lemura-arabic-asr-qwen3

Lemura Labs' Arabic-first generative speech-recognition model — dialect-broad, production-oriented.

Built for the dialects your users actually speak.

Overview · Benchmarks · Transformers · ms-swift · Entity Biasing · Sibling model

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What it is

lemura-arabic-asr-qwen3 is an Arabic-first generative speech-recognition model. It recasts transcription as audio-conditioned next-token prediction — an audio encoder feeding a Qwen3 language-model decoder, rather than a CTC or transducer objective — so it resolves ambiguity with linguistic context, not acoustics alone.

Fine-tuned from Qwen/Qwen3-ASR-1.7B, it transcribes Modern Standard Arabic and five major dialect groups — Gulf/Khaleeji, Egyptian, Levantine, Iraqi and Maghrebi/Darija — in a single compact 1.7B model.

• Audio-LLM architecture — generative ASR; context disambiguates where acoustics cannot.
• Genuinely multi-dialect — MSA plus five dialect groups, including Moroccan Darija, which most ASR systems handle badly.
• Entity and name biasing — accepts a guiding word-list to lock in brands, people and jargon.
• Robust to code-switching — Arabic ↔ English, common in Gulf business speech.

Built for the hard part of Arabic ASR: real dialectal speech, code-switching, and named entities.

Model summary

Benchmarks

Open Universal Arabic ASR Leaderboard — full standings

Per-dataset WER % across all six leaderboard test sets, zero-shot. Lower is better; Avg WER is the ranking metric. Our sibling model lemura-arabic-asr-lite is evaluated here with the official leaderboard code; this model's base, Qwen/Qwen3-ASR-1.7B, is row 12.

Competitor rows are the published Open Universal Arabic ASR Leaderboard standings, reproduced for context; they are not our measurements. Casablanca (Moroccan Darija) is the hardest set for every system.

Transformers inference

The full-precision bf16 weights are published at the repo root (safetensors). Qwen3-ASR is supported natively in recent Transformers — no trust_remote_code needed.

# pip install "transformers>=4.57.6" torch librosa
import torch, librosa
from transformers import AutoProcessor, Qwen3ASRForConditionalGeneration

repo = "lemuralabs/lemura-arabic-asr-qwen3"
processor = AutoProcessor.from_pretrained(repo)
model = Qwen3ASRForConditionalGeneration.from_pretrained(
    repo, dtype=torch.bfloat16, device_map="auto"
).eval()

audio, _ = librosa.load("clip.wav", sr=16_000)          # 16 kHz mono

messages = [{"role": "user", "content": [{"type": "audio", "audio": audio}]}]
text = processor.apply_chat_template(messages, tokenize=False, add_generation_prompt=True)
inputs = processor(text=text, audio=audio, sampling_rate=16_000, return_tensors="pt").to(model.device)

out = model.generate(**inputs, max_new_tokens=256, do_sample=False)
print(processor.batch_decode(out[:, inputs["input_ids"].shape[1]:], skip_special_tokens=True)[0])

ms-swift inference

For batch transcription over a dataset, ms-swift is the fastest path:

pip install ms-swift transformers==4.57.6 qwen-asr soundfile
swift infer \
  --model lemuralabs/lemura-arabic-asr-qwen3 \
  --val_dataset your_data.jsonl \
  --infer_backend pt --max_new_tokens 256

Dataset JSONL, one line per clip, audio 16 kHz mono:

{"messages": [{"role": "user", "content": "<audio>"}, {"role": "assistant", "content": ""}], "audios": ["/path/to/clip.wav"]}

Entity and name biasing

Pass a short guiding word-list as a system message to lock in names, brands and jargon:

{"messages": [
  {"role": "system", "content": "الكلمات المرشدة: أبوبي، موهان، لمُرا"},
  {"role": "user", "content": "<audio>"},
  {"role": "assistant", "content": ""}],
 "audios": ["/path/to/clip.wav"]}

This alone fixes most brand and name errors in real business audio.

Notes

• Long audio: the audio encoder uses a 30 s window (chunk_length: 30); chunk longer inputs client-side and concatenate the transcripts.
• Sample rate: input must be 16 kHz mono; resample before inference.
• Decoding: greedy (do_sample=False) is recommended for transcription; sampling adds hallucination risk.
• Precision: weights are bf16; fp16 works on older GPUs, but bf16 is what the model was trained and merged in.

Languages, dialects and tasks

• Primary: Arabic — MSA and dialectal (Gulf/Khaleeji, Egyptian, Levantine, Iraqi, Maghrebi/Darija), plus code-switched Arabic–English; emits dialect-faithful orthography from audio alone.
• Task: transcription (audio → UTF-8 text), optionally steered by a guiding word-list for entities.
• Audio: 16 kHz mono, 30 s window.

Intended use and limitations

Intended use. Transcribing Arabic speech across dialects — contact centres, voice notes, media captioning, voice agents and accessibility, especially Gulf and Maghrebi deployments; cloud or on-prem.

Limitations.

• Best on the dialects and domains it covers; fully unseen accents or domains will be harder.
• Maghrebi / Moroccan Darija remains the hardest condition, as it is for every system.
• Very noisy or far-field audio degrades accuracy; long recordings must be chunked.
• Not evaluated for, and must not be used for, covert speaker identification.
• May reflect biases present in the training corpora.

Related model

lemura-arabic-asr-lite — ~115M-parameter FastConformer-CTC, CPU and real-time capable, #2 of 36 zero-shot on the Open Universal Arabic ASR Leaderboard.

License

Apache-2.0, inheriting the base model's license. Please also respect the licenses of the training datasets.

Citation

@misc{lemura_arabic_asr_qwen3_2026,
  title  = {lemura-arabic-asr-qwen3: Generative Multi-Dialect Arabic Speech Recognition},
  author = {Lemura Labs},
  year   = {2026},
  url    = {https://huggingface.co/lemuralabs/lemura-arabic-asr-qwen3}
}

Acknowledgements

• Base model: Qwen/Qwen3-ASR-1.7B (Alibaba Qwen team)
• Evaluation: the Open Universal Arabic ASR Leaderboard official code

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About Lemura Labs

Arabic-first, efficiency-first speech intelligence.

Lemura Labs starts with the dialects people actually speak.

We build compact, deployable speech and language models — accuracy at a size and cost that works outside the datacentre. Our work spans speech recognition, dialectal language modelling, and efficient inference for real-world deployment, from edge devices to on-prem clusters.

Dialect-first. Efficient by design. Built to deploy.

© 2026 Lemura Labs · Licensed under Apache-2.0