dffml
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Adding feature selection operations
Added two new feature selection operations to the dffml.operations.data plugin, select_k_best and select_percentile. These are based entirely on the Sklearn functions:
https://scikit-learn.org/stable/modules/generated/sklearn.feature_selection.SelectKBest
https://scikit-learn.org/stable/modules/generated/sklearn.feature_selection.SelectPercentile.html#sklearn.feature_selection.SelectPercentile
Corresponding unit tests have also been added. This is part of the specifications for the GSOC project: #968.