Added handler.py

handler.py

@@ -0,0 +1,88 @@
+import torch
+from transformers import QwenForVisionLanguage, QwenTokenizer, QwenProcessor
+from PIL import Image
+import base64
+import io
+import json
+import cv2
+import numpy as np
+
+class Qwen2VL7bHandler:
+    def __init__(self):
+        # Initialize the model and processor
+        self.model = None
+        self.tokenizer = None
+        self.processor = None
+        self.device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
+
+    def initialize(self, ctx):
+        # Load the model and processor within the inference environment
+        model_dir = ctx.system_properties.get("model_dir")
+        self.model = QwenForVisionLanguage.from_pretrained(model_dir)
+        self.tokenizer = QwenTokenizer.from_pretrained(model_dir)
+        self.processor = QwenProcessor.from_pretrained(model_dir)
+        self.model.to(self.device)
+        self.model.eval()
+
+    def preprocess(self, data):
+        # Process incoming requests and extract video data
+        video_data = data.get('video')
+        if not video_data:
+            raise ValueError("Video data is required")
+        
+        # Decode the base64 video
+        frames = self.extract_frames_from_video(video_data)
+        inputs = self.processor(images=frames, return_tensors="pt").to(self.device)
+        return inputs
+
+    def extract_frames_from_video(self, video_data):
+        # Decode the base64 video data
+        video_bytes = base64.b64decode(video_data)
+        video_array = np.frombuffer(video_bytes, np.uint8)
+        video = cv2.imdecode(video_array, cv2.IMREAD_COLOR)
+        
+        # Capture frames from the video
+        vidcap = cv2.VideoCapture(io.BytesIO(video_bytes))
+        frames = []
+        success, frame = vidcap.read()
+        while success:
+            # Convert the frame from BGR to RGB format
+            frame_rgb = cv2.cvtColor(frame, cv2.COLOR_BGR2RGB)
+            pil_image = Image.fromarray(frame_rgb)
+            frames.append(pil_image)
+            success, frame = vidcap.read()
+
+        return frames
+
+    def inference(self, inputs):
+        # Perform inference on the preprocessed data
+        with torch.no_grad():
+            outputs = self.model(**inputs)
+        return outputs
+
+    def postprocess(self, inference_output):
+        # Convert the model outputs into a format suitable for the response
+        predicted_text = self.tokenizer.decode(inference_output.logits.argmax(-1))
+        return {"result": predicted_text}
+
+    def handle(self, data, context):
+        try:
+            # Deserialize the request data
+            request_data = json.loads(data[0].get("body"))
+            # Preprocess the input data
+            inputs = self.preprocess(request_data)
+            # Perform inference
+            outputs = self.inference(inputs)
+            # Postprocess the output
+            result = self.postprocess(outputs)
+            return [json.dumps(result)]
+        except Exception as e:
+            return [json.dumps({"error": str(e)})]
+
+# Instantiate the handler for use in deployment
+_service = Qwen2VL7bHandler()
+
+def handle(data, context):
+    if not _service.model:
+        _service.initialize(context)
+    return _service.handle(data, context)