[question] How to Use --env-kwargs correctly?

How do you use --env-kwargs correctly?

I have this code in a custom environment.

custom_env = gym.make('forex-v0',
               df = FOREX_EURUSD_1H_ASK,
               window_size = 10,
               frame_bound = (10, 300),
               unit_side = 'right')

let us say I want to use the df = FOREX_EURUSD_1H_ASK

–env-kwargs df = FOREX_EURUSD_1H_ASK post an error.

Traceback (most recent call last):
  File "train.py", line 79, in <module>
    args = parser.parse_args()
  File "C:\anaconda\envs\zootesting\lib\argparse.py", line 1755, in parse_args
    args, argv = self.parse_known_args(args, namespace)
  File "C:\anaconda\envs\zootesting\lib\argparse.py", line 1787, in parse_known_args
    namespace, args = self._parse_known_args(args, namespace)
  File "C:\anaconda\envs\zootesting\lib\argparse.py", line 1993, in _parse_known_args
    start_index = consume_optional(start_index)
  File "C:\anaconda\envs\zootesting\lib\argparse.py", line 1933, in consume_optional
    take_action(action, args, option_string)
  File "C:\anaconda\envs\zootesting\lib\argparse.py", line 1861, in take_action
    action(self, namespace, argument_values, option_string)
  File "E:\ML\reinforcementlearning\zoo\rl-baselines-zoo\utils\utils.py", line 394, in __call__
    arg_dict[key] = eval(value)
  File "<string>", line 0

[caburu]

@toksis I believe the problem is yet with the equal sign.

The other command line parameters has only one value. For example: for --algo, in a terminal, you could use --algo=acktr or --algo acktr, and both it would work. But for --env-kwargs you need to pass more than one value, so you can’t use the equal sign.

If you were using a terminal you would only need to replace the equal sign by space character. But this will not work with Visual Studio Code because when there is a space inside the arg, VS code put quotes around the arg. So I believe the solution is to separate the args.

Replace this line:

                     "--sampler=tpe","--pruner=median","--env-kwargs=df:'FOREX_EURUSD_1H_ASK' frame_bound:'(50, 100)' window_size:'10' "]

by this:

                     "--sampler=tpe","--pruner=median","--env-kwargs", "df:'FOREX_EURUSD_1H_ASK'", "frame_bound:'(50, 100)'", "window_size:'10'"]

And tell us if it works.

[toksis]

Thank you for your help @araffin and @caburu cabu. Sorry for the delay, but I did this directly after waking up hehe.

To this:

From this:

The way I put the argument in Launch.json is the culprit. It works now!