Fix matmul_4bit gemv path for mismatched quant_state layout#1906
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datavorous wants to merge 1 commit intobitsandbytes-foundation:mainfrom
Open
Fix matmul_4bit gemv path for mismatched quant_state layout#1906datavorous wants to merge 1 commit intobitsandbytes-foundation:mainfrom
datavorous wants to merge 1 commit intobitsandbytes-foundation:mainfrom
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Fixes #1862
Problem:
gemvfast path inmatmul_4bitassumesquant_state.shapefollows(out_features, in_features), and can silently produce wrong output shape/values for transposed layout metadata.Fix: add a minimal shape guard in
matmul_4bitvector fast path; on mismatch, fall back toMatMul4Bit.apply.Scope: no kernel changes, no API changes, minimal 2-line guard.