diff --git a/sahi/model.py b/sahi/model.py
index 8ff9119..e51dbf2 100644
--- a/sahi/model.py
+++ b/sahi/model.py
@@ -1097,6 +1097,10 @@ def load_model(self):
         
     def perform_inference(self, image: np.ndarray):
         img, self.img_shape, self.src_shape = precess_image(image, img_size=self.image_size, stride=self.stride)
+        
+        # move the input tensor to the same device as the model
+        img = img.to(self.device)
+        
         self._original_predictions = self.model(img)
 
     def _create_object_prediction_list_from_original_predictions(
@@ -1120,7 +1124,7 @@ def _create_object_prediction_list_from_original_predictions(
             for *xyxy, conf, cls in reversed(det): 
                 category_id = int(cls)
                 category_name = COCO_CLASSES[category_id]
-                score = float(conf.numpy())
+                score = float(conf.cpu().numpy())
                 bbox = [int(xyxy[0]), int(xyxy[1]), int(xyxy[2]), int(xyxy[3])]
                 object_prediction = ObjectPrediction(
                     bbox=bbox,