code: def method(*args, **kwargs):
      
      assert len(args) == 0
      assert len(kwargs) == 1
      assert "num_return_vals" in kwargs
      num_return_vals = kwargs["num_return_vals"]
  
      def annotate_method(method):
          method.__ray_num_return_vals__ = num_return_vals
          return method
  
      return annotate_method
docs: Annotate an actor method.
  
      .. code-block:: python
  
          @ray.remote
          class Foo(object):
              @ray.method(num_return_vals=2)
              def bar(self):
                  return 1, 2
  
          f = Foo.remote()
  
          _, _ = f.bar.remote()
  
      Args:
          num_return_vals: The number of object IDs that should be returned by
              invocations of this actor method.