import tensorflow as tf

          update_ops = tf.get_collection(tf.GraphKeys.UPDATE_OPS, name_scope)
          staging_delta_ops = list(self.variable_mgr.staging_delta_ops)

    if not update_ops:
      update_ops = tf.get_collection(tf.GraphKeys.UPDATE_OPS, name_scope)
    enqueue_ops.append(tf.group(*gpu_copy_stage_ops))
    if self.variable_mgr.supports_staged_vars():
      for staging_ops in self.variable_mgr.staging_vars_on_devices:
