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Adding 3 different weight freezing approaches in an example script under:
notebooks/embedding_wrapper.py
.The first wrapper uses a mask and ended up being equivalent to the code that Chris already had set up.
The second wrapper uses a hook. That's only recommended for debugging, so ultimately not useful for us. It helped me spot an error in the other code though, so I think the pattern is useful and I'm keeping it in for reference.
The third wrapper uses a custom autograd function. That may be interesting, since it's more lowlevel than the masking code.
Finally, this code contains a test setup which doesn't pull in hf / transformers/ etc. That's convenient for quick debugging.