message: error if output-shape is tuple
diff: @@ -2043,6 +2043,9 @@ def atrous_conv2d_transpose(value,
  raise ValueError("output_shape must have shape (4,), got {}".format(
  output_shape_.get_shape()))
  + if isinstance(output_shape, tuple):
  + raise ValueError("output_shape cannot be of type tuple")
  +
  if isinstance(output_shape, (list, np.ndarray)):
  # output_shape's shape should be == [4] if reached this point.
  if not filters.get_shape().dims[2].is_compatible_with(output_shape[3]):
  