code: def default_relative_root_tolerance(dtype):
      """Returns the default relative root tolerance used for a TensorFlow dtype."""
      if dtype is None:
          dtype = tf.float64
      return 4 * np.finfo(dtype.as_numpy_dtype(0)).eps
  
label_desc: Use image node_id 1 for calling a global function with example usage: default_relative_root_tolerance(dtype) and returns: unknown