code: def test_replace_itself(self):
      with self.test_session():
          x = tf.constant(2.0)
          y = tf.constant(3.0)
          x_new = ed.copy(x, {x: y}, replace_itself=False)
          self.assertEqual(x_new.eval(), 2.0)
          x_new = ed.copy(x, {x: y}, replace_itself=True)
          self.assertEqual(x_new.eval(), 3.0)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import edward
  import numpy
  import tensorflow
  from edward.models import Bernoulli, Categorical, Mixture, Normal
label_desc: Use image node_id 2 for calling the test_copy_class obj's underlying member method code with example usage: obj.test_replace_itself() without return types