code: def _identity(x):
      """Identity op that recognizes `TensorArray`, `Operation`, and `Tensor`."""
      if isinstance(x, tensor_array_ops.TensorArray):
          return x.identity()
      elif isinstance(x, ops.Operation):
          return control_flow_ops.group(x)
      elif context.executing_eagerly() and x is None:
          return None
      else:
          return array_ops.identity(x)
  
imports: import collections
  import contextlib
  import threading
  from tensorflow.python.eager import context
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import ops
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import control_flow_ops
  from tensorflow.python.ops import gen_resource_variable_ops
  from tensorflow.python.ops import tensor_array_ops
  from tensorflow.python.util import nest
  from tensorflow.python.util import object_identity
  from tensorflow.python.util.tf_export import tf_export
label_desc: Use image node_id 1 for calling a global function with example usage: _identity(x) and returns: x, control_flow_ops, None, array_ops