Stable version in pytorch-lightning 1.5.2

If you want to refer to the old version of PyTorch Lightning, please use this version.

NOTE: There is a problem that len(train_loader) does not work in pytorch-lightning 1.5.2.

• After updating to 1.5.2, NotImplementedError: train_dataloader · Discussion #10652 · PyTorchLightning/pytorch-lightning Lightning-AI/pytorch-lightning#10652

Stable version in PyTorch Lightning 1.3.8

If you want to refer to the old version of PyTorch Lightning, please use this version.