code: def ternary_operation(x):
      """Ternary operation use threshold computed with weights."""
      g = tf.compat.v1.get_default_graph()
      with g.gradient_override_map({"Sign": "Identity"}):
          threshold = _compute_threshold(x)
          x = tf.sign(
              tf.add(
                  tf.sign(tf.add(x, threshold)),
                  tf.sign(tf.add(x, -threshold)),
              )
          )
          return x
  
imports: import numpy
  import tensorflow
  from tensorflow.python.ops.rnn_cell import LSTMStateTuple
  import tensorlayer
  from tensorlayer import logging
  from tensorlayer.decorators import deprecated, deprecated_alias
label_desc: Use image node_id 19 for calling a global function with example usage: ternary_operation(x) and returns: x