Update app.py

app.py

@@ -1,3 +1,6 @@
+import os
+os.system("pip install 'git+https://github.com/facebookresearch/detectron2.git'")
+
 import gradio as gr
 import torch
 import numpy as np
@@ -6,6 +9,9 @@ from detectron2.engine import DefaultPredictor
 from detectron2.config import get_cfg
 from detectron2 import model_zoo
 from detectron2.utils.visualizer import Visualizer, ColorMode
+from detectron2.data import MetadataCatalog
+
+
 
 # set Detectron2 
 cfg = get_cfg()