Qwen3-VL-8B-Thinking-FP8

import time
from PIL import Image
from sglang import Engine
from qwen_vl_utils import process_vision_info
from transformers import AutoProcessor, AutoConfig

if __name__ == "__main__":
    # TODO: change to your own checkpoint path
    checkpoint_path = "Qwen/Qwen3-VL-8B-Thinking-FP8"
    processor = AutoProcessor.from_pretrained(checkpoint_path)

    messages = [
        {
            "role": "user",
            "content": [
              {
                  "type": "image",
                  "image": "https://qianwen-res.oss-accelerate.aliyuncs.com/Qwen3-VL/receipt.png",
              },
              {"type": "text", "text": "Read all the text in the image."},
            ],
        }
    ]

    text = processor.apply_chat_template(
        messages,
        tokenize=False,
        add_generation_prompt=True
    )

    image_inputs, _ = process_vision_info(messages, image_patch_size=processor.image_processor.patch_size)

    llm = Engine(
        model_path=checkpoint_path,
        enable_multimodal=True,
        mem_fraction_static=0.8,
        tp_size=torch.cuda.device_count(),
        attention_backend="fa3"
    )

    start = time.time()
    sampling_params = {"max_new_tokens": 1024}
    response = llm.generate(prompt=text, image_data=image_inputs, sampling_params=sampling_params)
    print(f"Response costs: {time.time() - start:.2f}s")
    print(f"Generated text: {response['text']}")