window, must be > 0.
  * **ceil_mode** -- If "True", will use *ceil* instead of *floor*
    to compute the output shape. This ensures that every element
    in the input tensor is covered by a sliding window.

  * **return_indices** -- If "True", will return the argmax along
    with the max values. Useful for
    "torch.nn.functional.max_unpool1d" later
