Allow ESMFold run w/ pre-downloaded models

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[tomsercu]

@YaoYinYing could you try the following:

• store model weights in /my/favorite/path/hub/checkpoint/{modelname}.pt
• export TORCH_HOME="/my/favorite/path"

Would that be satisfactory?

All the load_from_local_path() was more for debugging/development purpose and ideally we stick to standard structure of downloading & caching model paths as much as possible.

[YaoYinYing]

@tomsercu Thanks for your hints! Yes. It makes sense to use torch.hub.set_dir() for setting model_pth to pre-downloaded weights. One could download these files into a subdir checkpoints under model_pth. I will consider another PR with my latest changes!