message: Cleanup the private api usage of math_ops.mul.
diff: @@ -4869,7 +4869,7 @@ def hard_sigmoid(x):
  """
  point_two = _constant_to_tensor(0.2, x.dtype.base_dtype)
  point_five = _constant_to_tensor(0.5, x.dtype.base_dtype)
  - x = math_ops.mul(x, point_two)
  + x = math_ops.multiply(x, point_two)
  x = math_ops.add(x, point_five)
  x = clip_ops.clip_by_value(x, 0., 1.)
  return x
  