update import detectron2

app.py

@@ -1,8 +1,8 @@
 from flask import Flask, request, jsonify, render_template
-from detectron2main.config import get_cfg
-from detectron2main.engine import DefaultPredictor
-from detectron2main.data import MetadataCatalog
-from detectron2main.utils.visualizer import Visualizer, ColorMode
+from detectron2.config import get_cfg
+from detectron2.engine import DefaultPredictor
+from detectron2.data import MetadataCatalog
+from detectron2.utils.visualizer import Visualizer, ColorMode
 import numpy as np
 from PIL import Image
 import io