class_docstr: Base class for TF-Agents unit tests.
code: def initialize_v1_variables(self):
      variables = (
          tf.compat.v1.global_variables()
          + tf.compat.v1.local_variables()
      )
      self.evaluate(tf.compat.v1.variables_initializer(variables))
  
file_path: agents/tf_agents/utils/test_utils.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  from absl import flags
  import gin
  import numpy
  import tensorflow
label_desc: Use image node_id 3 for calling the TestCase obj's underlying member method code with example usage: obj.initialize_v1_variables() without return types