Not the poster, but maybe I can help.

Your comment is a little unclear, so it‘s hard to parse your exact question. But it seems you are conflating 3 things, PyTorch, RL and Gym/Training (?).

– PyTorch is a framework which lets you define neural network models.

– RL is a collection of methods to train neural networks (change the network parameters to improve its performance).

– An RL-Gym is a framework to apply the neural networks to some problem. This lets you collect the data necessary to later use the methods of RL to train your model.

Thanks, Yes PyTorch is a framework largely used to create neural network models.