message: Update metrics.py
  Please see this issue: for reference.
diff: @@ -3342,6 +3342,8 @@ def categorical_accuracy(y_true, y_pred):
  Returns:
  Categorical accuracy values.
  """
  + assert y_true.shape==y_pred.shape
  +
  return math_ops.cast(
  math_ops.equal(
  math_ops.argmax(y_true, axis=-1), math_ops.argmax(y_pred, axis=-1)),
  