Qwen3.5-9B · AWQ INT4 (W4A16)

4-bit quantization of Qwen/Qwen3.5-9B, produced for efficient vLLM serving. Quantized by axteam.

Base model Qwen/Qwen3.5-9B
Method AWQ INT4 (W4A16)
Format compressed-tensors pack-quantized
Weights / activations W4A16 — INT4 asymmetric weights, group size 32 (BF16 scale + INT4 zero-point), BF16 activations
Architecture Hybrid (linear-attention + full-attention) · Dense · multimodal (vision) · MTP head
Size on disk ~8.8 GB
Calibration 256 samples (Korean-heavy mixed corpus)
License Apache-2.0

Quantization details

  • Scheme — W4A16 — INT4 asymmetric weights, group size 32 (BF16 scale + INT4 zero-point), BF16 activations, stored as compressed-tensors pack-quantized.
  • Kept in BF16 — the vision tower & projector (model.visual.*), the multi-token-prediction head (mtp.*), all RMSNorms, token embeddings, the LM head, the SSM non-linear parts (linear_attn.conv1d/A_log/dt_bias). Left unquantized to preserve quality (a small fraction of parameters).
  • Tokenizer / chat_template / generation_config are identical to the original. config.json is the original plus a quantization_config block.

This is post-training quantization (PTQ) — no retraining, so behaviour stays faithful to the original. AWQ uses a small calibration set (no gradient) to protect salient weight channels before rounding.

Evaluation (measured)

Fidelity to the BF16 original on an internal mixed English/Korean set (100 prompts, BF16 greedy answers scored under each build — same harness for every row).

Metric This model BF16 original
Perplexity (lower = closer) 1.5403 1.4506 (+6.2%)
Top-1 next-token agreement 90.9% 99.2%

These measure fidelity to the base model, not absolute task scores.

Usage (vLLM)

vllm serve axteam/Qwen3.5-9B-AWQ-4bit

Recommended sampling (Qwen): temperature=0.7, top_p=0.8, top_k=20.

License

Quantized derivative of Qwen/Qwen3.5-9B (Apache-2.0). All original weights, tokenizer and chat template belong to the Qwen team.


한국어 요약

Qwen/Qwen3.5-9B 를 AWQ INT4 (W4A16) 로 양자화한 서빙용(4-bit) 모델입니다. 작성: axteam.

  • 방식 — INT4 비대칭, 32개 묶음(BF16 스케일+INT4 영점), 활성화 BF16(W4A16). AWQ로 배율 이동 후 양자화. 형식 compressed-tensors pack-quantized.
  • BF16 유지 — 비전 타워·MTP 헤드·모든 norm·임베딩/LM 헤드·SSM 비선형부(conv1d/A_log/dt_bias).
  • PTQ — 재학습 없음, 원본 동작 유지.
  • 품질(실측) — BF16 원본 대비 perplexity 1.5403(원본 1.4506, +6.2%), top-1 일치도 90.9%(원본 99.2%). 내부 영/한 100문항, 같은 하네스.
  • 사용 — vllm serve axteam/Qwen3.5-9B-AWQ-4bit, 권장 샘플링 temperature=0.7, top_p=0.8, top_k=20.
  • 라이선스 — 원본 Apache-2.0 파생물. 가중치·토크나이저·chat_template 권리는 Qwen 팀.
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