code: def constant_value(pred):
      """Return the bool value for `pred`, or None if `pred` had a dynamic value.
  
      Args:
        pred: A scalar, either a Python bool or a TensorFlow boolean variable
          or tensor, or the Python integer 1 or 0.
  
      Returns:
        True or False if `pred` has a constant boolean value, None otherwise.
  
      Raises:
        TypeError: If `pred` is not a Variable, Tensor or bool, or Python
          integer 1 or 0.
      """
      # Allow integer booleans.
      if isinstance(pred, int):
          if pred == 1:
              pred = True
          elif pred == 0:
              pred = False
  
      if isinstance(pred, variables.Variable):
          return None
      return smart_module.smart_constant_value(pred)
  
file_path: tensorflow-upstream/tensorflow/python/layers/utils.py
imports: from tensorflow.python.framework import smart_cond
  from tensorflow.python.ops import cond
  from tensorflow.python.ops import variables
label_desc: Use image node_id 9 for calling a global function with example usage: constant_value(pred) and returns: smart_module, None