tfma.extractors.SliceKeyExtractor( slice_spec=None, materialize=True )
Creates an extractor for extracting slice keys.
The incoming Extracts must contain a FeaturesPredictionsLabels extract keyed by tfma.FEATURES_PREDICTIONS_LABELS_KEY. Typically this will be obtained by calling the PredictExtractor.
The extractor's PTransform yields a copy of the Extracts input with an additional extract pointing at the list of SliceKeyType values keyed by tfma.SLICE_KEY_TYPES_KEY. If materialize is True then a materialized version of the slice keys will be added under the key tfma.MATERIALZED_SLICE_KEYS_KEY.
slice_spec: Optional list of SingleSliceSpec specifying the slices to slice the data into. If None, defaults to the overall slice.
materialize: True to add MaterializedColumn entries for the slice keys.
Extractor for slice keys.