Preprocessing, subsetting and analyzing features
Pre-process features
| $preprocess() | Create or modify a feature by preprocessing an existing feature |
| $feature_subset() | Similar to using subset, but instead of deleting rows it only sets rows for a specified feature to NA. |
Inspect features
| feature_stats() | Create a data.frame with feature statistics |
| top_features() | Show top features, optionally grouped by a given factor |
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