Promote to production: voice-to-text dtype fix - #73
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Reported: 'Can't create a session … MatMulNBits Missing required scale:
model.decoder.embed_tokens.weight … DequantizeLinear'.
Whisper is an encoder-decoder model. A single-string dtype ('q8', the WASM
default) left the decoder — which holds embed_tokens — on a 4-bit (MatMulNBits)
variant whose scale tensor the bundled ONNX Runtime can't resolve, so the
session fails to create. Switch to a per-module dtype and force
decoder_model_merged to fp32 (unquantized, proper scales); the encoder stays
q8 on WASM / fp32 on WebGPU to limit the download.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
fix(voice-to-text): per-module dtype so the Whisper session loads
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Fixes the Whisper 'Can't create a session' (MatMulNBits missing scale) error via per-module dtype.
🤖 Generated with Claude Code