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Whisper Small zh-HK - Alvin

This model is a fine-tuned version of openai/whisper-small on the Cantonese language. It achieves a 8.94 CER (without punctuations), 10.73 CER (with punctuations) on Common Voice 16.0

Training and evaluation data

For training,

  • CantoMap: Winterstein, Grégoire, Tang, Carmen and Lai, Regine (2020) "CantoMap: a Hong Kong Cantonese MapTask Corpus", in Proceedings of The 12th Language Resources and Evaluation Conference, Marseille: European Language Resources Association, p. 2899-2906.
  • Cantonse-ASR: Yu, Tiezheng, Frieske, Rita, Xu, Peng, Cahyawijaya, Samuel, Yiu, Cheuk Tung, Lovenia, Holy, Dai, Wenliang, Barezi, Elham, Chen, Qifeng, Ma, Xiaojuan, Shi, Bertram, Fung, Pascale (2022) "Automatic Speech Recognition Datasets in Cantonese: A Survey and New Dataset", 2022. Link: https://arxiv.org/pdf/2201.02419.pdf
Name # of Hours
Common Voice 16.0 zh-HK Train 138
Common Voice 16.0 yue Train 85
Cantonese-ASR 72
CantoMap 23
Pseudo-Labelled YouTube Data 438
Total 756

For evaluation, Common Voice 16.0 yue Test set is used.

Results

  • CER (lower is better): 0.1073
    • down from 0.1581 in the previous version dated Jan 28, 2023
  • GPU Inference with Fast Attention (example below): 0.055s/sample
    • Note all GPU evaluations are done on RTX 3090 GPU
  • GPU Inference: 0.308s/sample
  • CPU Inference: 2.57s/sample
  • GPU VRAM: ~1.5 GB

Using the Model

import librosa

import torch
from transformers import WhisperForConditionalGeneration, WhisperProcessor

y, sr = librosa.load('audio.mp3', sr=16000)

MODEL_NAME = "alvanlii/whisper-small-cantonese"

processor = WhisperProcessor.from_pretrained(MODEL_NAME)
model = WhisperForConditionalGeneration.from_pretrained(MODEL_NAME)

model.config.forced_decoder_ids = None
model.config.suppress_tokens = []
model.config.use_cache = False

processed_in = processor(y, sampling_rate=sr, return_tensors="pt")
gout = model.generate(
    input_features=processed_in.input_features, 
    output_scores=True, return_dict_in_generate=True
)
transcription = processor.batch_decode(gout.sequences, skip_special_tokens=True)[0]
print(transcription)
  • Alternatively, you can use huggingface pipelines
from transformers import pipeline
MODEL_NAME = "alvanlii/whisper-small-cantonese" 
lang = "zh"
pipe = pipeline(
    task="automatic-speech-recognition",
    model=MODEL_NAME,
    chunk_length_s=30,
    device=device,
)
pipe.model.config.forced_decoder_ids = pipe.tokenizer.get_decoder_prompt_ids(language=lang, task="transcribe")
text = pipe(file)["text"]

Model Speedup

Just add attn_implementation="sdpa" for Flash Attention.

model = AutoModelForSpeechSeq2Seq.from_pretrained(
    "alvanlii/whisper-small-cantonese",
    torch_dtype=torch_dtype,
    low_cpu_mem_usage=True,
    use_safetensors=True,
    attn_implementation="sdpa",
)

Using Flash Attention reduced the amount of time taken per sample from 0.308s to 0.055s.

Speculative Decoding

You can use a bigger model, then use alvanlii/whisper-small-cantonese to speed up inference with basically no loss in accuracy.

model_id = "simonl0909/whisper-large-v2-cantonese"
model = AutoModelForSpeechSeq2Seq.from_pretrained(
    model_id,
    torch_dtype=torch_dtype,
    low_cpu_mem_usage=True,
    use_safetensors=True,
    attn_implementation="sdpa",
)
model.to(device)

processor = AutoProcessor.from_pretrained(model_id)

assistant_model_id = "alvanlii/whisper-small-cantonese"

assistant_model = AutoModelForSpeechSeq2Seq.from_pretrained(
    assistant_model_id,
    torch_dtype=torch_dtype,
    low_cpu_mem_usage=True,
    use_safetensors=True,
    attn_implementation="sdpa",
)

assistant_model.to(device)
...
model.generate(**inputs, use_cache=True, assistant_model=assistant_model)

In the original simonl0909/whisper-large-v2-cantonese model, it runs at 0.714s/sample for a CER of 7.65.
Using speculative decoding with alvanlii/whisper-small-cantonese, it runs at 0.137s/sample for a CER of 7.67, which is much faster.

Training Hyperparameters

  • learning_rate: 5e-5
  • train_batch_size: 25 (on 1 3090 GPU)
  • eval_batch_size: 8
  • gradient_accumulation_steps: 4
  • total_train_batch_size: 25x4=100
  • optimizer: Adam with betas=(0.9,0.999) and epsilon=1e-08
  • lr_scheduler_type: linear
  • lr_scheduler_warmup_steps: 500
  • training_steps: 15000
  • augmentation: None
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