Creates an extractor for extracting transformed features.

The extractor's PTransform loads the saved_model(s) invoking the preprocessing functions against every extract yielding a copy of the incoming extracts with a tfma.TRANSFORMED_FEATURES_KEY containing the output from the preprocessing functions.

eval_config Eval config.
eval_shared_model Shared model (single-model evaluation) or list of shared models (multi-model evaluation).

Extractor for extracting preprocessed features.