Various improvements to low-rank + quantized backpropagation, #2729
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…ameters, added support for backpropagation with qtensors and qmatmul.
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Added some changes to the back-propagation system for reducing VRAM usage when not all tensors are variables (loras mostly).
Also added support for qmatmul in back-propagation -- let me know if there is a more intended way to accomplish that then what I have set up here. The whole quantized math system seems very much an afterthought to the rest of candle's design.