v0.7.0a6

This is the release notes of v0.7.0a6. See here for the complete list of solved issues and merged PRs.

New Features

• DataFrame
  • Implements Index.__getitem__ (#1971)
  • Implements {DataFrame,Series}.sample (#1983)
  • Implements DataFrameGroupBy.sample (#1994)
• Tensor
  • Implements stats.chisquare (#1974)
  • Implement ttests and gamma functions (#1986)

Project Galois

• Oscar
  • [oscar] Fix actor promise & add tests (#1958)
  • [oscar] Add communication layer for Mars backend (#1989)
  • [oscar] Implements Mars backend for oscar (#1996)
• Storage
  • [storage][vineyard] Implement storage lib of vineyard backend (#1952, thanks @acezen!)
  • [storage][shared_memory] Add storage backend of multiprocessing.shared_memory (#1969)
  • [storage][cuda] Add cuda backend storage implementation (#1981)
  • [storage][ray] Implements Ray storage (#1992, thanks @fyrestone!)

Enhancements

• Allow wrapping existing models with Mars class constructors (#1956)
• Optimize performance of DataFrame.describe() (#1961)
• Initialize filesystem and aio libs (#1980)

Bug fixes

• Fix MarsDMatrix when input tensor has unknown chunk shape (#1966)
• Fix tensor sorting with empty chunks (#1968)
• Re-enable the from/to vineyard test cases, and set meta for tensor/dataframe properly. (#1967)
• Fix ValueError when reducing tensors with empty chunks (#1978)
• Fix job hang when error message can't be pickled (#1990)
• Fix IndexError in Series.sort_values when some chunk is empty (#1999)
• Fix mars crashes on ray >= 1.2.0 (#1998, thanks @fyrestone!)
• Add errors argument for groupby.sample to ignore errors when group size less than n (#2002)