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README.md

PyTorch Lightning

General

separating research code, engineering code and add-ons

Architecture

Trainer -> engineering code
LightningModule -> research code
Callback -> add-ons

Callbacks

callback is really a general term from CS, which means pluging-in some code to be executed at arbitrary point in the code, which means arbitrary time and state of code execution
in lightning some functionalities, like early stopping, model checkpointing, logging, learning rate scheduling, etc. are implemented as callbacks

References