webgpu: add MatMulBnb4 contrib op support#29587
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Implement the MatMulBnb4 quantized matmul operator for the WebGPU execution provider, supporting both FP4 (quant_type=0) and NF4 (quant_type=1) blockwise 4-bit weight dequantization.
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Implement the MatMulBnb4 quantized matmul operator for the WebGPU execution provider, supporting both FP4 (quant_type=0) and NF4 (quant_type=1) blockwise 4-bit weight dequantization.
Description
Add WebGPU execution provider support for the MatMulBnb4 contrib operator, enabling blockwise 4-bit quantized matmul (bitsandbytes-style FP4 and NF4) to run on WebGPU.
Motivation and Context
Models quantized with bitsandbytes 4-bit weights fell back to CPU when running on WebGPU, causing significant slowdowns, and cannot use graph capture feature.
Adding a native WebGPU kernel keeps these quantized MatMulBnb4 on the GPU, avoiding costly EP fallback and CPU/GPU data transfers.
marqo-fashionSigLIP-text-bnb4: ~30% faster
marqo-fashionSigLIP-vision-bnb4: ~20% faster