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Fix matmul_4bit gemv path for mismatched quant_state layout #1906

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Fix matmul_4bit gemv path for mismatched quant_state layout #1906

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2 changes: 2 additions & 0 deletions bitsandbytes/autograd/_functions.py
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Original file line number Diff line number Diff line change
Expand Up @@ -400,6 +400,8 @@ def matmul_4bit(
f"Some matrices hidden dimension is not a multiple of {quant_state.blocksize} and efficient inference kernels are not supported for these (slow). Matrix input size found: {A.shape}",
)
return MatMul4Bit.apply(A, B, out, bias, quant_state)
if A.shape[-1] != quant_state.shape[1]:
return MatMul4Bit.apply(A, B, out, bias, quant_state)
else:
out = F.gemv_4bit(A, B.t(), out, state=quant_state)
if bias is not None:
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