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Creates an extractor for extracting features.

The extractor's PTransform extracts features from an Arrow RecordBatch stored under tfma.ARROW_RECORD_BATCH_KEY in the incoming extract and adds them to the output extract under the key tfma.FEATURES_KEY. Any extracts that already exist will be merged with the values parsed by this extractor with this extractor's values taking precedence when duplicate keys are detected.

eval_config Eval config.

Extractor for extracting features.