init for demo

Change-Id: I6dae178e7087968dd60dafb4a76f22c01daa4cad

app.py

@@ -11,7 +11,6 @@ os.system("pip install git+https://github.com/cocodataset/panopticapi.git")
 
 import gradio as gr
 # check pytorch installation: 
-import detectron2
 from detectron2.utils.logger import setup_logger
 from contextlib import ExitStack
 # import some common libraries
@@ -20,9 +19,8 @@ import cv2
 import torch
 import itertools
 # import some common detectron2 utilities
-from detectron2 import model_zoo
 from detectron2.config import get_cfg
-from detectron2.utils.visualizer import Visualizer, ColorMode, random_color
+from detectron2.utils.visualizer import ColorMode, random_color
 from detectron2.data import MetadataCatalog
 from detectron2.projects.deeplab import add_deeplab_config