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.
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).
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.
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.
Model Card for Model ID
Model Details
Model Description
This is the model card of a 🤗 transformers model that has been pushed on the Hub. This model card has been automatically generated.
Developed by: [More Information Needed]
Funded by [optional]: [More Information Needed]
Shared by [optional]: [More Information Needed]
Model type: [More Information Needed]
Language(s) (NLP): [More Information Needed]
License: [More Information Needed]
Finetuned from model [optional]: [More Information Needed]
Model Sources [optional]
Repository: [More Information Needed]
Paper [optional]: [More Information Needed]
Demo [optional]: [More Information Needed]
Uses
Direct Use
[More Information Needed]
Downstream Use [optional]
[More Information Needed]
Out-of-Scope Use
[More Information Needed]
Bias, Risks, and Limitations
[More Information Needed]
Recommendations
Users (both direct and downstream) should be made aware of the risks, biases and limitations of the model. More information needed for further recommendations.
