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MatmulNBits prepacking scales fix #27412

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Merged
hariharans29 merged 11 commits into from
Feb 24, 2026
Merged

MatmulNBits prepacking scales fix #27412

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e579d41
Fix incorrect scales element count calculation while pre-packing scal…
hariharans29 Feb 21, 2026
34ce775
Add test
hariharans29 Feb 21, 2026
9d40b7d
Add test
hariharans29 Feb 23, 2026
51526a8
Add MatmulNBits unit test and remove shared lib test
hariharans29 Feb 23, 2026
c4e3e49
Add comment
hariharans29 Feb 23, 2026
6f5da27
Add test for fp16
hariharans29 Feb 23, 2026
c101131
Update onnxruntime/test/contrib_ops/matmul_4bits_test.cc
hariharans29 Feb 23, 2026
972a403
Experiment
hariharans29 Feb 23, 2026
26114e7
More fixes
hariharans29 Feb 23, 2026
8b9f0bb
Experiment - 2
hariharans29 Feb 23, 2026
2559293
Update tolerance
hariharans29 Feb 23, 2026
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6 changes: 3 additions & 3 deletions onnxruntime/contrib_ops/cpu/quantization/matmul_nbits.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -359,9 +359,9 @@ Status MatMulNBits<MLFloat16>::PrePack(const Tensor& tensor, int input_idx, /*ou
OpKernel::Info().TryGetConstantInput(InputIndex::scales, &scales);
if (scales && MlasQNBitGemmScalesPacked(K_, nbits_, block_size_, compute_type_, has_zp_input_)) {
auto sptr = scales->Data<MLFloat16>();
auto tensor_size = static_cast<size_t>(tensor.Shape().Size());
auto ptr = IAllocator::MakeUniquePtr<float>(alloc, tensor_size, true);
MlasConvertHalfToFloatBuffer(sptr, ptr.get(), tensor_size);
auto scales_size = static_cast<size_t>(scales->Shape().Size());
auto ptr = IAllocator::MakeUniquePtr<float>(alloc, scales_size, true);
MlasConvertHalfToFloatBuffer(sptr, ptr.get(), scales_size);
scales_fp32_ = std::move(ptr);
}

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