This model is a distilled version of alvanlii/whisper-small-cantonese on the Cantonese language.
Achieves a 9.7 CER (without punctuations), 11.59 CER (with punctuations) on Common Voice 16.0.
Has 3 decoder layers instead of regular 12 of the Whisper small model.
Uses ~2GB of GPU VRAM

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
Common Voice yue and zh-HK train sets

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

Comparisons to Whisper Small

	`alvanlii/distil-whisper-small-cantonese`	`alvanlii/whisper-small-cantonese`
CER (lower is better)	0.097	0.089
GPU Inference time (sdpa) [s/sample]	0.027	0.055
GPU Inference (regular) [s/sample]	0.027	0.308
CPU Inference [s/sample]	1.3	2.57
Params [M]	157	242

Note: inference time is calculated by taking the average inference time for the CV16 yue test set

Using the Model

import librosa

import torch
from transformers import WhisperForConditionalGeneration, WhisperProcessor

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

MODEL_NAME = "alvanlii/distil-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/distil-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"]