Update app.py

app.py

@@ -1,7 +1,7 @@
 import os
 os.system("pip install torch torchvision")
 os.system("git clone https://github.com/IDEA-Research/detrex.git")
-# os.system("python -m pip install git+https://github.com/facebookresearch/[email protected]#egg=detectron2")
+os.system("python -m pip install git+https://github.com/facebookresearch/[email protected]#egg=detectron2")
 os.system("python -m pip install git+https://github.com/IDEA-Research/[email protected]#egg=detrex")
 os.system("git submodule sync")
 os.system("git submodule update --init")