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Returns a factory function that creates Iterator[pa.RecordBatch].

examples The Examples artifacts that the TFXIO from which the Dataset is created from is intended to access.
telemetry_descriptors A set of descriptors that identify the component that is instantiating the TFXIO. These will be used to construct the namespace to contain metrics for profiling and are therefore expected to be identifiers of the component itself and not individual instances of source use.