Update for new version of HF transformers.

[manueldeprada]

We've recently merged a layer-wise refactor of the cache system in Transformers: huggingface/transformers#39106.

While testing your repo for compatibility, I had to adapt parts of the code to the new interface. To help with the migration, I've included my changes below. These are not intended as a full PR (I've only tested a small subset) but they should serve as a helpful guide.

Some updates are deprecations (e.g., cache.key_cache[i] is still supported via a backward-compatibility layer, though cache.layers[i].keys is preferred). However, there are also breaking changes, particularly in private attributes: for example, cache._quantized_key_cache is now cache.cache_processor._quantized_keys.

I also encountered some CUDA illegal memory access errors, which I suspect are related to: huggingface/transformers#39474 and contiguous memory requirements in FlashAttention v2.

In short, the upcoming Transformers release introduces necessary but potentially breaking changes that may impact this repo. I recommend testing against the main branch, and I'm happy to help if further issues come up.

[maxjeblick]

Thanks a lot for opening this PR, we really appreciate this proactive engagement!

We merged KvZipPress; this press would also require some updates. Would be great if you could update this PR.

Regarding the next steps:

• We will wait till transformers version 4.54 is released (it should contain [cache refactor] Move all the caching logic to a per-layer approach huggingface/transformers#39106).
• Once out, we will review this PR (I expect it to be approved rather quickly). pyproject.toml would need to be updated to fix transformers >= 4.54
• Once this PR has been merged, we will cut a new release to be compatible with transformers >= 4.54

[maxjeblick]

Hi @manueldeprada
As you may have noticed, the new refactoring of the attention implementation in transformers, alongside with some other changes, currently breaks kvpress.

As this is a larger topic, the maintainers of this repo are currently working on a fix for this.

[manueldeprada]

Great! Please make sure to clone the main branch, we recently merged a further simplification of KV caches!:
huggingface/transformers#39797

Hopefully this is the final stable interface!!

This PR should provide enough inspiration to quickly adapt KVPress. Ping me if there are further pain points!