fastxtend

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This PR replaces the fastxtend optimizers with [optimi](https://github.com/warner-benjamin/optimi) optimizers while retaining support for bitsandbytes eight-bit optimizers. `optimizer.utils` adds a mixin class `` to assist in converting any PyTorch optimizer into...

warner-benjamin

Hi @warner-benjamin , We recently released fastai 2.8.0 which replaces `fastcore.dispatch` with [`plum-dispatch`](https://github.com/beartype/plum) and `fastcore.transform` with [`fasttransform`](https://github.com/AnswerDotAI/fasttransform). We wrote [a migration guide](https://answerdotai.github.io/fasttransform/fastcore_migration_guide.html) that might help you with the change. If...

RensDimmendaal