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XinNUS
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Model Details
Model Provider
XinNUS
Model Tree
zhouyik/Qwen3-VL-4B-SAMTok
Input Modalities
Output Modalities
Supported Functionality
CycleGRPO-4B is a Qwen3-VL-4B that emits SAMTok mask tokens (<|mt_...|>). Plain
text generation works with 🤗 Transformers directly; turning the mask tokens into
segmentation masks needs the VQ-SAM2 decoder from the CycleGRPO repo
(projects.transformers.vq_sam2), so clone and install it first:
bash
pip install "transformers>=4.57"git clone https://github.com/devinxzhang/CycleGRPO.gitcd CycleGRPO # run from the repo root so `projects.transformers.vq_sam2` importspip install -e .
python
import torchfrom transformers import Qwen3VLForConditionalGeneration, AutoProcessormodel_id = "XinNUS/CycleGRPO-4B"model = Qwen3VLForConditionalGeneration.from_pretrained(model_id, dtype="auto", device_map="auto").eval()processor = AutoProcessor.from_pretrained(model_id)messages = [{"role": "user","content": [{"type": "image", "image": "figs/totoro.jpg"},{"type": "text", "text": "Describe the image with interleaved segmentation ""masks for the corresponding parts of the answer."},],}]inputs = processor.apply_chat_template(messages, tokenize=True, add_generation_prompt=True,return_dict=True, return_tensors="pt",).to(model.device)out = model.generate(**inputs, max_new_tokens=512, do_sample=False)text = processor.batch_decode(out[:, inputs["input_ids"].shape[1]:], skip_special_tokens=True)[0]print(text) # answer text interleaved with <|mt_start|><|mt_XXXX|><|mt_YYYY|><|mt_end|> mask tokens
The <|mt_...|> tokens are decoded to masks by the VQ-SAM2 mask tokenizer. Use the
reference implementation in the CycleGRPO repo rather than re-deriving it — see
evaluation/groundingsuite/qwen3vl_groundingsuite_infer.py (or
evaluation/dlc_bench/inference.py), which build the decoder and run the decode loop:
python
from projects.transformers.vq_sam2 import VQ_SAM2, VQ_SAM2Config, SAM2Config# Those scripts also contain the `DirectResize` preprocessor, the mt-token parsing# (extract_mt_token_ids / fix_mt_format), and the `VQ_SAM2.forward_with_codes(...)`# decode step (codebook size 256, depth 2). Reuse them directly.
The decoder weights — mask_tokenizer_256x2.pth and sam2.1_hiera_large.pt — come
from the base model Qwen3-VL-4B-SAMTok.
Released under Apache-2.0. Derived from Qwen3-VL-4B-SAMTok; use is also subject to the base model's license and terms.