import tensorflow as tf

      tf.constant(2, dtype=tf.int32, name="layer_id"),
      inputs,
      prev_c,
      prev_h,
      anchors,
      anchors_w_1,
      arc_seq,
      tf.constant([0.0], dtype=tf.float32, name="entropy"),
      tf.constant([0.0], dtype=tf.float32, name="log_prob"),
    ]
    
    loop_outputs = tf.while_loop(_condition, _body, loop_vars,
                                 parallel_iterations=1)

