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I have a reinforcement based neural network training on the OpenAI gym CartPole-v1 environment. For the structure and training algorithm, assume it is the same as the one in this article.

Typically, it averages becoming more effective, eventually perfectly solving the environment (500/500 reward for several hundred games in a row) but then starts to regress. Typically somewhere in the range of 100~150/500 total reward. This seems to happen regardless of learning rate, but I haven't tested with very low learning rates (less than 0.01) because of the amount of time it takes to train.

Can anyone tell me why this happens? I can't seem to find any literature on it, but perhaps I just don't know the name.

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    $\begingroup$ Please post your working code, or e.g. a github reference. $\endgroup$ – J_H Nov 1 '17 at 20:50
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There seems to be some kind of overfitting happening.It happens when noise and fluctuation in data is learned as concept by your Neural Network Model.

https://en.wikipedia.org/wiki/Overfitting

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