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Return columns that are required inputs of TransformDataset.

preprocessing_fn A tf.transform preprocessing_fn.
specs A dict of feature name to tf.TypeSpecs. If force_tf_compat_v1 is True, this can also be feature specifications.
force_tf_compat_v1 (Optional) If True, use Tensorflow in compat.v1 mode. Defaults to False.

A list of columns that are required inputs of the transform tf.Graph defined by preprocessing_fn.