test_sample.py issues on clean head

stacktrace.txt

(pid=92848) 2021-08-10 14:39:51,119	ERROR function_manager.py:505 -- Failed to load actor class ImplicitFunc.
(pid=92848) Traceback (most recent call last):
(pid=92848)   File "/Users/xwjiang/ray/python/ray/_private/function_manager.py", line 503, in _load_actor_class_from_gcs
(pid=92848)     actor_class = pickle.loads(pickled_class)
(pid=92848) ModuleNotFoundError: No module named 'test_sample'
(pid=92848) 2021-08-10 14:39:51,121	ERROR worker.py:428 -- Exception raised in creation task: The actor died because of an error raised in its creation task, ray::ImplicitFunc.__init__() (pid=92848, ip=10.0.0.111)
(pid=92848)   File "python/ray/_raylet.pyx", line 531, in ray._raylet.execute_task
(pid=92848)     with ray.worker._changeproctitle(title, next_title):
(pid=92848)   File "python/ray/_raylet.pyx", line 535, in ray._raylet.execute_task
(pid=92848)     outputs = function_executor(*args, **kwargs)
(pid=92848)   File "python/ray/_raylet.pyx", line 485, in ray._raylet.execute_task.function_executor
(pid=92848)     return function(actor, *arguments, **kwarguments)
(pid=92848)   File "/Users/xwjiang/ray/python/ray/_private/function_manager.py", line 563, in actor_method_executor
(pid=92848)     return method(__ray_actor, *args, **kwargs)
(pid=92848)   File "/Users/xwjiang/ray/python/ray/_private/function_manager.py", line 468, in temporary_actor_method
(pid=92848)     raise RuntimeError(f"The actor with name {actor_class_name} "
(pid=92848) RuntimeError: The actor with name ImplicitFunc failed to be imported, and so cannot execute this method.