AnomalyThink-Qwen3-VL-8B-SFT

AnomalyThink-Qwen3-VL-8B-SFT

Qwen3-VL-8B fine-tuned on the 6,000 AnomalyThink traces (supervised only). DS-MVTec 80.31 / VisA 67.32.

Post-submission research artefact. The thesis reports Qwen3-VL-8B only as a corpus-transfer check (base 78.68 / 64.45, trained on the Qwen2.5-VL KCR corpus 85.82 / 76.45, Table 6.13). The three Qwen3-VL-8B models in this family (AnomalyThink-Qwen3-VL-8B-SFT, AnomalyThink-Qwen3-VL-8B-SFT-GRPO, AnomalyThink-Qwen3-VL-8B-KCR) were trained after the thesis was submitted, in September 2026, by running the thesis recipe end to end on this backbone. They are not thesis results and are released for reproducibility.

Results (MMAD subsets, balanced accuracy, strict scoring)

Evaluation protocol. One harness for every row: the DS-MVTec (1,670 images) and VisA (2,141 images) subsets of MMAD, one image per prompt, the training prompt with the one-line system message "Please answer by yes or no", greedy decoding, at most 1,024 new tokens, images capped at 262,144 pixels, vLLM generation. Balanced accuracy is the mean of sensitivity and specificity. Strict scoring: a generation with no parsable <answer> counts as wrong. Per-sample evaluation files are next to the weights (eval_*.json).

The pattern of the thesis reproduces on this backbone: GRPO carries DS-MVTec, and the corrected corpus built from the GRPO policy's rollouts carries VisA, where 76.63 is the highest VisA score of any model trained in the project.

Training

• Base: Qwen/Qwen3-VL-8B-Instruct. Corpus: anomalythink_6k/combined_6k_train.json of aacudad/AnomalyThink, the same 6,000 Gemini 2.5-Flash traces (3,000 anomalous, 3,000 normal, 30 Real-IAD products, top-down view) used for the thesis Qwen2.5-VL SFT.
• Recipe: full fine-tuning of the language model and projector, vision encoder frozen, learning rate 1e-5, cosine schedule with 20 warmup steps, effective batch size 32 on two RTX A6000 (DeepSpeed ZeRO-3 with CPU offload), images capped at 262,144 pixels, bf16, 4 epochs. This is epoch 1 (step 188), the DS-MVTec-best epoch; the four epochs scored 80.31 / 67.32, 77.61 / 67.50, 78.07 / 62.91 and 79.41 / 62.35.

What Keep-Correct-Revise (KCR) means

An SFT plus GRPO policy is sampled eight times on every training image. A trace is kept when the verdict is right and a Gemini-3-Flash judge finds the reasoning grounded, corrected by the teacher when every rollout was wrong, and revised by the teacher when the verdict was right but the reasoning was weakly grounded. A fresh model is then fine-tuned from the base weights on the curated corpus, so the final model is supervised and the reinforcement-learned policy is the source of its training data.

Usage

The checkpoint was saved with transformers 5.0.0 and loads directly with transformers>=5.0:

from transformers import AutoProcessor, AutoModelForImageTextToText
import torch
repo = "aacudad/AnomalyThink-Qwen3-VL-8B-SFT"
processor = AutoProcessor.from_pretrained(repo)
model = AutoModelForImageTextToText.from_pretrained(repo, torch_dtype=torch.bfloat16, device_map="auto")
msgs = [{"role": "system", "content": "Please answer by yes or no"},
        {"role": "user", "content": [{"type": "image", "image": "part.jpg"},
         {"type": "text", "text": "Analyze the provided image of the pcb. Determine if there are any anomalies present. If an anomaly is detected, specify its type and location, and provide a detailed reasoning for your conclusion."}]}]
inputs = processor.apply_chat_template(msgs, add_generation_prompt=True, tokenize=True, return_dict=True, return_tensors="pt").to(model.device)
out = model.generate(**inputs, max_new_tokens=1024, do_sample=False)
print(processor.decode(out[0][inputs["input_ids"].shape[1]:], skip_special_tokens=True))

The output is <think>...</think> followed, for anomalies, by <location>, <type> and <answer>Yes</answer>, or <answer>No</answer> for a normal part. For transformers 4.57 or vLLM 0.10.x use the files in transformers4_vllm/ (the stock Qwen3-VL-8B-Instruct tokenizer and processor files and a config with rope_theta written into text_config) next to model.safetensors; this is how every number above was produced.

Intended use and limitations

Research artefact for explainable industrial anomaly detection on top-down product images. Single seed, no human evaluation of the explanations, selection on DS-MVTec with VisA reported at the same checkpoint. The public benchmark images may have been seen during backbone pretraining, which cannot be ruled out for any model in this comparison.

Citation

@mastersthesis{acudad2026reasoning,
  author  = {Acudad, A.},
  title   = {Reasoning-Enhanced Vision-Language Models for Explainable Industrial Anomaly Detection},
  school  = {Delft University of Technology},
  year    = {2026},
  type    = {Master's thesis},
  url     = {https://resolver.tudelft.nl/uuid:65c62420-79c0-447f-b095-7fb11d4474fc}
}

Thesis: https://resolver.tudelft.nl/uuid:65c62420-79c0-447f-b095-7fb11d4474fc. Code and evaluation files: https://github.com/aacudad/IAD-VLMs.

License

Apache-2.0, derived from Qwen/Qwen3-VL-8B-Instruct.