TypeError: can't pickle function objects

[OopsYouDiedE]

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• I have searched the MuZero issues and found no similar bug report.

🐛 Describe the bug

I run the script in both 3.7 and 3.9 and there are same problem.

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(minerl) PS E:\Download\muzero-general-master> python muzero.py

Welcome to MuZero! Here's a list of games:
0. atari

1. breakout
2. cartpole
3. connect4
4. gomoku
5. gridworld
6. lunarlander
7. simple_grid
8. spiel
9. tictactoe
10. twentyone
    Enter a number to choose the game: 2
    2022-10-10 16:33:22,009 INFO worker.py:1518 -- Started a local Ray instance.
    Traceback (most recent call last):
    File "muzero.py", line 650, in
    muzero = MuZero(game_name)
    File "muzero.py", line 96, in init
    ray.init(num_gpus=total_gpus, ignore_reinit_error=True)
    File "C:\Users\zznZZ.conda\envs\minerl\lib\site-packages\ray_private\client_mode_hook.py", line 105, in wrapper
    return func(*args, **kwargs)
    File "C:\Users\zznZZ.conda\envs\minerl\lib\site-packages\ray_private\worker.py", line 1528, in init
    job_config=job_config,
    File "C:\Users\zznZZ.conda\envs\minerl\lib\site-packages\ray_private\worker.py", line 2071, in connect
    lambda worker_info: sys.path.insert(1, script_directory)
    File "C:\Users\zznZZ.conda\envs\minerl\lib\site-packages\ray_private\worker.py", line 709, in run_function_on_all_workers
    pickled_function = pickle.dumps(function)
    File "C:\Users\zznZZ.conda\envs\minerl\lib\site-packages\ray\cloudpickle\cloudpickle_fast.py", line 73, in dumps
    cp.dump(obj)
    File "C:\Users\zznZZ.conda\envs\minerl\lib\site-packages\ray\cloudpickle\cloudpickle_fast.py", line 620, in dump
    return Pickler.dump(self, obj)
    File "C:\Users\zznZZ.conda\envs\minerl\lib\site-packages\ray\pickle5_files\pickle5\pickle.py", line 485, in dump
    self.save(obj)
    File "C:\Users\zznZZ.conda\envs\minerl\lib\site-packages\ray\pickle5_files\pickle5\pickle.py", line 601, in save
    self.save_reduce(obj=obj, *rv)
    File "C:\Users\zznZZ.conda\envs\minerl\lib\site-packages\ray\pickle5_files\pickle5\pickle.py", line 689, in save_reduce
    save(func)
    File "C:\Users\zznZZ.conda\envs\minerl\lib\site-packages\ray\pickle5_files\pickle5\pickle.py", line 601, in save
    self.save_reduce(obj=obj, *rv)
    File "C:\Users\zznZZ.conda\envs\minerl\lib\site-packages\ray\pickle5_files\pickle5\pickle.py", line 689, in save_reduce
    save(func)
    File "C:\Users\zznZZ.conda\envs\minerl\lib\site-packages\ray\pickle5_files\pickle5\pickle.py", line 576, in save
    rv = reduce(self.proto)

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Minimal Reproducible Example

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