message: fixed a bug in convert_image_dtype
  Removed `tf.` from `dtype = tf.dtypes.as_dtype(dtype)`.
diff: @@ -1736,7 +1736,7 @@ def convert_image_dtype(image, dtype, saturate=False, name=None):
  AttributeError: Raises an attribute error when dtype is neither float nor integer
  """
  image = ops.convert_to_tensor(image, name='image')
  - dtype = tf.dtypes.as_dtype(dtype)
  + dtype = dtypes.as_dtype(dtype)
  if not dtype.is_floating and not dtype.is_integer:
  raise AttributeError("dtype must be either floating point or integer")
  if dtype == image.dtype:
  