code: def _set_timeout(future, timeout):
      if timeout:
  
          def on_timeout():
              future.set_exception(gen.TimeoutError())
  
          io_loop = ioloop.IOLoop.current()
          timeout_handle = io_loop.add_timeout(timeout, on_timeout)
          future.add_done_callback(
              lambda _: io_loop.remove_timeout(timeout_handle)
          )
  
imports: from __future__ import absolute_import, division, print_function
  import collections
  import heapq
  from tornado import gen, ioloop
  from tornado.concurrent import Future
  from tornado.locks import Event
label_desc: Use image node_id 1 for calling a global function with example usage: _set_timeout(future, timeout) without return types