Modin 0.3.0 release notes

This release came with a lot of bugfixes, new features, and performance enhancements. Notably, you can now use Modin out of core to use larger-than-memory DataFrames with a pandas API! We have also set up an easier way to report bugs, simply email bug_reports@modin.org or feature_requests@modin.org to report bugs or request features. Modin also now supports Dask Delayed as a backend!

Bugfixes + Pandas Concordance (🐛 + 🐼)

• Various bugfixes for the python backend (#260, #287, #310)
• Fixes indexing issues with loc, iloc, and __getitem__ (#295, #294)
• __repr__ bugfix (#299)
• Fixed block lengths error (#304)
• Fix reset_index with a MultiIndex resulted in a single column (#305)
• Fix index of the result of get_dtype_counts (#308)
• Fixing bug in read_csv erroneously filtered out provided keyword arguments (#314)
• Fixes mode to work with the new backend (#313)
• Fix bug in concat where keys were improperly assigned (#317)
• Allow Modin to use the larger than target item for setitem (#319)
• Adding dtypes to the exclude parameter in the remote partition (#321)
• Adding additional check to inplace operations (#323)
• Adding modin.pandas.melt for pandas concordance (#325)
• Fixing issue where non-numeric partitions threw errors on numeric ops (#328)
• Adding SeriesView object that allows inplace operations (#326, #331, #354, #357, #373, #375, #390)
• Fix dropna when axis is a string (#329)
• Ensuring ordered retrieval of columns/rows when operating on a subset (#334)
• Adding check for lists of columns with a column not in the index (#336)
• Fixes rmod (#344)
• Fix mode when axis=1 and remove a reindex (#333)
• Fix rfloordiv error (#342)
• Removed pow dtype checking (#346)
• Fix a bug in get_indices (#348)
• Fixed sort_index (#160)
• Setting min_count default to 0 to match pandas (#352)
• Filtering default exclude values in describe based on the include passed in (#363)
• Fixing partitioning issue when doing a reindex/concat (#361)
• Adding try-except block to internal partition computation for describe (#365)
• Adding crosstab that defaults to pandas to modin.pandas (#367)
• Correctly handling empty DataFrames for selective operations (#369)
• Adding case for operations like align so we can properly convert (#371)
• Adding groupby columns and index name when necessary (#380)
• Checking for type before we check the length to avoid spurious errors. (#383)
• Removing data from DataFrame.hist parameter requirements (#387)
• Adding plotting module. (#389)
• Correcting dtypes after iloc issue (#391)
• Adding isnull to modin.pandas (#395)
• Insert column to a DataFrame with no index (#398)
• support for DataFrame().loc when location (row/col) does not exist (#401)
• Adding support for inserting DataFrames with 1 column (#403)
• removing axis from replace signature (#412)
• align read_excel() signature with pandas 0.23.4 (#415)
• Add a fix to Groupby for aggregations by a column from the DataFrame (#413)
• Adding a way to set existing columns using setattr (#423)
• Fixes out of order columns for loc based indexing (#424)

User experience

• Add email addresses for reporting bugs/requesting implementation (#296, #426)

New functionality

• Dask Backend 🎉 (#271, #281, #297)
• Out of Core 🎉 (#277)
• Use ray to parallelize read_feather with pyarrow feather API (#292)

Backend enhancements + Performance

• Using numpy arrays instead of python lists for metadata (#300)
• Improve the way that Modin filters out empty partitions (#301)
• Making Modin more efficient with smaller DataFrames (#307)
• Making drop faster for drop operations (#379)
• Converting PandasQueryCompiler.getitem_array to accept numeric indices (#386)
• Removing is_view from PandasQueryCompilerView and codepath requiring it (#393)
• Making Modin more efficient at small DataFrames (#407)

Code Refactor

• Refactor io module (#283)
• Major refactor of data_management (#290)
• Removing dead code and removing explicit warnings (#302)
• Refactor testing suite (#93)

Ray updated

• Updated Ray dependency to 0.6.2 (#417)

Documentation

• Adding badge to README for link to discourse (#332)
• Add logo to repo (#337, #338, #339, #340)
• Update Readme
• Link to Pandas Documentation (#397)
• Adding out of core information to the documentation (#406)

Contributors this release

The following users contributed code to Modin since the last release.

@coobas (New contributor) 🔰
@pcahyna (New contributor) 🔰
@Kopurlso (Returning contributor) 🌟
@eavidan (Committer)
@osalpekar (Committer)
@williamma12 (Committer)
@devin-petersohn (Admin)

🎉🎉 Thank you! 🎉🎉