Audio8-ASR-0.1B

Audio8-ASR-0.1B is a compact autoregressive ASR model whose language-model component has only 0.1B parameters. It supports multilingual speech recognition for languages including Chinese, English, French, German, Japanese, Korean, and Cantonese. We position it as one of the smallest usable performance ASR models in the LLM era.

This base repository provides the Hugging Face Transformers checkpoint. We also provide deployment-focused releases:

• Audio8-ASR-0.1B-onnx-runtime
• Audio8-ASR-0.1B-iOS-ANE

The ONNX Runtime release is designed for edge-device deployment and can run with roughly 1.1 GB peak memory footprint, depending on device, runtime configuration, and workload.

The iOS release is designed for local iPhone transcription with roughly 200 MB peak runtime memory footprint, depending on device, iOS version, and workload.

Evaluation Results

Evaluation suite	Dataset / split	Language	Metric	Score (%)
Open ASR Leaderboard	AMI Cleaned	EN	WER	11.02
Open ASR Leaderboard	Earnings22	EN	WER	12.31
Open ASR Leaderboard	GigaSpeech Cleaned	EN	WER	8.49
Open ASR Leaderboard	LibriSpeech test.clean	EN	WER	2.70
Open ASR Leaderboard	LibriSpeech test.other	EN	WER	6.61
Open ASR Leaderboard	SPGISpeech	EN	WER	3.73
Open ASR Leaderboard	VoxPopuli Cleaned AA	EN	WER	4.34
Open ASR Leaderboard	Seven-split mean	EN	WER	7.03
Internal canonical ASR eval	WenetSpeech meeting	ZH	CER	8.842
Internal canonical ASR eval	WenetSpeech net	ZH	CER	7.976

The Open ASR results use the seven current public splits from hf-audio/open-asr-leaderboard at dataset revision b6bdcd0beb34f8975dc659796176d88f43aff502. They were measured with the standalone Transformers package using BF16, eager attention, greedy singleton decoding, max_new_tokens=256, and the documented 30-second audio cap. The corresponding machine-readable results are provided in .eval_results/open_asr_leaderboard.yaml.

The internal canonical WenetSpeech results come from the reproducibility-checked teacher0p6B-step3000 export with batch size 128. Its effective model tensors are byte-identical to this standalone release; the release only removes a redundant tied LM-head tensor and packages the same weights for standalone use. Chinese results are reported as character error rate. AISHELL is intentionally excluded from this table.

Model Overview

• Task: automatic speech recognition
• Checkpoint format: safetensors
• Sampling rate: 16 kHz
• Decoder: 8-layer Qwen-style causal LM
• Audio front end: Qwen3-ASR audio encoder plus MLP adapter/projector
• Language-model parameters: 103,502,336 (about 0.104B)
• End-to-end unique parameters: 323,990,528 (about 0.324B)
• Runtime: Hugging Face Transformers
• Hotwords: optional decode-time logit boosting, no fine-tuning required

The model should be loaded with trust_remote_code=True.

Files

• config.json, tokenizer files, processor files, and model.safetensors
• configuration_arkasr.py, modeling_arkasr.py, processing_arkasr.py
• qwen3_asr_audio_config.py, qwen3_asr_audio_model.py
• hotword/: backend-agnostic hotword trie
• examples/: Transformers inference examples

The root config.json is intentionally kept in this repository so Hugging Face can recognize the model package and count downloads through normal model-file queries.

Transformers Inference

import torch
from transformers import AutoModelForCausalLM, AutoProcessor


model_path = "AutoArk-AI/Audio8-ASR-0.1B"
audio_path = "path/to/audio.wav"

device = "cuda" if torch.cuda.is_available() else "cpu"
torch_dtype = torch.bfloat16 if device == "cuda" else torch.float32

processor = AutoProcessor.from_pretrained(model_path, trust_remote_code=True)
model = AutoModelForCausalLM.from_pretrained(
    model_path,
    trust_remote_code=True,
    torch_dtype=torch_dtype,
    attn_implementation="eager",
).to(device)
model.eval()

conversation = [
    {
        "role": "user",
        "content": [
            {"type": "audio", "path": audio_path},
            {"type": "text", "text": "Please transcribe this audio."},
        ],
    }
]

batch = processor.apply_chat_template(
    conversation,
    return_tensors="pt",
    sampling_rate=16000,
    audio_padding="longest",
    add_generation_prompt=True,
    audio_max_length=30 * 16000,
    text_kwargs={"padding": "longest", "truncation": True, "max_length": 1000},
)
batch = {key: value.to(device) if hasattr(value, "to") else value for key, value in dict(batch).items()}

with torch.inference_mode():
    output_ids = model.generate(**batch, max_new_tokens=128, do_sample=False)

prompt_len = int(batch["input_ids"].shape[1])
text = processor.decode(output_ids[0, prompt_len:], skip_special_tokens=True).strip()
print(text)

Equivalent script:

python examples/transcribe.py path/to/audio.wav --model AutoArk-AI/Audio8-ASR-0.1B

For local staging before upload:

python examples/transcribe.py path/to/audio.wav --model .

Hotword Boosting

Hotwords are applied at decode time by nudging logits for tokenizer paths that match the requested words. This does not modify model weights and does not inject the hotwords into the prompt.

python examples/transcribe_hotword.py path/to/audio.wav \
  --model AutoArk-AI/Audio8-ASR-0.1B \
  --hotwords "Audio8,AutoArk"

Main knobs:

• --hotword_topk: only boost tokens already inside the current top-k logits.
• --hotword_start_boost: boost for the first token of each hotword.
• --hotword_continuation_boost: boost for continuation tokens after a matched prefix.

Related Releases

• ONNX Runtime package
• iOS ANE package

Limitations

• The default examples target short-form ASR and truncate audio at 30 seconds.
• Hotword boosting can help with near-miss terms but can also over-bias decoding when boost values are too high.
• Some Transformers/tokenizers versions emit a Qwen tokenizer regex warning. The staged tokenizer config is kept in the loadable form used by this package; pass explicit tokenizer regex flags only after testing your local Transformers version.

Acknowledgements

The audio encoder backbone is based on Qwen3-ASR-0.6B, with the audio adapter and projector trained as part of Audio8-ASR. The language-model backbone is based on Ref-Pretrain-Qwen-104M.