code: def __init__(self, length: int) -> None:
      self._length = length
  
imports: from typing import Tuple
  import numpy
  import pytest
  from tensorflow.keras.utils import Sequence
  import determined
  from determined import keras
  from determined.common import check
  from tests.experiment import tf_utils
label_desc: Use image node_id 1 to create a new IdentitySequence object from inherited base classes: Sequence with example: obj = IdentitySequence(length)