code: def test_identity_op_simplify(self):
      expr = (
          "#Identity",
          ("#Mul", ("#Identity", ("#x",)), ("#Identity", (3.7,))),
      )
      did_something, new_expr = identity_op_simplify(expr)
      self.assertTrue(did_something)
      self.assertEqual(new_expr, ("#Mul", ("#x",), (3.7,)))
      did_something, new_expr = power_op_simplify(new_expr)
      self.assertFalse(did_something)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import edward
  import numpy
  import tensorflow
  from edward.inferences.conjugacy.simplify import *
  from edward.inferences.conjugacy.simplify import _mul_n
label_desc: Use image node_id 3 for calling the test_simplify_class obj's underlying member method code with example usage: obj.test_identity_op_simplify() without return types