code: def exp2(x: TfExpressionEx) -> TfExpression:
      """Exponent in base 2."""
      with tf.name_scope("Exp2"):
          return tf.exp(x * np.float32(np.log(2.0)))
  
imports: import os
  import numpy
  import tensorflow
  import logging
  import tensorflow.contrib
  from typing import Any, Iterable, List, Union
label_desc: Use image node_id 6 for calling a global function with example usage: exp2(x) and returns: tf