PyTorch version compatibility with Libtorch iOS

@xta0 Just wanted to ask if there is any guidance for compatibility between torchscript generated from a specific version of PyTorch with the corresponding LibTorch version on iOS.

Should the PyTorch and LibTorch iOS version always match? (ex. PyTorch 1.5 generated torchscript should only be used on LibTorch 1.5)

Or should LibTorch work on any torchscript generated from a base version of PyTorch (say torchscript generated from PyTorch 1.5 should work for LibTorch 1.5 or greater unless otherwise specified)?

Thanks for any help!