import tensorflow as tf

      # Imports from meta_graph.
      tf.train.import_meta_graph(filename)
      # Retrieves SAVERS collection. Verifies there are 2 entries.
      savers = tf.get_collection("savers")
      self.assertEqual(2, len(savers))
      # Retrieves saver0. Verifies that new_saver0 can restore v0, but not v1.
