API: support sparse data frames

BCG-X-Official / sklearndf

DataFrame support for scikit-learn.

https://bcg-x-official.github.io/sklearndf/

Apache License 2.0

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Closed j-ittner closed 1 year ago

j-ittner commented 1 year ago

allow OneHotEncoderDF to produce sparse data frames
accept pandas series as the X argument of all estimators, as an alternative to data frames
add CountVectorizerDF and TfidfVectorizerDF (both of which expect a series or a single-column data frame as the X argument)
preserve sparse dataframes in ColumnTransformerDF and FeatureUnionDF