v0.5.0a3

This is the release notes of v0.5.0a3. See here for the complete list of solved issues and merged PRs.

New Features

• DataFrame
  • Add support for {DataFrame,Series,Index}.drop (#1263)
  • Add {DataFrame,Series}.to_sql() and Series.to_csv() (#1264)
  • Implements {DataFrame,Series,Index}.drop_duplicates (#1285)
  • Implements DataFrame.melt (#1284)
  • Implements md.read_sql_query (#1297)
  • Implements {Series,Index}.to_frame() and Index.to_series() (#1317)
  • Support setting columns for DataFrame (#1326)
• Learn
  • Add MarsDistributor for tsfresh library (#1277)
  • Implements mars.learn.model_selection.train_test_split (#1352)
• Remote
  • Support tileables as arguments for spawned functions (#1296)

Enhancements

• Allow client-side to use pickle to serialize / deserialize tensor data (#1289)
• Support create session from environment variables (#1265)

Bug fixes

• Fix NearestNeighbors that run failed in cluster mode (#1262)
• Fix graph hang on tile failure and execution failure (#1272)
• Fix failure when executing None-result spawn functions (#1276)
• Fix shape calculation in TensorIndex for tensor.__setitem__ (#1283)
• Support fuse for Mars Remote (#1287)
• Fix mt.linalg.norm when chunk shape on axis > 1 (#1302)
• Fix error in calc_data_size() for GroupByWrapper (#1307)
• Trigger execution in check_consistent_length when arrays have unknown shape (#1321)
• Fix wrong columns value in reset_index (#1320)
• Fix build_df when input DataFrame has duplicate columns (#1319)
• Remove reliance on WHERE 1=0 in read_sql (#1335)
• Make local filesystem work when PyArrow not installed (#1356)

Documentation

• Add docs for remote API, getting started as well as GPU integration (#1266)
• Use pydata-sphinx-theme for documentation (#1304)

Others

• Use latest pandas wheel for Python 3.8 (#1333)