Kotoba-Whisper-v1.1
Kotoba-Whisper-v1.1 is a Japanese ASR model based on kotoba-tech/kotoba-whisper-v1.0, with
additional postprocessing stacks integrated as pipeline
. The new features includes
(i) improved timestamp achieved by stable-ts and (ii) adding punctuation with punctuators.
These libraries are merged into Kotoba-Whisper-v1.1 via pipeline and will be applied seamlessly to the predicted transcription from kotoba-tech/kotoba-whisper-v1.0.
The pipeline has been developed through the collaboration between Asahi Ushio and Kotoba Technologies
Following table presents the raw CER (unlike usual CER where the punctuations are removed before computing the metrics, see the evaluation script here) along with the.
model | CommonVoice 8.0 (Japanese) | JSUT Basic 5000 | ReazonSpeech Test |
---|---|---|---|
kotoba-tech/kotoba-whisper-v1.0 | 15.6 | 15.2 | 17.8 |
kotoba-tech/kotoba-whisper-v1.1 (punctuator + stable-ts) | 13.7 | 11.2 | 17.4 |
kotoba-tech/kotoba-whisper-v1.1 (punctuator) | 13.9 | 11.4 | 18 |
kotoba-tech/kotoba-whisper-v1.1 (stable-ts) | 15.7 | 15 | 17.7 |
openai/whisper-large-v3 | 12.9 | 13.4 | 20.6 |
Regarding to the normalized CER, since those update from v1.1 will be removed by the normalization, kotoba-tech/kotoba-whisper-v1.1 marks the same CER values as kotoba-tech/kotoba-whisper-v1.0.
Latency
Kotoba-whisper-v1.1 improves the punctuation and the timestamp of the output from Kotoba-whisper-v1.0. However, since we apply the punctuator and stable-ts to each chunk, we need to obtain the timestamps, which decreases the latency of the original kotoba-whisper-v1.0. See the following table comparing the inference speed on transcribing 50min Japanese speech audio, where we report the average over five independent runs.
model | return_timestamps | time (mean) |
---|---|---|
kotoba-tech/kotoba-whisper-v1.0 | False | 10.8 |
kotoba-tech/kotoba-whisper-v1.0 | True | 15.7 |
kotoba-tech/kotoba-whisper-v1.1 (punctuator + stable-ts) | True | 17.9 |
kotoba-tech/kotoba-whisper-v1.1 (punctuator) | True | 17.7 |
kotoba-tech/kotoba-whisper-v1.1 (stable-ts) | True | 16.1 |
openai/whisper-large-v3 | False | 29.1 |
openai/whisper-large-v3 | True | 37.9 |
See the full table here.
Transformers Usage
Kotoba-Whisper-v1.1 is supported in the Hugging Face π€ 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 stable-ts==2.16.0
pip install punctuators==0.0.5
Transcription
The model can be used with the pipeline
class to transcribe audio files as follows:
import torch
from transformers import pipeline
from datasets import load_dataset
# config
model_id = "kotoba-tech/kotoba-whisper-v1.1"
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 {}
generate_kwargs = {"language": "japanese", "task": "transcribe"}
# load model
pipe = pipeline(
model=model_id,
torch_dtype=torch_dtype,
device=device,
model_kwargs=model_kwargs,
chunk_length_s=15,
batch_size=16,
trust_remote_code=True,
stable_ts=True,
punctuator=True
)
# load sample audio
dataset = load_dataset("japanese-asr/ja_asr.reazonspeech_test", split="test")
sample = dataset[0]["audio"]
# run inference
result = pipe(sample, return_timestamps=True, generate_kwargs=generate_kwargs)
print(result)
- To transcribe a local audio file, simply pass the path to your audio file when you call the pipeline:
- result = pipe(sample, return_timestamps=True, generate_kwargs=generate_kwargs)
+ result = pipe("audio.mp3", return_timestamps=True, generate_kwargs=generate_kwargs)
- To deactivate stable-ts:
- stable_ts=True,
+ stable_ts=False,
- To deactivate punctuator:
- punctuator=True,
+ punctuator=False,
Transcription with Prompt
Kotoba-whisper can generate transcription with prompting as below:
import re
import torch
from transformers import pipeline
from datasets import load_dataset
# config
model_id = "kotoba-tech/kotoba-whisper-v1.1"
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 {}
generate_kwargs = {"language": "japanese", "task": "transcribe"}
# load model
pipe = pipeline(
model=model_id,
torch_dtype=torch_dtype,
device=device,
model_kwargs=model_kwargs,
chunk_length_s=15,
batch_size=16,
trust_remote_code=True
)
# load sample audio
dataset = load_dataset("japanese-asr/ja_asr.reazonspeech_test", split="test")
# --- Without prompt ---
text = pipe(dataset[10]["audio"], generate_kwargs=generate_kwargs)['text']
print(text)
# 81ζ³γεεΌ·γθ΅°γγ«ε€γγ£γ¦γγΎγγ
# --- With prompt ---: Let's change `81` to `91`.
prompt = "91ζ³"
generate_kwargs['prompt_ids'] = pipe.tokenizer.get_prompt_ids(prompt, return_tensors="pt").to(device)
text = pipe(dataset[10]["audio"], generate_kwargs=generate_kwargs)['text']
# currently the pipeline for ASR appends the prompt at the beginning of the transcription, so remove it
text = re.sub(rf"\A\s*{prompt}\s*", "", text)
print(text)
# γγ£γΆγ£γγ§γγΉγ«γ¬γγγ91ζ³γεεΌ·γθ΅°γγ«ε€γγ£γ¦γγΎγγ
Flash Attention 2
We recommend using Flash-Attention 2 if your GPU allows for it. To do so, you first need to install Flash Attention:
pip install flash-attn --no-build-isolation
Then pass attn_implementation="flash_attention_2"
to from_pretrained
:
- model_kwargs = {"attn_implementation": "sdpa"} if torch.cuda.is_available() else {}
+ model_kwargs = {"attn_implementation": "flash_attention_2"} if torch.cuda.is_available() else {}
Acknowledgements
- OpenAI for the Whisper model.
- Hugging Face π€ Transformers for the model integration.
- Hugging Face π€ for the Distil-Whisper codebase.
- Reazon Human Interaction Lab for the ReazonSpeech dataset.
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Evaluation results
- WER on CommonVoice_8.0 (Japanese)self-reported59.270
- CER on CommonVoice_8.0 (Japanese)self-reported9.440
- WER on ReazonSpeech (Test)self-reported56.620
- CER on ReazonSpeech (Test)self-reported12.600
- WER on JSUT Basic5000self-reported64.360
- CER on JSUT Basic5000self-reported8.480