NilsBriggen
4bddc67e1a
The WASM backend couldn't create a session — "TransposeDQWeightsFor
MatMulNBits Missing required scale" — so transcription failed to start on
mobile (which we route to WASM) and on any no-WebGPU device. Root cause:
the default quantized Whisper decoder (q8/q4, decoder_model_merged) uses
MatMulNBits ops that the onnxruntime-web bundled with transformers.js
4.2.0 cannot load on WASM. Reproduced and bisected in a browser harness:
across both Xenova and onnx-community repos, q8/q4/string-fp32 all fail on
WASM with this error, while an EXPLICIT per-file fp32 decoder
({ encoder_model: 'fp32', decoder_model_merged: 'fp32' }) loads and runs
(2/2 chunks, no error) on a no-GPU machine.
So WASM now requests that explicit fp32 decoder; WebGPU keeps fp16. Larger
download on the WASM path, but it actually loads and runs — q8 never did
on WASM. (4.2.0 is the latest transformers.js, so bumping isn't an option.)
tsc clean, 279 tests pass, web export OK.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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