Model reference · open weights
kotoba-whisper is an open-weight audio or speech model from kotoba-tech. AxForge deploys and operates it for you on dedicated EU-owned hardware — with the licence handled where one is required.
Available as managed deployment — configured and operated for you on dedicated EU hardware, quoted per deployment.
What it is
| Released by | kotoba-tech |
|---|---|
| Type | Audio & music |
| Task | Speech→text |
| Parameters (lead) | 756M |
| Runs with | transformers |
| Released | 2024-10-18 |
| Popularity | 16k downloads / month |
| Licence | Open weights |
About
Kotoba-Whisper-v2.2 is a Japanese ASR model based on kotoba-tech/kotoba-whisper-v2.0, with
additional postprocessing stacks integrated as pipeline. The new features includes
(i) speaker diarization with diarizers
and (ii) adding punctuation with punctuators.
The pipeline has been developed through the collaboration between Asahi Ushio and Kotoba Technologies
Kotoba-Whisper-v2.2 is supported in the Hugging Face 🤗 Transformers library from version 4.39 onwards. To run the model, first install the latest version of Transformers.
pip install --upgrade pip
pip install --upgrade transformers accelerate torchaudio
pip install "punctuators==0.0.5"
pip install "pyannote.audio"
pip install git+https://github.com/huggingface/diarizers.git
To load pre-trained diarization models from the Hub, you'll first need to accept the terms-of-use for the following two models:
And subsequently use a Hugging Face authentication token to log in with:
huggingface-cli login
The model can be used with the pipeline.
wget https://huggingface.co/kotoba-tech/kotoba-whisper-v2.2/resolve/main/sample_audio/sample_diarization_japanese.mp3
import torch
from transformers import pipeline
# config
model_id = "kotoba-tech/kotoba-whisper-v2.2"
torch_dtype = torch.float16 if torch.cuda.is_available() else torch.float32
device = "cuda:0" if torch.cuda.is_available() else "cpu"
model_kwargs = {"attn_implementation": "sdpa"} if torch.cuda.is_available() else {}
# load model
pipe = pipeline(
model=model_id,
torch_dtype=torch_dtype,
device=device,
model_kwargs=model_kwargs,
batch_size=8,
trust_remote_code=True,
)
# run inference
result = pipe("sample_diarization_japanese.mp3", chunk_length_s=15)
print(result)
>>> {
'chunks/SPEAKER_00': [{'speaker_id': 'SPEAKER_00', 'text': '水をマレーシアから買わなくてはならないのです', 'timestamp': [22.1, 24.97]}],
'chunks/SPEAKER_01': [{'speaker_id': 'SPEAKER_01', 'text': 'これも先ほどがずっと言っている自分の感覚的には大丈夫ですけれども', 'timestamp': [0.03, 13.85]},
{'speaker_id': 'SPEAKER_01', 'text': '今は屋外の気温', 'timestamp': [5.03, 18.85]},
{'speaker_id': 'SPEAKER_01', 'text': '昼も夜も上がってますので', 'timestamp': [7.63, 21.45]},
{'speaker_id': 'SPEAKER_01', 'text': '空気の入れ替えだけではかえって人が上がってきます', 'timestamp': [9.91, 23.73]}],
'chunks/SPEAKER_02': [{'speaker_id': 'SPEAKER_02', 'text': '愚直にやっぱりその街の良さをアピールしていくという', 'timestamp': [13.48, 22.1]},
{'speaker_id': 'SPEAKER_02', 'text': 'そういう姿勢が基本にあった上での', 'timestamp': [17.26, 25.88]},
{'speaker_id': 'SPEAKER_02', 'text': 'こういうPR作戦だと思うんですよね', 'timestamp': [19.86, 28.48]}],
'chunks': [{'speaker_id': 'SPEAKER_00', 'text': '水をマレーシアから買わなくてはならないのです', 'timestamp': [22.1, 24.97]},
{'speaker_id': 'SPEAKER_01', 'text': 'これも先ほどがずっと言っている自分の感覚的には大丈夫ですけれども', 'timestamp': [0.03, 13.85]},
{'speaker_id': 'SPEAKER_01', 'text': '今は屋外の気温', 'timestamp': [5.03, 18.85]},
{'speaker_id': 'SPEAKER_01', 'text': '昼も夜も上がってますので', 'timestamp': [7.63, 21.45]},
{'speaker_id': 'SPEAKER_01', 'text': '空気の入れ替えだけではかえって人が上がってきます', 'timestamp': [9.91, 23.73]},
{'speaker_id': 'SPEAKER_02', 'text': '愚直にやっぱりその街の良さをアピールしていくという', 'timestamp': [13.48, 22.1]},
{'speaker_id': 'SPEAKER_02', 'text': 'そういう姿勢が基本にあった上での', 'timestamp': [17.26, 25.88]},
{'speaker_id': 'SPEAKER_02', 'text': 'こういうPR作戦だと思うんですよね', 'timestamp': [19.86, 28.48]}],
'speaker_ids': ['SPEAKER_00', 'SPEAKER_01', 'SPEAKER_02'],
'text/SPEAKER_00': '水をマレーシアから買わなくてはならないのです',
'text/SPEAKER_01': 'これも先ほどがずっと言っている自分の感覚的には大丈夫ですけれども今は屋外の気温昼も夜も上がってますので空気の入れ替えだけではかえって人が上がってきます',
'text/SPEAKER_02': '愚直にやっぱりその街の良さをアピールしていくというそういう姿勢が基本にあった上でのこういうPR作戦だと思うんですよね'
}
- result = pipe("sample_diarization_japanese.mp3")
+ result = pipe("sample_diarization_japanese.mp3", add_punctuation=True)
The punctuator will be applied to text/* feature. Eg.)
'text/SPEAKER_00': '水をマレーシアから買わなくてはならないのです。'
'text/SPEAKER_01': 'これも先ほどがずっと言っている。自分の感覚的には大丈夫です。けれども。今は屋外の気温、昼も夜も上がってますので、空気の入れ替えだけではかえって人が上がってきます。'
'text/SPEAKER_02': '愚直にその街の良さをアピールしていくという。そういう姿勢が基本にあった上での、こういうPR作戦だと思うんですよね。'
- result = pipe("sample_diarization_japanese.mp3")
+ result = pipe("sample_diarization_japanese.mp3", num_speakers=3)
or
- result = pipe("sample_diarization_japanese.mp3")
+ result = pipe("sample_diarization_japanese.mp3", min_speakers=2, max_speakers=5)
- result = pipe("sample_diarization_japanese.mp3")
+ result = pipe("sample_diarization_japanese.mp3", add_silence_end=0.5, add_silence_start=0.5) # adding 0.5 sec silence to before/after the audio
We recommend using Flash-Attention 2 if your GPU allows for it. To do so, you first need to install Flash Attention:
From the published model card. Full card on the HuggingFace links in the sidebar.
Benchmarks
As published on the model card — the maker's own numbers, not measured by AxForge.
| Task | Dataset | Metric | Score |
|---|---|---|---|
| automatic-speech-recognition | CommonVoice 8 (Japanese test set) | WER | 58.800 |
| automatic-speech-recognition | CommonVoice 8 (Japanese test set) | CER | 9.200 |
| automatic-speech-recognition | ReazonSpeech (held out test set) | WER | 55.600 |
| automatic-speech-recognition | ReazonSpeech (held out test set) | CER | 11.600 |
| automatic-speech-recognition | JSUT Basic 5000 | WER | 63.700 |
| automatic-speech-recognition | JSUT Basic 5000 | CER | 8.400 |
Using it via the API
Once AxForge deploys kotoba-whisper for you, it answers on the OpenAI-compatible API — the same base URL and keys as every other model. (kotoba-whisper below is illustrative; you get the exact model name on deployment.)
$ curl -sS https://api.axforge.ai/v1/audio/transcriptions \ -H "Authorization: Bearer $AXFORGE_API_KEY" \ -F model="kotoba-whisper" -F file=@audio.mp3
Create an account — your API key is available in the console. 3M free tokens every 30 days with every new account.