message: Update variables.py
  * Update variables.py
  Added deprecated message
  * Update variables.py
  Declared more functions as deprecated
diff: @@ -37,6 +37,7 @@ from tensorflow.python.platform import tf_logging as logging
  from tensorflow.python.platform import resource_loader
  from tensorflow.python.training import saver as tf_saver
  from tensorflow.python.training import training_util
  +from tensorflow.python.util.deprecation import deprecated
  __all__ = ['add_model_variable',
  @@ -82,7 +83,7 @@ def zero_initializer(ref, use_locking=True, name="zero_initializer"):
  resource_loader.get_path_to_datafile("_variable_ops.so"))
  return gen_variable_ops.zero_initializer(ref, name=name)
  -
  +@deprecated(None, "Please switch to tf.train.assert_global_step")
  def assert_global_step(global_step_tensor):
  training_util.assert_global_step(global_step_tensor)
  @@ -110,11 +111,11 @@ def assert_or_get_global_step(graph=None, global_step_tensor=None):
  assert_global_step(global_step_tensor)
  return global_step_tensor
  -
  +@deprecated(None, "Please switch to tf.train.get_global_step")
  def get_global_step(graph=None):
  return training_util.get_global_step(graph)
  -
  +@deprecated(None, "Please switch to tf.train.create_global_step")
  def create_global_step(graph=None):
  """Create global step tensor in graph.
  @@ -132,7 +133,7 @@ def create_global_step(graph=None):
  """
  return training_util.create_global_step(graph)
  -
  +@deprecated(None, "Please switch to tf.train.get_or_create_global_step")
  def get_or_create_global_step(graph=None):
  """Returns and create (if necessary) the global step tensor.
  