code: def is_unbound(method):
      """Checks if it is an unbounded method."""
      return not (hasattr(method, "__self__") and method.__self__)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import copy
  import functools
  import inspect
  from absl import logging
  import numpy
  import six
  import tensorflow
  from tf_agents.utils import common
  from tensorflow.python.util import tf_decorator
label_desc: Use image node_id 2 for calling a global function with example usage: is_unbound(method) and returns: unknown