fut1 result = 1
torch.futures.wait_all(futures)
Waits for all provided futures to be complete, and returns the list
   of completed values. If any of the futures encounters an error, the
   method will exit early and report the error not waiting for other
   futures to complete.
Parameters:
      futures (list) -- a list of "Future" object.
Returns:
      A list of the completed "Future" results. This method will throw
      an error if "wait" on any "Future" throws.
Return type:
      List