class_docstr: A phase that simply relays train and eval datasets.
code: def get_train_dataset(self) -> tf.data.Dataset:
      return self._train_dataset
  
file_path: adanet/adanet/experimental/phases/input_phase.py
imports: from typing import Optional
  from adanet.experimental.phases.phase import DatasetProvider
  from adanet.experimental.phases.phase import Phase
  import tensorflow.compat.v2
label_desc: Use image node_id 2 for calling the InputPhase obj's underlying member method code with example usage: obj.get_train_dataset() and returns: self