moonshine-base-ja: transcribe.cpp GGUF

GGUF conversions of UsefulSensors/moonshine-base-ja for use with transcribe.cpp.

Ported from upstream commit f9d4e6a, pinned 2026-05-12. Validated against the transformers reference at transcribe.cpp commit 90bf720 on 2026-05-12.

UsefulSensors' Moonshine base fine-tuned on Japanese. Same encoder-decoder transformer architecture as moonshine-base (62M parameters): consumes 16 kHz raw PCM via a three-layer Conv1d stem (no STFT, no mel filterbank) and emits transcript-only output. Single-language (ja); no translation, no language detection, no timestamps.

Downloads

CER measured on the FLEURS-ja test split (650 utterances) using the transcribe.cpp default decode (greedy, num_beams=1, max_length=192 — matching the upstream generation_config).

UsefulSensors does not publish a per-language CER number for this variant. As a comparable baseline we ran the Transformers F32 reference (MoonshineForConditionalGeneration, fp32 on MPS) on the same manifest: 10.69% CER. The C++ F32/F16 numbers above match the reference within bootstrap-CI noise; Q8_0 introduces a small additional drift from F16 (typically within 0.1pp).

Usage

Build transcribe.cpp from source:

git clone git@github.com:handy-computer/transcribe.cpp.git
cd transcribe.cpp
cmake -B build && cmake --build build

Run on a 16 kHz mono WAV:

build/bin/transcribe-cli \
  -m moonshine-base-ja-Q8_0.gguf \
  input.wav

If your audio isn't already 16 kHz mono WAV, convert it first:

ffmpeg -i input.mp3 -ar 16000 -ac 1 output.wav

See the transcribe.cpp model page for performance numbers, numerical validation, and reproduction steps.

License

Inherited from the base model: MIT. See the upstream model card for full terms.

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Original Model Card

The section below is reproduced from UsefulSensors/moonshine-base-ja at commit f9d4e6a for offline reference. The upstream card is the authoritative source.

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