code: def _is_namedtuple(x):
      return isinstance(x, tuple) and isinstance(
          getattr(x, "_fields", None), collections_abc.Sequence
      )
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import collections
  import numbers
  from typing import Optional, Text
  from absl import logging
  import numpy
  from six.moves import zip
  import tensorflow
  from tf_agents.typing import types
  from tf_agents.utils import composite
  import wrapt
  from tensorflow.python.util import nest
label_desc: Use image node_id 6 for calling a global function with example usage: _is_namedtuple(x) and returns: unknown