import tensorflow as tf

      saver0.save(sess, saver0_ckpt)
      saver1.save(sess, saver1_ckpt)
      # Generates MetaGraphDef.
      meta_graph_def = tf.train.export_meta_graph(filename)
      meta_graph_def0 = saver0.export_meta_graph()
      meta_graph_def1 = saver1.export_meta_graph()
