What is the PyTorch Lightning framework?

PyTorch Lightning is a lightweight PyTorch extension library designed to simplify and standardize the training process of deep learning models. It offers a range of predefined training loops and components that make it easier for users to build and manage complex deep learning models. PyTorch Lightning also provides many useful features such as distributed training, automatic tuning, and logging, to help users develop and deploy deep learning models more efficiently. By using PyTorch Lightning, users can focus more on model design and experiments without having to spend too much energy on the details of the training process.