How to load .pth file weights?

I've been experimenting with candle and re-implementing ESRGAN in it. I ended up needing to convert a couple .pth files I have into .safetensors format in python in order to load them into the VarBuilder. I saw on the docs you say this supports loading pytorch weights directly though, but there does not seem to be an example on how to do that. I looked into the pickle module included in the library and got as far as being able to read the weights into a pickle format with TensorInfo, but then I got stuck trying to convert those to tensors and get it in a format VarBuilder would accept.

An example on how to either load these weights or convert them to safetensors format in rust would be great, thanks!