Checkpointing and Resuming Training

At every train.checkpoint_interval, a PyTorch Lightning checkpoint is saved. It is called model_epoch_<epoch_num>.pth. These are saved in train.results_dir, like so:

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            $ ls /results/train

'model_epoch_000.pth'
'model_epoch_001.pth'
'model_epoch_002.pth'
'model_epoch_003.pth'
'model_epoch_004.pth'