code: def log2(x: TfExpressionEx) -> TfExpression:
      """Logarithm in base 2."""
      with tf.name_scope("Log2"):
          return tf.log(x) * np.float32(1.0 / 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 5 for calling a global function with example usage: log2(x) and returns: unknown