Question by IronGrimoire · Dec 13, 2021 at 12:50 AM · ai command-line

Trouble with the mlagents-learn command

I am getting an error when I try running the mlagents-learn command.
I have installed ml-agents 2.0.1 in unity using the package manager.
I have installed the python (package?) mlagents and mlagents-envs 0.27

I have been following along with the "Making a New Learning Environment" documentation tutorial at - https://github.com/Unity-Technologi..._docs/docs/Learning-Environment-Create-New.md

I get close to the end - the step where I enter the command:

 mlagents-learn path/rollerball_config.yaml --run-id=RollerBall

throws the following error:

 mlagents.trainers.exception.TrainerConfigError: 
 The option ï»¿behaviors was specified in your YAML file, but is invalid.

Which I find a little odd due to the "ï»¿" symbols, like it can't say exactly which option it doesn't like. I am using the YAML file given by the tutorial:

 behaviors:
   Roll:
     trainer_type: ppo
     hyperparameters:
       batch_size: 10
       buffer_size: 100
       learning_rate: 3.0e-4
       beta: 5.0e-4
       epsilon: 0.2
       lambd: 0.99
       num_epoch: 3
       learning_rate_schedule: linear
     network_settings:
       normalize: false
       hidden_units: 128
       num_layers: 2
     reward_signals:
       extrinsic:
         gamma: 0.99
         strength: 1.0
     max_steps: 500000
     time_horizon: 64
     summary_freq: 10000

Can anyone point me in the right direction or have any ideas on what I can try next?

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