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---
library_name: transformers
tags:
- automatic-speech-recognition
- hubert
- k2ssl
datasets:
- reazon-research/reazonspeech
language:
- ja
metrics:
- cer
base_model:
- reazon-research/japanese-hubert-base-k2
license: apache-2.0
pipeline_tag: automatic-speech-recognition
---
# `japanese-hubert-base-k2-rs35kh`
This model is a [Hubert Base](https://huggingface.co/reazon-research/japanese-hubert-base-k2) fine-tuned on the large-scale Japanese ASR corpus [ReazonSpeech v2.0](https://huggingface.co/datasets/reazon-research/reazonspeech) using the k2 framework.
## Usage
You can use this model through `transformers` library:
```python
import librosa
import numpy as np
from transformers import AutoProcessor, HubertForCTC
model = HubertForCTC.from_pretrained(
"reazon-research/japanese-hubert-base-k2-rs35kh",
torch_dtype=torch.bfloat16,
attn_implementation="flash_attention_2",
).to("cuda")
processor = AutoProcessor.from_pretrained("reazon-research/japanese-hubert-base-k2-rs35kh")
audio, _ = librosa.load(audio_filepath, sr=16_000)
audio = np.pad(audio, pad_width=int(0.5 * 16_000)) # Recommend to pad audio before inference
input_values = processor(
audio,
return_tensors="pt",
sampling_rate=16_000
).input_values.to("cuda").to(torch.bfloat16)
with torch.inference_mode():
logits = model(input_values).logits.cpu()
predicted_ids = torch.argmax(logits, dim=-1)[0]
transcription = processor.decode(predicted_ids, skip_special_tokens=True)
```
## Test Results
We report the Character Error Rate (CER) of our model and the other wav2vec2 families.
| Model | #Prameters⬇ | AVERAGE⬇ | JSUT-BASIC5000⬇ | Common Voice⬇ | TEDxJP-10K⬇ |
| :------------------------------------------------- | :---------: | :--------: | :-------------: | :-----------: | :---------: |
| reazon-research/japanese-wav2vec2-large-rs35kh | 319M | 16.25% | 11.00% | 18.23% | 19.53% |
| reazon-research/japanese-wav2vec2-base-rs35kh | 96.7M | 20.40% | 13.22% | 23.76% | 24.23% |
| reazon-research/japanese-hubert-base-k2-rs35kh | 98.4M | 11.23% | 9.94% | 11.59% | 12.18% |
| reazon-research/japanese-hubert-base-k2-rs35kh-bpe | 98.4M | **11.07%** | **9.76%** | **11.36%** | **12.10%** |
We also report the CER for long-form speech.
| Model | #Prameters⬇ | JSUT-BOOK⬇ |
| :------------------------------------------------------ | :---------: | :--------: |
| reazon-research/japanese-wav2vec2-large-rs35kh | 319M | 30.98% |
| reazon-research/japanese-wav2vec2-base-rs35kh | 96.7M | 82.84% |
| reazon-research/japanese-hubert-base-k2-rs35kh | 98.4M | **27.05%** |
| + [Silero VAD](https://github.com/snakers4/silero-vad) | | **19.59%** |
| reazon-research/japanese-hubert-base-k2-rs35kh-bpe | 98.4M | 84.55% |
| + [Silero VAD](https://github.com/snakers4/silero-vad) | | **19.34%** |
## Citation
```bibtex
@misc{japanese-hubert-base-k2-rs35kh,
title={japanese-hubert-base-k2-rs35kh},
author={Sasaki, Yuta},
url = {https://huggingface.co/reazon-research/japanese-hubert-base-k2-rs35kh},
year = {2025}
}
@article{yang2024k2ssl,
title={k2SSL: A faster and better framework for self-supervised speech representation learning},
author={Yang, Yifan and Zhuo, Jianheng and Jin, Zengrui and Ma, Ziyang and Yang, Xiaoyu and Yao, Zengwei and Guo, Liyong and Kang, Wei and Kuang, Fangjun and Lin, Long and others},
journal={arXiv preprint arXiv:2411.17100},
year={2024}
}
```
## License
[Apache Licence 2.0](https://choosealicense.com/licenses/apache-2.0/)