preprocessing

ColumnDeduplicator	ColumnDeduplicator (CDT) is a scikit-style transformer that removes duplicate columns from data, leaving behind one column out of a set of duplicate columns.
InterceptManager	A scikit-style transformer that identifies and manages the constant columns in a dataset.
MinCountTransformer	Remove examples that contain values whose frequencies within their respective feature fall below the specified count threshold.
NanStandardizer	Convert all nan-like representations in a dataset to the same value.
SlimPolyFeatures	SlimPolyFeatures (SPF) performs a polynomial feature expansion on a dataset, where any feature produced that is a column of constants or is a duplicate of another column is omitted from the final output.