Hi! New PyTorch user here 
I am trained my model using Pytorch Lighting and ModelCheckpoint with parameter save_top_k=1, so only the best checkpoint is saved. . After the training is finished I saved the model as usual with torch.save(model.state_dict()).
Now I want to deploy my model for inference. My epoch=42.ckpt file contains a model with better performance than the final model, so I want to use this checkpoint file. But the checkpoint file is three times larger than the normal model file (.pth).
How do I convert a .ckpt file to a .pth file?