Make Nf4 a NF4 Tensor subclass #18
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Summary
See title, fixes some failing torch compile tests with autograd
being cheeky though still:
https://github.com/drisspg/transformer_nuggets/pull/18/files#diff-6954806b06a395823616c5a0fefc77b5cf274b3f88a5381c38856cbf74d6f2bfR391-R392
Autograd function provides explicit control over whats happening and I do find that we need to create these "one op" subclasses for alot of quantization techniques to get PT2 to comply