From 23dc63a399228aa3ca88d745e999a30b1d2c6207 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=89=8A=E5=BE=AE=E5=AF=92?= <595666367@qq.com>
Date: Thu, 11 Sep 2025 17:56:50 +0800
Subject: [PATCH] add vqa_inference script (#13)

---
 README.md                |  6 ++++
 scripts/vqa_inference.py | 75 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 81 insertions(+)
 create mode 100644 scripts/vqa_inference.py

diff --git a/README.md b/README.md
index cb9f576..6e6bd17 100644
--- a/README.md
+++ b/README.md
@@ -101,6 +101,12 @@ To generate an open-loop comparison plot, please follow:
 python ./scripts/draw_openloop_plot.py
 ```
 
+To run VQA inference, please follow:
+
+```bash
+python ./scripts/vqa_inference.py
+```
+
 ## 📚 Cite Us
 
 If you find WALL-OSS models useful, please cite:
diff --git a/scripts/vqa_inference.py b/scripts/vqa_inference.py
new file mode 100644
index 0000000..2e0d939
--- /dev/null
+++ b/scripts/vqa_inference.py
@@ -0,0 +1,75 @@
+import torch
+from PIL import Image
+from transformers import AutoProcessor
+
+from wall_x.model.qwen2_5_based.modeling_qwen2_5_vl_act import Qwen2_5_VLMoEForAction
+
+
+class VQAWrapper(object):
+    def __init__(self, model_path: str):
+        self.device = self._setup_device()
+        self.processor = self._load_processor(model_path)
+        self.model = self._load_model(model_path)
+
+    def _setup_device(self) -> str:
+        if torch.cuda.is_available():
+            return "cuda"
+        else:
+            return "cpu"
+
+    def _load_processor(self, model_path: str) -> AutoProcessor:
+        return AutoProcessor.from_pretrained(model_path, trust_remote_code=True)
+
+    def _load_model(self, model_path: str) -> Qwen2_5_VLMoEForAction:
+        model = Qwen2_5_VLMoEForAction.from_pretrained(model_path)
+        if self.device == "cuda":
+            model = model.to(self.device, dtype=torch.bfloat16)
+        else:
+            model.to(self.device)
+        model.eval()
+        return model
+
+    def generate(self, image: Image.Image, text: str, **kwargs) -> str:
+        messages = [{"role": "user", "content": [{"type": "image"}, {"type": "text", "text": text}]}]
+        text_prompt = self.processor.apply_chat_template(
+            messages, tokenize=False, add_generation_prompt=True
+        )
+        inputs = self.processor(text=[text_prompt], images=[image], return_tensors="pt")
+        inputs = {k: v.to(self.device) for k, v in inputs.items()}
+
+        generation_params = {
+            "max_new_tokens": 1024, # default value, can be overridden by kwargs
+            "do_sample": False,
+            "eos_token_id": self.processor.tokenizer.eos_token_id,
+            "pad_token_id": self.processor.tokenizer.pad_token_id,
+            **kwargs
+        }
+
+        with torch.no_grad():
+            generated_ids = self.model.generate(**inputs, **generation_params)
+
+        generated_ids = [
+            output_ids[len(input_ids):] for input_ids, output_ids in zip(inputs['input_ids'], generated_ids)
+        ]
+        response = self.processor.batch_decode(
+            generated_ids, skip_special_tokens=True, clean_up_tokenization_spaces=False
+        )[0]
+        return response
+
+
+if __name__ == "__main__":
+    MODEL_PATH_FOR_MODULE_TEST = "/path/to/model"
+    wrapper = VQAWrapper(model_path=MODEL_PATH_FOR_MODULE_TEST)
+
+    try:
+        test_image_url = "https://www.ilankelman.org/stopsigns/australia.jpg"
+        test_question = "What is written on the sign?"
+
+        # img = Image.open("/path/to/your/local/image.jpg").convert("RGB")
+        import requests
+        img = Image.open(requests.get(test_image_url, stream=True).raw).convert("RGB")
+        answer = wrapper.generate(img, test_question)
+
+        print("model answer:", answer)
+    except Exception as e:
+        print(f"model answer fail: {e}")
\ No newline at end of file