Fix A_log precision in mamba.py#1028
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eyupcanakman wants to merge 1 commit intoml-explore:mainfrom
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fixes #565.
mamba.py computes mx.exp(self.A_log) without casting to float32 first. When the model is loaded in bf16, the exponential loses precision and logprobs diverge from HuggingFace. mamba2.py, plamo2.py, and gated_delta.py all cast A_log to float32 at the usage site. Apply the same pattern here.