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RL training result very different from the result of 'sim'

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Matlab v.2020a /RL toobox /DQN agent
I load the save_agent and use 'sim' want to get the result, but the result very different from the training result.
Why they are different?
How to fix this problem?
training result
'sim' result

Accepted Answer

Emmanouil Tzorakoleftherakis
Please see this post that explains why simulation results may differ during training and after training.
If the simulation results are not good enough (regardless of whether they are different from training simulations or not), you likely need to train further.

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