class_docstr: A hooks that restored variables from a given checkpoints.
  
  Params:
    prefix: Variables matching this prefix are restored.
    checkpoint_path: Path to the checkpoint to restore variables from.
code: def after_create_session(self, session, coord):
      self._saver.restore(session, self.params["checkpoint_path"])
      tf.logging.info("Successfully restored all variables")
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  from __future__ import unicode_literals
  import abc
  import os
  import numpy
  import six
  import yaml
  import tensorflow
  from tensorflow.python.training.basic_session_run_hooks import SecondOrStepTimer
  from tensorflow.python.training import session_manager
  from tensorflow.python.client import timeline
  from tensorflow import gfile
  from seq2seq.configurable import Configurable, abstractstaticmethod
  from seq2seq import graph_utils, global_vars
label_desc: Use image node_id 4 for calling the VariableRestoreHook obj's underlying member method code with example usage: obj.after_create_session(session, coord) without return types