Ensure Temporary Files (input_embeddings.pt or output_embeddings.pt) Are Saved in Relative Directory

[COYLNOR]

This PR modifies how temporary files (e.g., input_embeddings.pt and output_embeddings.pt) are stored, addressing the issue mentioned in #905. Specifically, it ensures that these files are saved in a relative directory (_unsloth_temporary_saved_buffers) based on the basename of model.config._name_or_path when it is an absolute path.

This issue has been a challenge for me because the model paths on my server are read-only, and modifications to the original directory were not feasible.

Let me know if there’s anything else to improve!

[danielhanchen]

Thanks and happy new year! Apologies on the delay.

Could you actually make this an optional try except version - ie can you check if the original location is writeable (and not just readable), and if not then it uses your fix - thanks a lot!