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The Training Process

You now know how to create state-of-the-art architectures for computer vision, natural language processing, tabular analysis, and collaborative filtering, and you know how to train them quickly. So we’re done, right? Not quite yet. We still have to explore a little bit more the training process.

We implemented this from scratch in a training loop, and also saw that PyTorch provides a simple class that does this calculation for each parameter for us. In this chapter we will build some faster optimizers, using a flexible foundation. But that’s not all we might want to change in the training process. For any tweak of the training loop, we will need a way to add some code to the basis of SGD. The fastai library has a system of callbacks to do this, and we will teach you all about it.