Update app.py

app.py

@@ -25,10 +25,12 @@ if "models" in pathlib.Path.cwd().parts:
 elif not pathlib.Path('models').exists():
   os.system('git clone --depth 1 https://github.com/tensorflow/models')
 os.chdir('models/research/')
-sys.path.append('object_detection/utils')
-import ops as utils_ops
-import label_map_util
-import visualization_utils as vis_utils
+os.system('protoc object_detection/protos/*.proto --python_out=.')
+os.system('cp object_detection/packages/tf2/setup.py .')
+os.system('python -m pip install .')
+from object_detection.utils import ops as utils_ops
+from object_detection.utils import label_map_util
+from object_detection.utils import visualization_utils as vis_utils
 # patch tf1 into `utils.ops`
 utils_ops.tf = tf.compat.v1