What is the difference between a .ckpt and a .pth file in Pytorch?
I am following a code from GitHub that uses Pytorch.
The model is saved using :
model.save(ARGS.working_dir + '/model_%d.ckpt' % (epoch+1)).  

What is the difference between using .pth and .ckpt in Pytorch?

There is no difference. the extension in Pytorch models that you see is something random. You can choose anything.
People usually use pth to indicate a PyTorcH model (and hence .pth). but then again its completely up to you on how you want to save your model.
