get_env_attr not working in SubprocVectorEnv?

[HYB777]

I want to obtain some attributions from my custom environ, when I use DummyVectorEnv, get_env_attr is working.

But for SubprocVectorEnv, it seem not working? It report the following errors:

Process Process-1:
Traceback (most recent call last):
File "/home/hyb/anaconda3/envs/hyb/lib/python3.9/multiprocessing/process.py", line 315, in _bootstrap
self.run()
File "/home/hyb/anaconda3/envs/hyb/lib/python3.9/multiprocessing/process.py", line 108, in run
self._target(*self._args, **self._kwargs)
File "/home/hyb/anaconda3/envs/hyb/lib/python3.9/site-packages/tianshou/env/worker/subproc.py", line 114, in _worker
p.send(getattr(env, data) if hasattr(env, data) else None)
File "/home/hyb/anaconda3/envs/hyb/lib/python3.9/multiprocessing/connection.py", line 211, in send
self._send_bytes(_ForkingPickler.dumps(obj))
File "/home/hyb/anaconda3/envs/hyb/lib/python3.9/multiprocessing/reduction.py", line 51, in dumps
cls(buf, protocol).dump(obj)
AttributeError: Can't pickle local object 'config_valve..'
Traceback (most recent call last):
File "/home/hyb/anaconda3/envs/hyb/lib/python3.9/site-packages/IPython/core/interactiveshell.py", line 3398, in run_code
exec(code_obj, self.user_global_ns, self.user_ns)
File "", line 1, in <cell line: 1>
train_env.get_env_attr('simulator')
File "/home/hyb/anaconda3/envs/hyb/lib/python3.9/site-packages/tianshou/env/venvs.py", line 221, in get_env_attr
return [self.workers[j].get_env_attr(key) for j in id]
File "/home/hyb/anaconda3/envs/hyb/lib/python3.9/site-packages/tianshou/env/venvs.py", line 221, in
return [self.workers[j].get_env_attr(key) for j in id]
File "/home/hyb/anaconda3/envs/hyb/lib/python3.9/site-packages/tianshou/env/worker/subproc.py", line 152, in get_env_attr
return self.parent_remote.recv()
File "/home/hyb/anaconda3/envs/hyb/lib/python3.9/multiprocessing/connection.py", line 255, in recv
buf = self._recv_bytes()
File "/home/hyb/anaconda3/envs/hyb/lib/python3.9/multiprocessing/connection.py", line 419, in _recv_bytes
buf = self._recv(4)
File "/home/hyb/anaconda3/envs/hyb/lib/python3.9/multiprocessing/connection.py", line 388, in _recv
raise EOFError
EOFError

How could I solve it?

[Trinkle23897]

AttributeError: Can't pickle local object 'config_valve..' did you use lambda expression for config_value? Could you provide how you set config_value?

[HYB777]

AttributeError: Can't pickle local object 'config_valve..' did you use lambda expression for config_value? Could you provide how you set config_value?

What does the config_value refer to? If you mean the paramter env_fns in SubprocVectorEnv, I was actually using a lambda expression, as follows:
`

train_env_ = [lambda port=i: get_env(
    problem_config(
        problem=args.problem,
        prefix=args.prefix + '_train_port%d' % port,
        state_dir='state_dir',
        result_dir='result_dir',
        error_dir='error_dir',
        msh_dir='msh_dir',
        max_len=args.max_len,
        penalty=args.penalty,
        phase='train',
        local=args.prefix + '_train_port%d' % port,
        port=port,
    )
) for i in range(2036, 2036 + args.training_num)]

`