WeST

We Speech Transcript, LLM based Speech Recognition/Transcript in 300 lines of code.

Details

Motivated by SLAM-ASR and LLaMA 3.1, Our model consists of a LLM, a Speech Encoder, and a Projector(speech adapter in LLaMA). Only the projector is trainable.

• LLM, could be LLaMA, QWen, etc.
• Speech Encoder, like whisper.

Install

pip install -r requirements.txt

Data Prepare

The training data(train.json) and test data(test.jsonl) should be prepared as jsonl format, which contains wav and txt in each line. Here is an example:

{"wav": "/data/BAC009S0764W0121.wav", "txt": "甚至出现交易几乎停滞的情况"}
{"wav": "/data/BAC009S0764W0122.wav", "txt": "一二线城市虽然也处于调整中"}

Training

torchrun --standalone --nnodes=1 --nproc_per_node=8 train.py \
    --llm_model_name_or_path Qwen2-1.5B-Instruct \
    --whisper_model_name_or_path tiny \
    --data_path train.jsonl \
    --bf16 True \
    --output_dir Qwen-1.5B-Instruct-whisper-tiny \
    --num_train_epochs 5 \
    --per_device_train_batch_size 8 \
    --per_device_eval_batch_size 1 \
    --gradient_accumulation_steps 8 \
    --evaluation_strategy "no" \
    --save_strategy "steps" \
    --save_steps 100 \
    --save_total_limit 10 \
    --learning_rate 3e-4 \
    --weight_decay 0.01 \
    --adam_beta2 0.95 \
    --warmup_ratio 0.01 \
    --lr_scheduler_type "cosine" \
    --logging_steps 1 \
    --report_to "none" \
    --model_max_length 512 \
    --gradient_checkpointing \
    --dataloader_num_workers 4 \
    --dataloader_prefetch_factor 10 \
    --deepspeed ds_config_zero3.json

Decoding

python recognize.py \
    --llm_model_name_or_path Qwen2-1.5B-Instruct \
    --whisper_model_name_or_path tiny \
    --projector_model_path Qwen-1.5B-Instruct-whisper-tiny/checkpoint-600/model.safetensors \
    --data_path test.jsonl \
    --result_path result.txt

Results

LibriSpeech(TODO)

AIShell

Different LLM

Exp	LLM	Speech Encoder	Projector	CER
1	QWen2 0.5B	Whisper Large 1.5G	Conv1d 12.07M	9.77
2	QWen2 1.5B	Whisper Large 1.5G	Conv1d 13.32M	7.45
3	QWen2 7B	Whisper Large 1.5G	Conv1d 17.32M	5.55

Different Speech Encoder

Exp	LLM	Speech Encoder	Projector	CER
1	QWen2 1.5B	Whisper tiny 39M	Conv1d 4.5M	35.82
2	QWen2 1.5B	Whisper small 244M	Conv1d 7.3M	12.41
3	QWen2 1.5B	Whisper Large 1.5G	Conv1d 13.32M	7.45

Training Loss

Different Decoding Beam

Based on QWen2 1.5B + Whisper Large 1.5G.

beam_size	1	3	5	8	10
CER	7.45	6.82	6.84	6.83	6.87