fix(optim): mark unused amsgrad/optim_bits as deprecated in 8-bit Adam classes - #2063
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…bit Adam classes Replace misleading "Note:" docstring entries with proper `.. deprecated::` Sphinx directives in Adam8bit, PagedAdam8bit, AdamW8bit, and PagedAdamW8bit. These parameters exist only for signature compatibility with the base Adam/AdamW classes and will be removed in a future version. Add test coverage for the Adam8bit/AdamW8bit parameter validation guards which previously only existed for LAMB8bit and Adagrad8bit. Fixes bitsandbytes-foundation#1261
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Summary
What's the problem?
The amsgrad and optim_bits parameters in the 8-bit Adam optimizer classes have docstrings that describe them as functional parameters with a small "Note:" afterthought. This is misleading — these params exist only for signature compatibility with the base Adam/AdamW classes and are completely non-functional (hardcoded to 8-bit, amsgrad raises ValueError).
Changes
No breaking changes — params remain in the signature for backwards compatibility.
Fixes #1261