Parallel reinforcement learning on HPC with warning "Received duplicate id = x from worker"

When I'm running training of a reinforcement learning agent using a HPC cluster and parallel computing toolbox I get the warning "Received duplicate id = 22 from worker" (or other id) after e.g. 180 training episodes. Then the training seems to be stopped and there is no further error or warning. I am using this command to start the .m-script:

module load matlab/R2021a

matlab -nodisplay < rl_training.m

When I set

trainOpts.UseParallel = false;

often I get the warning "Error reading character from command line". Does anyone know why these messages are occurring and is there perhaps a way to continue the training?

[Raymond Norris]

I would suggest contacting MathWorks Technical Support ([e-mail]).

[Mirjan Heubaum]

Thanks, I will try that.

[Mirjan Heubaum]

Per mail or per support page?

[Image Analyst]

If you have a maintenance contract in place, I'd call them on the phone. Of course you can use email like @Raymond Norris said. I never use email or a support page since when I encounter a problem I need an immediate solution so I call them.

[Walter Roberson]

I never call them, myself -- I open support cases, where I can describe the problem and include code and results to show clearly what is expected and what is received instead. 85% of the time the response is going to be "You are right, that's not good, the developers have been notified and it might get fixed some day".