to return dicts (GH#4519) Peter Andreas Entschev

Bag¶

Don’t inline output keys in dask.bag (GH#4464) Jim Crist
Ensure that bag.from_sequence always includes at least one partition (GH#4475) Anderson Banihirwe
Implement out_type for bag.fold (GH#4502) Matthew Rocklin
Remove map from bag keynames (GH#4500) Matthew Rocklin
Avoid itertools.repeat in map_partitions (GH#4507) Matthew Rocklin

DataFrame¶

Fix relative path parsing on windows when using fastparquet (GH#4445) Janne Vuorela
Fix bug in pyarrow and hdfs (GH#4453) (GH#4455) Michał Jastrzębski
df getitem with integer slices is not implemented (GH#4466) Jim Crist
Replace cudf-specific code with dask-cudf import (GH#4470) Matthew Rocklin
Avoid groupby.agg(callable) in groupby-var (GH#4482) Matthew Rocklin
Consider uint types as numerical in check_meta (GH#4485) Marco Neumann
Fix some typos in groupby comments (GH#4494) Daniel Saxton
Add error message around set_index(inplace=True) (GH#4501) Matthew Rocklin
meta_nonempty works with categorical index (GH#4505) Jim Crist
Add module name to expected meta error message (GH#4499) Matthew Rocklin
groupby-nunique works on empty chunk (GH#4504) Jim Crist
Propogate index metadata if not specified (GH#4509) Jim Crist

Documentation¶

Update docs to use from_zarr (GH#4472) John A Kirkham
DOC: add section of Using Other S3-Compatible Services for remote-data-services (GH#4405) Aploium
Fix header level of section in changelog (GH#4483) Bruce Merry
Add quotes to pip install [skip-ci] (GH#4508) James Bourbeau

Core¶

Extend started_cbs AFTER state is initialized (GH#4460) Marco Neumann
Fix bug in HTTPFile._fetch_range with headers (GH#4479) (GH#4480) Ross Petchler
Repeat optimize_blockwise for diamond fusion (GH#4492) Matthew Rocklin

1.1.1 / 2019-01-31¶

Array¶

Add support for cupy.einsum (GH#4402) Johnnie Gray
Provide byte size in chunks keyword (GH#4434) Adam Beberg
Raise more informative error for histogram bins and range (GH#4430) James Bourbeau

DataFrame¶

Lazily register more cudf functions and move to backends file (GH#4396) Matthew Rocklin
Fix ORC tests for pyarrow 0.12.0 (GH#4413) Jim Crist
rearrange_by_column: ensure that shuffle arg defaults to ‘disk’ if it’s None in dask.config (GH#4414) George Sakkis
Implement filters for _read_pyarrow (GH#4415) George Sakkis
Avoid checking against types in is_dataframe_like (GH#4418) Matthew Rocklin
Pass username as ‘user’ when using pyarrow (GH#4438) Roma Sokolov

Delayed¶

Fix DelayedAttr return value (GH#4440) Matthew Rocklin

Documentation¶

Use SVG for pipeline graphic (GH#4406) John A Kirkham
Add doctest-modules to py.test documentation (GH#4427) Daniel Severo

Core¶

Work around psutil 5.5.0 not allowing pickling Process objects Janne Vuorela

1.1.0 / 2019-01-18¶

Array¶

Fix the average function when there is a masked array (GH#4236) Damien Garaud
Add allow_unknown_chunksizes to hstack and vstack (GH#4287) Paul Vecchio
Fix tensordot for 27+ dimensions (GH#4304) Johnnie Gray
Fixed block_info with axes. (GH#4301) Tom Augspurger
Use safe_wraps for matmul (GH#4346) Mark Harfouche
Use chunks=”auto” in array creation routines (GH#4354) Matthew Rocklin
Fix np.matmul in dask.array.Array.__array_ufunc__ (GH#4363) Stephan Hoyer
COMPAT: Re-enable multifield copy->view change (GH#4357) Diane Trout
Calling np.dtype on a delayed object works (GH#4387) Jim Crist
Rework normalize_array for numpy data (GH#4312) Marco Neumann

DataFrame¶

Add fill_value support for series comparisons (GH#4250) James Bourbeau
Add schema name in read_sql_table for empty tables (GH#4268) Mina Farid
Adjust check for bad chunks in map_blocks (GH#4308) Tom Augspurger
Add dask.dataframe.read_fwf (GH#4316) @slnguyen
Use atop fusion in dask dataframe (GH#4229) Matthew Rocklin
Use parallel_types() in from_pandas (GH#4331) Matthew Rocklin
Change DataFrame._repr_data to method (GH#4330) Matthew Rocklin
Install pyarrow fastparquet for Appveyor (GH#4338) Gábor Lipták
Remove explicit pandas checks and provide cudf lazy registration (GH#4359) Matthew Rocklin
Replace isinstance(…, pandas) with is_dataframe_like (GH#4375) Matthew Rocklin
ENH: Support 3rd-party ExtensionArrays (GH#4379) Tom Augspurger
Pandas 0.24.0 compat (GH#4374) Tom Augspurger

Documentation¶

Fix link to ‘map_blocks’ function in array api docs (GH#4258) David Hoese
Add a paragraph on Dask-Yarn in the cloud docs (GH#4260) Jim Crist
Copy edit documentation (GH#4267), (GH#4263), (GH#4262), (GH#4277), (GH#4271), (GH#4279), (GH#4265), (GH#4295), (GH#4293), (GH#4296), (GH#4302), (GH#4306), (GH#4318), (GH#4314), (GH#4309), (GH#4317), (GH#4326), (GH#4325), (GH#4322), (GH#4332), (GH#4333), Miguel Farrajota
Fix typo in code example (GH#4272) Daniel Li
Doc: Update array-api.rst (GH#4259) (GH#4282) Prabakaran Kumaresshan
Update hpc doc (GH#4266) Guillaume Eynard-Bontemps
Doc: Replace from_avro with read_avro in documents (GH#4313) Prabakaran Kumaresshan
Remove reference to “get” scheduler functions in docs (GH#4350) Matthew Rocklin
Fix typo in docstring (GH#4376) Daniel Saxton
Added documentation for dask.dataframe.merge (GH#4382) Jendrik Jördening

Core¶

Avoid recursion in dask.core.get (GH#4219) Matthew Rocklin
Remove verbose flag from pytest setup.cfg (GH#4281) Matthew Rocklin
Support Pytest 4.0 by specifying marks explicitly (GH#4280) Takahiro Kojima
Add High Level Graphs (GH#4092) Matthew Rocklin
Fix SerializableLock locked and acquire methods (GH#4294) Stephan Hoyer
Pin boto3 to earlier version in tests to avoid moto conflict (GH#4276) Martin Durant
Treat None as missing in config when updating (GH#4324) Matthew Rocklin
Update Appveyor to Python 3.6 (GH#4337) Gábor Lipták
Use parse_bytes more liberally in dask.dataframe/bytes/bag (GH#4339) Matthew Rocklin
Add a better error message when cloudpickle is missing (GH#4342) Mark Harfouche
Support pool= keyword argument in threaded/multiprocessing get functions (GH#4351) Matthew Rocklin
Allow updates from arbitrary Mappings in config.update, not only dicts. (GH#4356) Stuart Berg
Move dask/array/top.py code to dask/blockwise.py (GH#4348) Matthew Rocklin
Add has_parallel_type (GH#4395) Matthew Rocklin
CI: Update Appveyor (GH#4381) Tom Augspurger
Ignore non-readable config files (GH#4388) Jim Crist

1.0.0 / 2018-11-28¶

Array¶

Add nancumsum/nancumprod unit tests (GH#4215) Guido Imperiale

DataFrame¶

Add index to to_dask_dataframe docstring (GH#4232) James Bourbeau
Text and fix when appending categoricals with fastparquet (GH#4245) Martin Durant
Don’t reread metadata when passing ParquetFile to read_parquet (GH#4247) Martin Durant

Documentation¶

Copy edit documentation (GH#4222) (GH#4224) (GH#4228) (GH#4231) (GH#4230) (GH#4234) (GH#4235) (GH#4254) Miguel Farrajota
Updated doc for the new scheduler keyword (GH#4251) @milesial

Core¶

Avoid a few warnings (GH#4223) Matthew Rocklin
Remove dask.store module (GH#4221) Matthew Rocklin
Remove AUTHORS.md Jim Crist

0.20.2 / 2018-11-15¶

Array¶

Avoid fusing dependencies of atop reductions (GH#4207) Matthew Rocklin

Dataframe¶

Improve memory footprint for dataframe correlation (GH#4193) Damien Garaud
Add empty DataFrame check to boundary_slice (GH#4212) James Bourbeau

Documentation¶

Copy edit documentation (GH#4197) (GH#4204) (GH#4198) (GH#4199) (GH#4200) (GH#4202) (GH#4209) Miguel Farrajota
Add stats module namespace (GH#4206) James Bourbeau
Fix link in dataframe documentation (GH#4208) James Bourbeau

0.20.1 / 2018-11-09¶

Array¶

Only allocate the result space in wrapped_pad_func (GH#4153) John A Kirkham
Generalize expand_pad_width to expand_pad_value (GH#4150) John A Kirkham
Test da.pad with 2D linear_ramp case (GH#4162) John A Kirkham
Fix import for broadcast_to. (GH#4168) samc0de
Rewrite Dask Array’s pad to add only new chunks (GH#4152) John A Kirkham
Validate index inputs to atop (GH#4182) Matthew Rocklin

Core¶

Dask.config set and get normalize underscores and hyphens (GH#4143) James Bourbeau
Only subs on core collections, not subclasses (GH#4159) Matthew Rocklin
Add block_size=0 option to HTTPFileSystem. (GH#4171) Martin Durant
Add traverse support for dataclasses (GH#4165) Armin Berres
Avoid optimization on sharedicts without dependencies (GH#4181) Matthew Rocklin
Update the pytest version for TravisCI (GH#4189) Damien Garaud
Use key_split rather than funcname in visualize names (GH#4160) Matthew Rocklin

Dataframe¶

Add fix for DataFrame.__setitem__ for index (GH#4151) Anderson Banihirwe
Fix column choice when passing list of files to fastparquet (GH#4174) Martin Durant
Pass engine_kwargs from read_sql_table to sqlalchemy (GH#4187) Damien Garaud

Documentation¶

Fix documentation in Delayed best practices example that returned an empty list (GH#4147) Jonathan Fraine
Copy edit documentation (GH#4164) (GH#4175) (GH#4185) (GH#4192) (GH#4191) (GH#4190) (GH#4180) Miguel Farrajota
Fix typo in docstring (GH#4183) Carlos Valiente

0.20.0 / 2018-10-26¶

Array¶

Fuse Atop operations (GH#3998), (GH#4081) Matthew Rocklin
Support da.asanyarray on dask dataframes (GH#4080) Matthew Rocklin
Remove unnecessary endianness check in datetime test (GH#4113) Elliott Sales de Andrade
Set name=False in array foo_like functions (GH#4116) Matthew Rocklin
Remove dask.array.ghost module (GH#4121) Matthew Rocklin
Fix use of getargspec in dask array (GH#4125) Stephan Hoyer
Adds dask.array.invert (GH#4127), (GH#4131) Anderson Banihirwe
Raise informative error on arg-reduction on unknown chunksize (GH#4128), (GH#4135) Matthew Rocklin
Normalize reversed slices in dask array (GH#4126) Matthew Rocklin

Bag¶

Add bag.to_avro (GH#4076) Martin Durant

Core¶

Pull num_workers from config.get (GH#4086), (GH#4093) James Bourbeau
Fix invalid escape sequences with raw strings (GH#4112) Elliott Sales de Andrade
Raise an error on the use of the get= keyword and set_options (GH#4077) Matthew Rocklin
Add import for Azure DataLake storage, and add docs (GH#4132) Martin Durant
Avoid collections.Mapping/Sequence (GH#4138) Matthew Rocklin

Dataframe¶

Include index keyword in to_dask_dataframe (GH#4071) Matthew Rocklin
add support for duplicate column names (GH#4087) Jan Koch
Implement min_count for the DataFrame methods sum and prod (GH#4090) Bart Broere
Remove pandas warnings in concat (GH#4095) Matthew Rocklin
DataFrame.to_csv header option to only output headers in the first chunk (GH#3909) Rahul Vaidya
Remove Series.to_parquet (GH#4104) Justin Dennison
Avoid warnings and deprecated pandas methods (GH#4115) Matthew Rocklin
Swap ‘old’ and ‘previous’ when reporting append error (GH#4130) Martin Durant

Documentation¶

Copy edit documentation (GH#4073), (GH#4074), (GH#4094), (GH#4097), (GH#4107), (GH#4124), (GH#4133), (GH#4139) Miguel Farrajota
Fix typo in code example (GH#4089) Antonino Ingargiola
Add pycon 2018 presentation (GH#4102) Javad
Quick description for gcsfs (GH#4109) Martin Durant
Fixed typo in docstrings of read_sql_table method (GH#4114) TakaakiFuruse
Make target directories in redirects if they don’t exist (GH#4136) Matthew Rocklin

0.19.4 / 2018-10-09¶

Array¶

Implement apply_gufunc(..., axes=..., keepdims=...) (GH#3985) Markus Gonser

Bag¶

Fix typo in datasets.make_people (GH#4069) Matthew Rocklin

Dataframe¶

Added percentiles options for dask.dataframe.describe method (GH#4067) Zhenqing Li
Add DataFrame.partitions accessor similar to Array.blocks (GH#4066) Matthew Rocklin

Core¶

Pass get functions and Clients through scheduler keyword (GH#4062) Matthew Rocklin

Documentation¶

Fix Typo on hpc example. (missing = in kwarg). (GH#4068) Matthias Bussonier
Extensive copy-editing: (GH#4065), (GH#4064), (GH#4063) Miguel Farrajota

0.19.3 / 2018-10-05¶

Array¶

Make da.RandomState extensible to other modules (GH#4041) Matthew Rocklin
Support unknown dims in ravel no-op case (GH#4055) Jim Crist
Add basic infrastructure for cupy (GH#4019) Matthew Rocklin
Avoid asarray and lock arguments for from_array(getitem) (GH#4044) Matthew Rocklin
Move local imports in corrcoef to global imports (GH#4030) John A Kirkham
Move local indices import to global import (GH#4029) John A Kirkham
Fix-up Dask Array’s fromfunction w.r.t. dtype and kwargs (GH#4028) John A Kirkham
Don’t use dummy expansion for trim_internal in overlapped (GH#3964) Mark Harfouche
Add unravel_index (GH#3958) John A Kirkham

Bag¶

Sort result in Bag.frequencies (GH#4033) Matthew Rocklin
Add support for npartitions=1 edge case in groupby (GH#4050) James Bourbeau
Add new random dataset for people (GH#4018) Matthew Rocklin
Improve performance of bag.read_text on small files (GH#4013) Eric Wolak
Add bag.read_avro (GH#4000) (GH#4007) Martin Durant

Dataframe¶

Added an index parameter to dask.dataframe.from_dask_array() for creating a dask DataFrame from a dask Array with a given index. (GH#3991) Tom Augspurger
Improve sub-classability of dask dataframe (GH#4015) Matthew Rocklin
Fix failing hdfs test [test-hdfs] (GH#4046) Jim Crist
fuse_subgraphs works without normal fuse (GH#4042) Jim Crist
Make path for reading many parquet files without prescan (GH#3978) Martin Durant
Index in dd.from_dask_array (GH#3991) Tom Augspurger
Making skiprows accept lists (GH#3975) Julia Signell
Fail early in fastparquet read for nonexistent column (GH#3989) Martin Durant

Core¶

Add support for npartitions=1 edge case in groupby (GH#4050) James Bourbeau
Automatically wrap large arguments with dask.delayed in map_blocks/partitions (GH#4002) Matthew Rocklin
Fuse linear chains of subgraphs (GH#3979) Jim Crist
Make multiprocessing context configurable (GH#3763) Itamar Turner-Trauring

Documentation¶

Extensive copy-editing (GH#4049), (GH#4034), (GH#4031), (GH#4020), (GH#4021), (GH#4022), (GH#4023), (GH#4016), (GH#4017), (GH#4010), (GH#3997), (GH#3996), Miguel Farrajota
Update shuffle method selection docs (GH#4048) James Bourbeau
Remove docs/source/examples, point to examples.dask.org (GH#4014) Matthew Rocklin
Replace readthedocs links with dask.org (GH#4008) Matthew Rocklin
Updates DataFrame.to_hdf docstring for returned values (GH#3992) James Bourbeau

0.19.2 / 2018-09-17¶

Array¶

apply_gufunc implements automatic infer of functions output dtypes (GH#3936) Markus Gonser
Fix array histogram range error when array has nans (GH#3980) James Bourbeau
Issue 3937 follow up, int type checks. (GH#3956) Yu Feng
from_array: add @martindurant’s explaining of how hashing is done for an array. (GH#3965) Mark Harfouche
Support gradient with coordinate (GH#3949) Keisuke Fujii

Core¶

Fix use of has_keyword with partial in Python 2.7 (GH#3966) Mark Harfouche
Set pyarrow as default for HDFS (GH#3957) Matthew Rocklin

Documentation¶

Use dask_sphinx_theme (GH#3963) Matthew Rocklin
Use JupyterLab in Binder links from main page Matthew Rocklin
DOC: fixed sphinx syntax (GH#3960) Tom Augspurger

0.19.1 / 2018-09-06¶

Array¶

Don’t enforce dtype if result has no dtype (GH#3928) Matthew Rocklin
Fix NumPy issubtype deprecation warning (GH#3939) Bruce Merry
Fix arg reduction tokens to be unique with different arguments (GH#3955) Tobias de Jong
Coerce numpy integers to ints in slicing code (GH#3944) Yu Feng
Linalg.norm ndim along axis partial fix (GH#3933) Tobias de Jong

Dataframe¶

Deterministic DataFrame.set_index (GH#3867) George Sakkis
Fix divisions in read_parquet when dealing with filters #3831 #3930 (GH#3923) (GH#3931) @andrethrill
Fixing returning type in categorical.as_known (GH#3888) Sriharsha Hatwar
Fix DataFrame.assign for callables (GH#3919) Tom Augspurger
Include partitions with no width in repartition (GH#3941) Matthew Rocklin
Don’t constrict stage/k dtype in dataframe shuffle (GH#3942) Matthew Rocklin

Documentation¶

DOC: Add hint on how to render task graphs horizontally (GH#3922) Uwe Korn
Add try-now button to main landing page (GH#3924) Matthew Rocklin

0.19.0 / 2018-08-29¶

Array¶

Support coordinate in gradient (GH#3949) Keisuke Fujii
Fix argtopk split_every bug (GH#3810) Guido Imperiale
Ensure result computing dask.array.isnull() always gives a numpy array (GH#3825) Stephan Hoyer
Support concatenate for scipy.sparse in dask array (GH#3836) Matthew Rocklin
Fix argtopk on 32-bit systems. (GH#3823) Elliott Sales de Andrade
Normalize keys in rechunk (GH#3820) Matthew Rocklin
Allow shape of dask.array to be a numpy array (GH#3844) Mark Harfouche
Fix numpy deprecation warning on tuple indexing (GH#3851) Tobias de Jong
Rename ghost module to overlap (GH#3830) Robert Sare
Re-add the ghost import to da __init__ (GH#3861) Jim Crist
Ensure copy preserves masked arrays (GH#3852) Tobias de Jong

DataFrame¶

Added dtype and sparse keywords to dask.dataframe.get_dummies() (GH#3792) Tom Augspurger
Added dask.dataframe.to_dask_array() for converting a Dask Series or DataFrame to a Dask Array, possibly with known chunk sizes (GH#3884) Tom Augspurger
Changed the behavior for dask.array.asarray() for dask dataframe and series inputs. Previously, the series was eagerly converted to an in-memory NumPy array before creating a dask array with known chunks sizes. This caused unexpectedly high memory usage. Now, no intermediate NumPy array is created, and a Dask array with unknown chunk sizes is returned (GH#3884) Tom Augspurger
DataFrame.iloc (GH#3805) Tom Augspurger
When reading multiple paths, expand globs. (GH#3828) Irina Truong
Added index column name after resample (GH#3833) Eric Bonfadini
Add (lazy) shape property to dataframe and series (GH#3212) Henrique Ribeiro
Fix failing hdfs test [test-hdfs] (GH#3858) Jim Crist
Fixes for pyarrow 0.10.0 release (GH#3860) Jim Crist
Rename to_csv keys for diagnostics (GH#3890) Matthew Rocklin
Match pandas warnings for concat sort (GH#3897) Tom Augspurger
Include filename in read_csv (GH#3908) Julia Signell

Core¶

Better error message on import when missing common dependencies (GH#3771) Danilo Horta
Drop Python 3.4 support (GH#3840) Jim Crist
Remove expired deprecation warnings (GH#3841) Jim Crist
Add DASK_ROOT_CONFIG environment variable (GH#3849) Joe Hamman
Don’t cull in local scheduler, do cull in delayed (GH#3856) Jim Crist
Increase conda download retries (GH#3857) Jim Crist
Add python_requires and Trove classifiers (GH#3855) @hugovk
Fix collections.abc deprecation warnings in Python 3.7.0 (GH#3876) Jan Margeta
Allow dot jpeg to xfail in visualize tests (GH#3896) Matthew Rocklin
Add Python 3.7 to travis.yml (GH#3894) Matthew Rocklin
Add expand_environment_variables to dask.config (GH#3893) Joe Hamman

Docs¶

Fix typo in import statement of diagnostics (GH#3826) John Mrziglod
Add link to YARN docs (GH#3838) Jim Crist
fix of minor typos in landing page index.html (GH#3746) Christoph Moehl
Update delayed-custom.rst (GH#3850) Anderson Banihirwe
DOC: clarify delayed docstring (GH#3709) Scott Sievert
Add new presentations (GH#3880) Javad
Add dask array normalize_chunks to documentation (GH#3878) Daniel Rothenberg
Docs: Fix link to snakeviz (GH#3900) Hans Moritz Günther
Add missing ` to docstring (GH#3915) @rtobar

0.18.2 / 2018-07-23¶

Array¶

Reimplemented argtopk to make it release the GIL (GH#3610) Guido Imperiale
Don’t overlap on non-overlapped dimensions in map_overlap (GH#3653) Matthew Rocklin
Fix linalg.tsqr for dimensions of uncertain length (GH#3662) Jeremy Chen
Break apart uneven array-of-int slicing to separate chunks (GH#3648) Matthew Rocklin
Align auto chunks to provided chunks, rather than shape (GH#3679) Matthew Rocklin
Adds endpoint and retstep support for linspace (GH#3675) James Bourbeau
Implement .blocks accessor (GH#3689) Matthew Rocklin
Add block_info keyword to map_blocks functions (GH#3686) Matthew Rocklin
Slice by dask array of ints (GH#3407) Guido Imperiale
Support dtype in arange (GH#3722) Guido Imperiale
Fix argtopk with uneven chunks (GH#3720) Guido Imperiale
Raise error when replace=False in da.choice (GH#3765) James Bourbeau
Update chunks in Array.__setitem__ (GH#3767) Itamar Turner-Trauring
Add a chunksize convenience property (GH#3777) Jacob Tomlinson
Fix and simplify array slicing behavior when step < 0 (GH#3702) Ziyao Wei
Ensure to_zarr with return_stored True returns a Dask Array (GH#3786) John A Kirkham

Bag¶

Add last_endline optional parameter in to_textfiles (GH#3745) George Sakkis

Dataframe¶

Add aggregate function for rolling objects (GH#3772) Gerome Pistre
Properly tokenize cumulative groupby aggregations (GH#3799) Cloves Almeida

Delayed¶

Add the @ operator to the delayed objects (GH#3691) Mark Harfouche
Add delayed best practices to documentation (GH#3737) Matthew Rocklin
Fix @delayed decorator for methods and add tests (GH#3757) Ziyao Wei

Core¶

Fix extra progressbar (GH#3669) Mike Neish
Allow tasks back onto ordering stack if they have one dependency (GH#3652) Matthew Rocklin
Prefer end-tasks with low numbers of dependencies when ordering (GH#3588) Tom Augspurger
Add assert_eq to top-level modules (GH#3726) Matthew Rocklin
Test that dask collections can hold scipy.sparse arrays (GH#3738) Matthew Rocklin
Fix setup of lz4 decompression functions (GH#3782) Elliott Sales de Andrade
Add datasets module (GH#3780) Matthew Rocklin

0.18.1 / 2018-06-22¶

Array¶

from_array now supports scalar types and nested lists/tuples in input, just like all numpy functions do; it also produces a simpler graph when the input is a plain ndarray (GH#3568) Guido Imperiale
Fix slicing of big arrays due to cumsum dtype bug (GH#3620) Marco Rossi
Add Dask Array implementation of pad (GH#3578) John A Kirkham
Fix array random API examples (GH#3625) James Bourbeau
Add average function to dask array (GH#3640) James Bourbeau
Tokenize ghost_internal with axes (GH#3643) Matthew Rocklin
Add outer for Dask Arrays (GH#3658) John A Kirkham

DataFrame¶

Add Index.to_series method (GH#3613) Henrique Ribeiro
Fix missing partition columns in pyarrow-parquet (GH#3636) Martin Durant

Core¶

Minor tweaks to CI (GH#3629) Guido Imperiale
Add back dask.utils.effective_get (GH#3642) Matthew Rocklin
DASK_CONFIG dictates config write location (GH#3621) Jim Crist
Replace ‘collections’ key in unpack_collections with unique key (GH#3632) Yu Feng
Avoid deepcopy in dask.config.set (GH#3649) Matthew Rocklin

0.18.0 / 2018-06-14¶

Array¶

Add to/from_zarr for Zarr-format datasets and arrays (GH#3460) Martin Durant
Experimental addition of generalized ufunc support, apply_gufunc, gufunc, and as_gufunc (GH#3109) (GH#3526) (GH#3539) Markus Gonser
Avoid unnecessary rechunking tasks (GH#3529) Matthew Rocklin
Compute dtypes at runtime for fft (GH#3511) Matthew Rocklin
Generate UUIDs for all da.store operations (GH#3540) Martin Durant
Correct internal dimension of Dask’s SVD (GH#3517) John A Kirkham
BUG: do not raise IndexError for identity slice in array.vindex (GH#3559) Scott Sievert
Adds isneginf and isposinf (GH#3581) John A Kirkham
Drop Dask Array’s learn module (GH#3580) John A Kirkham
added sfqr (short-and-fat) as a counterpart to tsqr… (GH#3575) Jeremy Chen
Allow 0-width chunks in dask.array.rechunk (GH#3591) Marc Pfister
Document Dask Array’s nan_to_num in public API (GH#3599) John A Kirkham
Show block example (GH#3601) John A Kirkham
Replace token= keyword with name= in map_blocks (GH#3597) Matthew Rocklin
Disable locking in to_zarr (needed for using to_zarr in a distributed context) (GH#3607) John A Kirkham
Support Zarr Arrays in to_zarr/from_zarr (GH#3561) John A Kirkham
Added recursion to array/linalg/tsqr to better manage the single core bottleneck (GH#3586) Jeremy Chan (GH#3396) Guido Imperiale

Dataframe¶

Add to/read_json (GH#3494) Martin Durant
Adds index to unsupported arguments for DataFrame.rename method (GH#3522) James Bourbeau
Adds support to subset Dask DataFrame columns using numpy.ndarray, pandas.Series, and pandas.Index objects (GH#3536) James Bourbeau
Raise error if meta columns do not match dataframe (GH#3485) Christopher Ren
Add index to unsupprted argument for DataFrame.rename (GH#3522) James Bourbeau
Adds support for subsetting DataFrames with pandas Index/Series and numpy ndarrays (GH#3536) James Bourbeau
Dataframe sample method docstring fix (GH#3566) James Bourbeau
fixes dd.read_json to infer file compression (GH#3594) Matt Lee
Adds n to sample method (GH#3606) James Bourbeau
Add fastparquet ParquetFile object support (GH#3573) @andrethrill

Bag¶

Rename method= keyword to shuffle= in bag.groupby (GH#3470) Matthew Rocklin

Core¶

Replace get= keyword with scheduler= keyword (GH#3448) Matthew Rocklin
Add centralized dask.config module to handle configuration for all Dask subprojects (GH#3432) (GH#3513) (GH#3520) Matthew Rocklin
Add dask-ssh CLI Options and Description. (GH#3476) @beomi
Read whole files fix regardless of header for HTTP (GH#3496) Martin Durant
Adds synchronous scheduler syntax to debugging docs (GH#3509) James Bourbeau
Replace dask.set_options with dask.config.set (GH#3502) Matthew Rocklin
Update sphinx readthedocs-theme (GH#3516) Matthew Rocklin
Introduce “auto” value for normalize_chunks (GH#3507) Matthew Rocklin
Fix check in configuration with env=None (GH#3562) Simon Perkins
Update sizeof definitions (GH#3582) Matthew Rocklin
Remove –verbose flag from travis-ci (GH#3477) Matthew Rocklin
Remove “da.random” from random array keys (GH#3604) Matthew Rocklin

0.17.5 / 2018-05-16¶

Array¶

Fix rechunk with chunksize of -1 in a dict (GH#3469) Stephan Hoyer
einsum now accepts the split_every parameter (GH#3471) Guido Imperiale
Improved slicing performance (GH#3479) Yu Feng

DataFrame¶

Compatibility with pandas 0.23.0 (GH#3499) Tom Augspurger

0.17.4 / 2018-05-03¶

Dataframe¶

Add support for indexing Dask DataFrames with string subclasses (GH#3461) James Bourbeau
Allow using both sorted_index and chunksize in read_hdf (GH#3463) Pierre Bartet
Pass filesystem to arrow piece reader (GH#3466) Martin Durant
Switches to using dask.compat string_types (GH#3462) James Bourbeau

0.17.3 / 2018-05-02¶

Array¶

Add einsum for Dask Arrays (GH#3412) Simon Perkins
Add piecewise for Dask Arrays (GH#3350) John A Kirkham
Fix handling of nan in broadcast_shapes (GH#3356) John A Kirkham
Add isin for dask arrays (GH#3363). Stephan Hoyer
Overhauled topk for Dask Arrays: faster algorithm, particularly for large k’s; added support for multiple axes, recursive aggregation, and an option to pick the bottom k elements instead. (GH#3395) Guido Imperiale
The topk API has changed from topk(k, array) to the more conventional topk(array, k). The legacy API still works but is now deprecated. (GH#2965) Guido Imperiale
New function argtopk for Dask Arrays (GH#3396) Guido Imperiale
Fix handling partial depth and boundary in map_overlap (GH#3445) John A Kirkham
Add gradient for Dask Arrays (GH#3434) John A Kirkham

DataFrame¶

Allow t as shorthand for table in to_hdf for pandas compatibility (GH#3330) Jörg Dietrich
Added top level isna method for Dask DataFrames (GH#3294) Christopher Ren
Fix selection on partition column on read_parquet for engine="pyarrow" (GH#3207) Uwe Korn
Added DataFrame.squeeze method (GH#3366) Christopher Ren
Added infer_divisions option to read_parquet to specify whether read engines should compute divisions (GH#3387) Jon Mease
Added support for inferring division for engine="pyarrow" (GH#3387) Jon Mease
Provide more informative error message for meta= errors (GH#3343) Matthew Rocklin
add orc reader (GH#3284) Martin Durant
Default compression for parquet now always Snappy, in line with pandas (GH#3373) Martin Durant
Fixed bug in Dask DataFrame and Series comparisons with NumPy scalars (GH#3436) James Bourbeau
Remove outdated requirement from repartition docstring (GH#3440) Jörg Dietrich
Fixed bug in aggregation when only a Series is selected (GH#3446) Jörg Dietrich
Add default values to make_timeseries (GH#3421) Matthew Rocklin

Core¶

Support traversing collections in persist, visualize, and optimize (GH#3410) Jim Crist
Add schedule= keyword to compute and persist. This replaces common use of the get= keyword (GH#3448) Matthew Rocklin

0.17.2 / 2018-03-21¶

Array¶

Add broadcast_arrays for Dask Arrays (GH#3217) John A Kirkham
Add bitwise_* ufuncs (GH#3219) John A Kirkham
Add optional axis argument to squeeze (GH#3261) John A Kirkham
Validate inputs to atop (GH#3307) Matthew Rocklin
Avoid calls to astype in concatenate if all parts have the same dtype (GH#3301) Martin Durant

DataFrame¶

Fixed bug in shuffle due to aggressive truncation (GH#3201) Matthew Rocklin
Support specifying categorical columns on read_parquet with categories=[…] for engine="pyarrow" (GH#3177) Uwe Korn
Add dd.tseries.Resampler.agg (GH#3202) Richard Postelnik
Support operations that mix dataframes and arrays (GH#3230) Matthew Rocklin
Support extra Scalar and Delayed args in dd.groupby._Groupby.apply (GH#3256) Gabriele Lanaro

Bag¶

Support joining against single-partitioned bags and delayed objects (GH#3254) Matthew Rocklin

Core¶

Fixed bug when using unexpected but hashable types for keys (GH#3238) Daniel Collins
Fix bug in task ordering so that we break ties consistently with the key name (GH#3271) Matthew Rocklin
Avoid sorting tasks in order when the number of tasks is very large (GH#3298) Matthew Rocklin

0.17.1 / 2018-02-22¶

Array¶

Corrected dimension chunking in indices (GH#3166, GH#3167) Simon Perkins
Inline store_chunk calls for store’s return_stored option (GH#3153) John A Kirkham
Compatibility with struct dtypes for NumPy 1.14.1 release (GH#3187) Matthew Rocklin

DataFrame¶

Bugfix to allow column assignment of pandas datetimes(GH#3164) Max Epstein

Core¶

New file-system for HTTP(S), allowing direct loading from specific URLs (GH#3160) Martin Durant
Fix bug when tokenizing partials with no keywords (GH#3191) Matthew Rocklin
Use more recent LZ4 API (GH#3157) Thrasibule
Introduce output stream parameter for progress bar (GH#3185) Dieter Weber

0.17.0 / 2018-02-09¶

Array¶

Added a support object-type arrays for nansum, nanmin, and nanmax (GH#3133) Keisuke Fujii
Update error handling when len is called with empty chunks (GH#3058) Xander Johnson
Fixes a metadata bug with store’s return_stored option (GH#3064) John A Kirkham
Fix a bug in optimization.fuse_slice to properly handle when first input is None (GH#3076) James Bourbeau
Support arrays with unknown chunk sizes in percentile (GH#3107) Matthew Rocklin
Tokenize scipy.sparse arrays and np.matrix (GH#3060) Roman Yurchak

DataFrame¶

Support month timedeltas in repartition(freq=…) (GH#3110) Matthew Rocklin
Avoid mutation in dataframe groupby tests (GH#3118) Matthew Rocklin
read_csv, read_table, and read_parquet accept iterables of paths (GH#3124) Jim Crist
Deprecates the dd.to_delayed function in favor of the existing method (GH#3126) Jim Crist
Return dask.arrays from df.map_partitions calls when the UDF returns a numpy array (GH#3147) Matthew Rocklin
Change handling of columns and index in dd.read_parquet to be more consistent, especially in handling of multi-indices (GH#3149) Jim Crist
fastparquet append=True allowed to create new dataset (GH#3097) Martin Durant
dtype rationalization for sql queries (GH#3100) Martin Durant

Bag¶

Document bag.map_paritions function may receive either a list or generator. (GH#3150) Nir

Core¶

Change default task ordering to prefer nodes with few dependents and then many downstream dependencies (GH#3056) Matthew Rocklin
Add color= option to visualize to color by task order (GH#3057) (GH#3122) Matthew Rocklin
Deprecate dask.bytes.open_text_files (GH#3077) Jim Crist
Remove short-circuit hdfs reads handling due to maintenance costs. May be re-added in a more robust manner later (GH#3079) Jim Crist
Add dask.base.optimize for optimizing multiple collections without computing. (GH#3071) Jim Crist
Rename dask.optimize module to dask.optimization (GH#3071) Jim Crist
Change task ordering to do a full traversal (GH#3066) Matthew Rocklin
Adds an optimize_graph keyword to all to_delayed methods to allow controlling whether optimizations occur on conversion. (GH#3126) Jim Crist
Support using pyarrow for hdfs integration (GH#3123) Jim Crist
Move HDFS integration and tests into dask repo (GH#3083) Jim Crist
Remove write_bytes (GH#3116) Jim Crist

0.16.1 / 2018-01-09¶

Array¶

Fix handling of scalar percentile values in percentile (GH#3021) James Bourbeau
Prevent bool() coercion from calling compute (GH#2958) Albert DeFusco
Add matmul (GH#2904) John A Kirkham
Support N-D arrays with matmul (GH#2909) John A Kirkham
Add vdot (GH#2910) John A Kirkham
Explicit chunks argument for broadcast_to (GH#2943) Stephan Hoyer
Add meshgrid (GH#2938) John A Kirkham and (GH#3001) Markus Gonser
Preserve singleton chunks in fftshift/ifftshift (GH#2733) John A Kirkham
Fix handling of negative indexes in vindex and raise errors for out of bounds indexes (GH#2967) Stephan Hoyer
Add flip, flipud, fliplr (GH#2954) John A Kirkham
Add float_power ufunc (GH#2962) (GH#2969) John A Kirkham
Compatability for changes to structured arrays in the upcoming NumPy 1.14 release (GH#2964) Tom Augspurger
Add block (GH#2650) John A Kirkham
Add frompyfunc (GH#3030) Jim Crist
Add the return_stored option to store for chaining stored results (GH#2980) John A Kirkham

DataFrame¶

Fixed naming bug in cumulative aggregations (GH#3037) Martijn Arts
Fixed dd.read_csv when names is given but header is not set to None (GH#2976) Martijn Arts
Fixed dd.read_csv so that passing instances of CategoricalDtype in dtype will result in known categoricals (GH#2997) Tom Augspurger
Prevent bool() coercion from calling compute (GH#2958) Albert DeFusco
DataFrame.read_sql() (GH#2928) to an empty database tables returns an empty dask dataframe Apostolos Vlachopoulos
Compatability for reading Parquet files written by PyArrow 0.8.0 (GH#2973) Tom Augspurger
Correctly handle the column name (df.columns.name) when reading in dd.read_parquet (GH#2973) Tom Augspurger
Fixed dd.concat losing the index dtype when the data contained a categorical (GH#2932) Tom Augspurger
Add dd.Series.rename (GH#3027) Jim Crist
DataFrame.merge() now supports merging on a combination of columns and the index (GH#2960) Jon Mease
Removed the deprecated dd.rolling* methods, in preparation for their removal in the next pandas release (GH#2995) Tom Augspurger
Fix metadata inference bug in which single-partition series were mistakenly special cased (GH#3035) Jim Crist
Add support for Series.str.cat (GH#3028) Jim Crist

Core¶

Improve 32-bit compatibility (GH#2937) Matthew Rocklin
Change task prioritization to avoid upwards branching (GH#3017) Matthew Rocklin

0.16.0 / 2017-11-17¶

This is a major release. It includes breaking changes, new protocols, and a large number of bug fixes.

Array¶

Add atleast_1d, atleast_2d, and atleast_3d (GH#2760) (GH#2765) John A Kirkham
Add allclose (GH#2771) by John A Kirkham
Remove random.different_seeds from Dask Array API docs (GH#2772) John A Kirkham
Deprecate vnorm in favor of dask.array.linalg.norm (GH#2773) John A Kirkham
Reimplement unique to be lazy (GH#2775) John A Kirkham
Support broadcasting of Dask Arrays with 0-length dimensions (GH#2784) John A Kirkham
Add asarray and asanyarray to Dask Array API docs (GH#2787) James Bourbeau
Support unique’s return_* arguments (GH#2779) John A Kirkham
Simplify _unique_internal (GH#2850) (GH#2855) John A Kirkham
Avoid removing some getter calls in array optimizations (GH#2826) Jim Crist

DataFrame¶

Support pyarrow in dd.to_parquet (GH#2868) Jim Crist
Fixed DataFrame.quantile and Series.quantile returning nan when missing values are present (GH#2791) Tom Augspurger
Fixed DataFrame.quantile losing the result .name when q is a scalar (GH#2791) Tom Augspurger
Fixed dd.concat return a dask.Dataframe when concatenating a single series along the columns, matching pandas’ behavior (GH#2800) James Munroe
Fixed default inplace parameter for DataFrame.eval to match the pandas defualt for pandas >= 0.21.0 (GH#2838) Tom Augspurger
Fix exception when calling DataFrame.set_index on text column where one of the partitions was empty (GH#2831) Jesse Vogt
Do not raise exception when calling DataFrame.set_index on empty dataframe (GH#2827) Jesse Vogt
Fixed bug in Dataframe.fillna when filling with a Series value (GH#2810) Tom Augspurger
Deprecate old argument ordering in dd.to_parquet to better match convention of putting the dataframe first (GH#2867) Jim Crist
df.astype(categorical_dtype -> known categoricals (GH#2835) Jim Crist
Test against Pandas release candidate (GH#2814) Tom Augspurger
Add more tests for read_parquet(engine=’pyarrow’) (GH#2822) Uwe Korn
Remove unnecessary map_partitions in aggregate (GH#2712) Christopher Prohm
Fix bug calling sample on empty partitions (GH#2818) @xwang777
Error nicely when parsing dates in read_csv (GH#2863) Jim Crist
Cleanup handling of passing filesystem objects to PyArrow readers (GH#2527) @fjetter
Support repartitioning even if there are no divisions (GH#2873) @Ced4
Support reading/writing to hdfs using pyarrow in dd.to_parquet (GH#2894, GH#2881) Jim Crist

Core¶

Allow tuples as sharedict keys (GH#2763) Matthew Rocklin
Calling compute within a dask.distributed task defaults to distributed scheduler (GH#2762) Matthew Rocklin
Auto-import gcsfs when gcs:// protocol is used (GH#2776) Matthew Rocklin
Fully remove dask.async module, use dask.local instead (GH#2828) Thomas Caswell
Compatability with bokeh 0.12.10 (GH#2844) Tom Augspurger
Reduce test memory usage (GH#2782) Jim Crist
Add Dask collection interface (GH#2748) Jim Crist
Update Dask collection interface during XArray integration (GH#2847) Matthew Rocklin
Close resource profiler process on __exit__ (GH#2871) Jim Crist
Fix S3 tests (GH#2875) Jim Crist
Fix port for bokeh dashboard in docs (GH#2889) Ian Hopkinson
Wrap Dask filesystems for PyArrow compatibility (GH#2881) Jim Crist

0.15.4 / 2017-10-06¶

Array¶

da.random.choice now works with array arguments (GH#2781)
Support indexing in arrays with np.int (fixes regression) (GH#2719)
Handle zero dimension with rechunking (GH#2747)
Support -1 as an alias for “size of the dimension” in chunks (GH#2749)
Call mkdir in array.to_npy_stack (GH#2709)

DataFrame¶

Added the .str accessor to Categoricals with string categories (GH#2743)
Support int96 (spark) datetimes in parquet writer (GH#2711)
Pass on file scheme to fastparquet (GH#2714)
Support Pandas 0.21 (GH#2737)

Bag¶

Add tree reduction support for foldby (GH#2710)

Core¶

Drop s3fs from pip install dask[complete] (GH#2750)

0.15.3 / 2017-09-24¶

Array¶

Add masked arrays (GH#2301)
Add *_like array creation functions (GH#2640)
Indexing with unsigned integer array (GH#2647)
Improved slicing with boolean arrays of different dimensions (GH#2658)
Support literals in top and atop (GH#2661)
Optional axis argument in cumulative functions (GH#2664)
Improve tests on scalars with assert_eq (GH#2681)
Fix norm keepdims (GH#2683)
Add ptp (GH#2691)
Add apply_along_axis (GH#2690) and apply_over_axes (GH#2702)

DataFrame¶

Added Series.str[index] (GH#2634)
Allow the groupby by param to handle columns and index levels (GH#2636)
DataFrame.to_csv and Bag.to_textfiles now return the filenames to

which they have written (GH#2655)
Fix combination of partition_on and append in to_parquet (GH#2645)
Fix for parquet file schemes (GH#2667)
Repartition works with mixed categoricals (GH#2676)

Core¶

python setup.py test now runs tests (GH#2641)
Added new cheatsheet (GH#2649)
Remove resize tool in Bokeh plots (GH#2688)

0.15.2 / 2017-08-25¶

Array¶

Remove spurious keys from map_overlap graph (GH#2520)
where works with non-bool condition and scalar values (GH#2543) (GH#2549)
Improve compress (GH#2541) (GH#2545) (GH#2555)
Add argwhere, _nonzero, and where(cond) (GH#2539)
Generalize vindex in dask.array to handle multi-dimensional indices (GH#2573)
Add choose method (GH#2584)
Split code into reorganized files (GH#2595)
Add linalg.norm (GH#2597)
Add diff, ediff1d (GH#2607), (GH#2609)
Improve dtype inference and reflection (GH#2571)

Bag¶

Remove deprecated Bag behaviors (GH#2525)

DataFrame¶

Support callables in assign (GH#2513)
better error messages for read_csv (GH#2522)
Add dd.to_timedelta (GH#2523)
Verify metadata in from_delayed (GH#2534) (GH#2591)
Add DataFrame.isin (GH#2558)
Read_hdf supports iterables of files (GH#2547)

Core¶

Remove bare except: blocks everywhere (GH#2590)

0.15.1 / 2017-07-08¶

Add storage_options to to_textfiles and to_csv (GH#2466)
Rechunk and simplify rfftfreq (GH#2473), (GH#2475)
Better support ndarray subclasses (GH#2486)
Import star in dask.distributed (GH#2503)
Threadsafe cache handling with tokenization (GH#2511)

0.15.0 / 2017-06-09¶

Array¶

Add dask.array.stats submodule (GH#2269)
Support ufunc.outer (GH#2345)
Optimize fancy indexing by reducing graph overhead (GH#2333) (GH#2394)
Faster array tokenization using alternative hashes (GH#2377)
Added the matmul @ operator (GH#2349)
Improved coverage of the numpy.fft module (GH#2320) (GH#2322) (GH#2327) (GH#2323)
Support NumPy’s __array_ufunc__ protocol (GH#2438)

Bag¶

Fix bug where reductions on bags with no partitions would fail (GH#2324)
Add broadcasting and variadic db.map top-level function. Also remove auto-expansion of tuples as map arguments (GH#2339)
Rename Bag.concat to Bag.flatten (GH#2402)

DataFrame¶

Parquet improvements (GH#2277) (GH#2422)

Core¶

Move dask.async module to dask.local (GH#2318)
Support callbacks with nested scheduler calls (GH#2397)
Support pathlib.Path objects as uris (GH#2310)

0.14.3 / 2017-05-05¶

DataFrame¶

Pandas 0.20.0 support

0.14.2 / 2017-05-03¶

Array¶

Add da.indices (GH#2268), da.tile (GH#2153), da.roll (GH#2135)
Simultaneously support drop_axis and new_axis in da.map_blocks (GH#2264)
Rechunk and concatenate work with unknown chunksizes (GH#2235) and (GH#2251)
Support non-numpy container arrays, notably sparse arrays (GH#2234)
Tensordot contracts over multiple axes (GH#2186)
Allow delayed targets in da.store (GH#2181)
Support interactions against lists and tuples (GH#2148)
Constructor plugins for debugging (GH#2142)
Multi-dimensional FFTs (single chunk) (GH#2116)

Bag¶

to_dataframe enforces consistent types (GH#2199)

DataFrame¶

Set_index always fully sorts the index (GH#2290)
Support compatibility with pandas 0.20.0 (GH#2249), (GH#2248), and (GH#2246)
Support Arrow Parquet reader (GH#2223)
Time-based rolling windows (GH#2198)
Repartition can now create more partitions, not just less (GH#2168)

Core¶

Always use absolute paths when on POSIX file system (GH#2263)
Support user provided graph optimizations (GH#2219)
Refactor path handling (GH#2207)
Improve fusion performance (GH#2129), (GH#2131), and (GH#2112)

0.14.1 / 2017-03-22¶

Array¶

Micro-optimize optimizations (GH#2058)
Change slicing optimizations to avoid fusing raw numpy arrays (GH#2075) (GH#2080)
Dask.array operations now work on numpy arrays (GH#2079)
Reshape now works in a much broader set of cases (GH#2089)
Support deepcopy python protocol (GH#2090)
Allow user-provided FFT implementations in da.fft (GH#2093)

DataFrame¶

Fix to_parquet with empty partitions (GH#2020)
Optional npartitions='auto' mode in set_index (GH#2025)
Optimize shuffle performance (GH#2032)
Support efficient repartitioning along time windows like repartition(freq='12h') (GH#2059)
Improve speed of categorize (GH#2010)
Support single-row dataframe arithmetic (GH#2085)
Automatically avoid shuffle when setting index with a sorted column (GH#2091)
Improve handling of integer-na handling in read_csv (GH#2098)

Delayed¶

Repeated attribute access on delayed objects uses the same key (GH#2084)

Core¶

Improve naming of nodes in dot visuals to avoid generic apply (GH#2070)
Ensure that worker processes have different random seeds (GH#2094)

0.14.0 / 2017-02-24¶

Array¶

Fix corner cases with zero shape and misaligned values in arange (GH#1902), (GH#1904), (GH#1935), (GH#1955), (GH#1956)
Improve concatenation efficiency (GH#1923)
Avoid hashing in from_array if name is provided (GH#1972)

Bag¶

Repartition can now increase number of partitions (GH#1934)
Fix bugs in some reductions with empty partitions (GH#1939), (GH#1950), (GH#1953)

DataFrame¶

Support non-uniform categoricals (GH#1877), (GH#1930)
Groupby cumulative reductions (GH#1909)
DataFrame.loc indexing now supports lists (GH#1913)
Improve multi-level groupbys (GH#1914)
Improved HTML and string repr for DataFrames (GH#1637)
Parquet append (GH#1940)
Add dd.demo.daily_stock function for teaching (GH#1992)

Delayed¶

Add traverse= keyword to delayed to optionally avoid traversing nested data structures (GH#1899)
Support Futures in from_delayed functions (GH#1961)
Improve serialization of decorated delayed functions (GH#1969)

Core¶

Improve windows path parsing in corner cases (GH#1910)
Rename tasks when fusing (GH#1919)
Add top level persist function (GH#1927)
Propagate errors= keyword in byte handling (GH#1954)
Dask.compute traverses Python collections (GH#1975)
Structural sharing between graphs in dask.array and dask.delayed (GH#1985)

0.13.0 / 2017-01-02¶

Array¶

Mandatory dtypes on dask.array. All operations maintain dtype information and UDF functions like map_blocks now require a dtype= keyword if it can not be inferred. (GH#1755)
Support arrays without known shapes, such as arises when slicing arrays with arrays or converting dataframes to arrays (GH#1838)
Support mutation by setting one array with another (GH#1840)
Tree reductions for covariance and correlations. (GH#1758)
Add SerializableLock for better use with distributed scheduling (GH#1766)
Improved atop support (GH#1800)
Rechunk optimization (GH#1737), (GH#1827)

Bag¶

Avoid wrong results when recomputing the same groupby twice (GH#1867)

DataFrame¶

Add map_overlap for custom rolling operations (GH#1769)
Add shift (GH#1773)
Add Parquet support (GH#1782) (GH#1792) (GH#1810), (GH#1843), (GH#1859), (GH#1863)
Add missing methods combine, abs, autocorr, sem, nsmallest, first, last, prod, (GH#1787)
Approximate nunique (GH#1807), (GH#1824)
Reductions with multiple output partitions (for operations like drop_duplicates) (GH#1808), (GH#1823) (GH#1828)
Add delitem and copy to DataFrames, increasing mutation support (GH#1858)

Delayed¶

Changed behaviour for delayed(nout=0) and delayed(nout=1): delayed(nout=1) does not default to out=None anymore, and delayed(nout=0) is also enabled. I.e. functions with return tuples of length 1 or 0 can be handled correctly. This is especially handy, if functions with a variable amount of outputs are wrapped by delayed. E.g. a trivial example: delayed(lambda *args: args, nout=len(vals))(*vals)

Core¶

Refactor core byte ingest (GH#1768), (GH#1774)
Improve import time (GH#1833)

0.12.0 / 2016-11-03¶

DataFrame¶

Return a series when functions given to dataframe.map_partitions return scalars (GH#1515)
Fix type size inference for series (GH#1513)
dataframe.DataFrame.categorize no longer includes missing values in the categories. This is for compatibility with a pandas change (GH#1565)
Fix head parser error in dataframe.read_csv when some lines have quotes (GH#1495)
Add dataframe.reduction and series.reduction methods to apply generic row-wise reduction to dataframes and series (GH#1483)
Add dataframe.select_dtypes, which mirrors the pandas method (GH#1556)
dataframe.read_hdf now supports reading Series (GH#1564)
Support Pandas 0.19.0 (GH#1540)
Implement select_dtypes (GH#1556)
String accessor works with indexes (GH#1561)
Add pipe method to dask.dataframe (GH#1567)
Add indicator keyword to merge (GH#1575)
Support Series in read_hdf (GH#1575)
Support Categories with missing values (GH#1578)
Support inplace operators like df.x += 1 (GH#1585)
Str accessor passes through args and kwargs (GH#1621)
Improved groupby support for single-machine multiprocessing scheduler (GH#1625)
Tree reductions (GH#1663)
Pivot tables (GH#1665)
Add clip (GH#1667), align (GH#1668), combine_first (GH#1725), and any/all (GH#1724)
Improved handling of divisions on dask-pandas merges (GH#1666)
Add groupby.aggregate method (GH#1678)
Add dd.read_table function (GH#1682)
Improve support for multi-level columns (GH#1697) (GH#1712)
Support 2d indexing in loc (GH#1726)
Extend resample to include DataFrames (GH#1741)
Support dask.array ufuncs on dask.dataframe objects (GH#1669)

Array¶

Add information about how dask.array chunks argument work (GH#1504)
Fix field access with non-scalar fields in dask.array (GH#1484)
Add concatenate= keyword to atop to concatenate chunks of contracted dimensions
Optimized slicing performance (GH#1539) (GH#1731)
Extend atop with a concatenate= (GH#1609) new_axes= (GH#1612) and adjust_chunks= (GH#1716) keywords
Add clip (GH#1610) swapaxes (GH#1611) round (GH#1708) repeat
Automatically align chunks in atop-backed operations (GH#1644)
Cull dask.arrays on slicing (GH#1709)

Bag¶

Fix issue with callables in bag.from_sequence being interpreted as tasks (GH#1491)
Avoid non-lazy memory use in reductions (GH#1747)

Administration¶

Added changelog (GH#1526)
Create new threadpool when operating from thread (GH#1487)
Unify example documentation pages into one (GH#1520)
Add versioneer for git-commit based versions (GH#1569)
Pass through node_attr and edge_attr keywords in dot visualization (GH#1614)
Add continuous testing for Windows with Appveyor (GH#1648)
Remove use of multiprocessing.Manager (GH#1653)
Add global optimizations keyword to compute (GH#1675)
Micro-optimize get_dependencies (GH#1722)

0.11.0 / 2016-08-24¶

Major Points¶

DataFrames now enforce knowing full metadata (columns, dtypes) everywhere. Previously we would operate in an ambiguous state when functions lost dtype information (such as apply). Now all dataframes always know their dtypes and raise errors asking for information if they are unable to infer (which they usually can). Some internal attributes like _pd and _pd_nonempty have been moved.

The internals of the distributed scheduler have been refactored to transition tasks between explicit states. This improves resilience, reasoning about scheduling, plugin operation, and logging. It also makes the scheduler code easier to understand for newcomers.

Breaking Changes¶

The distributed.s3 and distributed.hdfs namespaces are gone. Use protocols in normal methods like read_text('s3://...' instead.
Dask.array.reshape now errs in some cases where previously it would have create a very large number of tasks

0.10.2 / 2016-07-27¶

More Dataframe shuffles now work in distributed settings, ranging from setting-index to hash joins, to sorted joins and groupbys.
Dask passes the full test suite when run when under in Python’s optimized-OO mode.
On-disk shuffles were found to produce wrong results in some highly-concurrent situations, especially on Windows. This has been resolved by a fix to the partd library.
Fixed a growth of open file descriptors that occurred under large data communications
Support ports in the --bokeh-whitelist option ot dask-scheduler to better routing of web interface messages behind non-trivial network settings
Some improvements to resilience to worker failure (though other known failures persist)
You can now start an IPython kernel on any worker for improved debugging and analysis
Improvements to dask.dataframe.read_hdf, especially when reading from multiple files and docs

0.10.0 / 2016-06-13¶

Major Changes¶

This version drops support for Python 2.6
Conda packages are built and served from conda-forge
The dask.distributed executables have been renamed from dfoo to dask-foo. For example dscheduler is renamed to dask-scheduler
Both Bag and DataFrame include a preliminary distributed shuffle.

Bag¶

Add task-based shuffle for distributed groupbys
Add accumulate for cumulative reductions

DataFrame¶

Add a task-based shuffle suitable for distributed joins, groupby-applys, and set_index operations. The single-machine shuffle remains untouched (and much more efficient.)
Add support for new Pandas rolling API with improved communication performance on distributed systems.
Add groupby.std/var
Pass through S3/HDFS storage options in read_csv
Improve categorical partitioning
Add eval, info, isnull, notnull for dataframes

Distributed¶

Rename executables like dscheduler to dask-scheduler
Improve scheduler performance in the many-fast-tasks case (important for shuffling)
Improve work stealing to be aware of expected function run-times and data sizes. The drastically increases the breadth of algorithms that can be efficiently run on the distributed scheduler without significant user expertise.
Support maximum buffer sizes in streaming queues
Improve Windows support when using the Bokeh diagnostic web interface
Support compression of very-large-bytestrings in protocol
Support clean cancellation of submitted futures in Joblib interface

Other¶

All dask-related projects (dask, distributed, s3fs, hdfs, partd) are now building conda packages on conda-forge.
Change credential handling in s3fs to only pass around delegated credentials if explicitly given secret/key. The default now is to rely on managed environments. This can be changed back by explicitly providing a keyword argument. Anonymous mode must be explicitly declared if desired.

0.9.0 / 2016-05-11¶

API Changes¶

dask.do and dask.value have been renamed to dask.delayed
dask.bag.from_filenames has been renamed to dask.bag.read_text
All S3/HDFS data ingest functions like db.from_s3 or distributed.s3.read_csv have been moved into the plain read_text, read_csv functions, which now support protocols, like dd.read_csv('s3://bucket/keys*.csv')

Array¶

Add support for scipy.LinearOperator
Improve optional locking to on-disk data structures
Change rechunk to expose the intermediate chunks

Bag¶

Rename from_filenames to read_text
Remove from_s3 in favor of read_text('s3://...')

DataFrame¶

Fixed numerical stability issue for correlation and covariance
Allow no-hash from_pandas for speedy round-trips to and from-pandas objects
Generally reengineered read_csv to be more in line with Pandas behavior
Support fast set_index operations for sorted columns

Delayed¶

Rename do/value to delayed
Rename to/from_imperative to to/from_delayed

Distributed¶

Move s3 and hdfs functionality into the dask repository
Adaptively oversubscribe workers for very fast tasks
Improve PyPy support
Improve work stealing for unbalanced workers
Scatter data efficiently with tree-scatters

Other¶

Add lzma/xz compression support
Raise a warning when trying to split unsplittable compression types, like gzip or bz2
Improve hashing for single-machine shuffle operations
Add new callback method for start state
General performance tuning

0.8.1 / 2016-03-11¶

Array¶

Bugfix for range slicing that could periodically lead to incorrect results.
Improved support and resiliency of arg reductions (argmin, argmax, etc.)

Bag¶

Add zip function

DataFrame¶

Add corr and cov functions
Add melt function
Bugfixes for io to bcolz and hdf5

0.8.0 / 2016-02-20¶

Array¶

Changed default array reduction split from 32 to 4
Linear algebra, tril, triu, LU, inv, cholesky, solve, solve_triangular, eye, lstsq, diag, corrcoef.

Bag¶

Add tree reductions
Add range function
drop from_hdfs function (better functionality now exists in hdfs3 and distributed projects)

DataFrame¶

Refactor dask.dataframe to include a full empty pandas dataframe as metadata. Drop the .columns attribute on Series
Add Series categorical accessor, series.nunique, drop the .columns attribute for series.
read_csv fixes (multi-column parse_dates, integer column names, etc. )
Internal changes to improve graph serialization

Other¶

Documentation updates
Add from_imperative and to_imperative functions for all collections
Aesthetic changes to profiler plots
Moved the dask project to a new dask organization

0.7.6 / 2016-01-05¶

Array¶

Improve thread safety
Tree reductions
Add view, compress, hstack, dstack, vstack methods
map_blocks can now remove and add dimensions

DataFrame¶

Improve thread safety
Extend sampling to include replacement options

Imperative¶

Removed optimization passes that fused results.

Core¶

Removed dask.distributed
Improved performance of blocked file reading
Serialization improvements
Test Python 3.5

0.7.4 / 2015-10-23¶

This was mostly a bugfix release. Some notable changes:

Fix minor bugs associated with the release of numpy 1.10 and pandas 0.17
Fixed a bug with random number generation that would cause repeated blocks due to the birthday paradox
Use locks in dask.dataframe.read_hdf by default to avoid concurrency issues
Change dask.get to point to dask.async.get_sync by default
Allow visualization functions to accept general graphviz graph options like rankdir=’LR’
Add reshape and ravel to dask.array
Support the creation of dask.arrays from dask.imperative objects

Deprecation¶

This release also includes a deprecation warning for dask.distributed, which will be removed in the next version.

Future development in distributed computing for dask is happening here: https://distributed.dask.org . General feedback on that project is most welcome from this community.

0.7.3 / 2015-09-25¶

Diagnostics¶

A utility for profiling memory and cpu usage has been added to the dask.diagnostics module.

DataFrame¶

This release improves coverage of the pandas API. Among other things it includes nunique, nlargest, quantile. Fixes encoding issues with reading non-ascii csv files. Performance improvements and bug fixes with resample. More flexible read_hdf with globbing. And many more. Various bug fixes in dask.imperative and dask.bag.

0.7.0 / 2015-08-15¶

DataFrame¶

This release includes significant bugfixes and alignment with the Pandas API. This has resulted both from use and from recent involvement by Pandas core developers.

New operations: query, rolling operations, drop
Improved operations: quantiles, arithmetic on full dataframes, dropna, constructor logic, merge/join, elemwise operations, groupby aggregations

Bag¶

Fixed a bug in fold where with a null default argument

Array¶

New operations: da.fft module, da.image.imread

Infrastructure¶

The array and dataframe collections create graphs with deterministic keys. These tend to be longer (hash strings) but should be consistent between computations. This will be useful for caching in the future.
All collections (Array, Bag, DataFrame) inherit from common subclass

0.6.1 / 2015-07-23¶

Distributed¶

Improved (though not yet sufficient) resiliency for dask.distributed when workers die

DataFrame¶

Improved writing to various formats, including to_hdf, to_castra, and to_csv
Improved creation of dask DataFrames from dask Arrays and Bags
Improved support for categoricals and various other methods

Array¶

Various bug fixes
Histogram function

Scheduling¶

Added tie-breaking ordering of tasks within parallel workloads to better handle and clear intermediate results

Other¶

Added the dask.do function for explicit construction of graphs with normal python code
Traded pydot for graphviz library for graph printing to support Python3
There is also a gitter chat room and a stackoverflow tag