Update app.py

app.py

@@ -1,3 +1,9 @@
+import os
+os.system('git clone https://github.com/facebookresearch/detectron2.git')
+os.system('pip install -e detectron2')
+
+import sys
+sys.path.append("detectron2")
 from unilm.dit.object_detection.ditod import add_vit_config
 import torch
 import cv2
@@ -7,12 +13,7 @@ from detectron2.utils.visualizer import ColorMode, Visualizer
 from detectron2.data import MetadataCatalog
 from detectron2.engine import DefaultPredictor
 import gradio as gr
-import os
 
-os.system('git clone https://github.com/facebookresearch/detectron2.git')
-os.system('pip install -e detectron2')
-import sys
-sys.path.append("detectron2")
 
 cfg = get_cfg()
 add_vit_config(cfg)