Qwen3-4B-Domino-b16

Qwen3-4B Domino Draft Model

Paper | GitHub

This repository contains a Domino/DFlash draft model for speculative decoding with Qwen/Qwen3-4B. The draft model is not intended to be used as a standalone language model; it should be paired with the target model during generation.

Domino keeps draft generation block-parallel while adding a lightweight causal correction head. This preserves the low drafting cost of parallel speculative decoding and improves draft-token acceptance.

Model Details

• Target model: Qwen/Qwen3-4B
• Draft model: Huang2020/Qwen3-4B-Domino-b16
• Block size: 16
• Recommended usage: one GPU for the direct spec_generate path
• Qwen3 chat setting: thinking mode disabled

Quick Usage

from transformers import AutoModel, AutoModelForCausalLM, AutoTokenizer

draft_model = AutoModel.from_pretrained(
    "Huang2020/Qwen3-4B-Domino-b16",
    trust_remote_code=True,
    dtype="auto",
    device_map="cuda:0",
).eval()

target_model = AutoModelForCausalLM.from_pretrained(
    "Qwen/Qwen3-4B",
    dtype="auto",
    device_map="cuda:0",
).eval()

tokenizer = AutoTokenizer.from_pretrained("Qwen/Qwen3-4B")
prompt = "How many positive whole-number divisors does 196 have?"
messages = [{"role": "user", "content": prompt}]

text = tokenizer.apply_chat_template(
    messages,
    tokenize=False,
    add_generation_prompt=True,
    enable_thinking=False,
)
model_inputs = tokenizer([text], return_tensors="pt").to(draft_model.device)

output_ids = draft_model.spec_generate(
    input_ids=model_inputs["input_ids"],
    target=target_model,
    max_new_tokens=2048,
    temperature=0.0,
    stop_token_ids=[tokenizer.eos_token_id],
)

generated_ids = output_ids[:, model_inputs["input_ids"].shape[1]:]
print(tokenizer.decode(generated_ids[0], skip_special_tokens=True))

Benchmark Figure

The source PDF is available at assets/speedup.pdf.

Citation

@article{huang2026domino,
  title={Domino: Decoupling Causal Modeling from Autoregressive Drafting in Speculative Decoding},
  author={Huang, Jianuo and Zhang, Yaojie and Zhang, Qituan and Lin, Hao and Xu, Hanlin and Zhang, Linfeng},
  journal={arXiv preprint arXiv:2605.29707},
  year={2026}
}