docstr: Confirm subscribed identity ops are correctly detected.
docstr_tok: ["Confirm","subscribed","identity","ops","are","correctly","detected","."]
code: def testIsSubscribedIdentity(self):
      """Confirm subscribed identity ops are correctly detected."""
      a = constant_op.constant(1)
      b = constant_op.constant(2)
      c = math_ops.add(a, b)
      idop = array_ops.identity(c)
      c_sub = subscribe.subscribe(c, [])
  
      self.assertFalse(subscribe._is_subscribed_identity(a))
      self.assertFalse(subscribe._is_subscribed_identity(c))
      self.assertFalse(subscribe._is_subscribed_identity(idop))
      self.assertTrue(subscribe._is_subscribed_identity(c_sub))
  
imports: import collections
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import sparse_tensor
  from tensorflow.python.framework import subscribe
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import cond
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import script_ops
  from tensorflow.python.ops import sparse_ops
  from tensorflow.python.ops import tensor_array_ops
  from tensorflow.python.ops import variable_v1
  from tensorflow.python.platform import googletest
label_desc: Use image node_id 5 for calling the SubscribeTest obj's underlying member method code with example usage: obj.testIsSubscribedIdentity() without return types