Update app.py

app.py

@@ -31,7 +31,7 @@ class PaddleOCRModelManager(object):
         self._workers = []
         self._model_initialized_event = Event()
         for _ in range(num_workers):
-            worker = Thread(target=self._worker, daemon=False)
+            worker = Thread(target=self._worker, daemon=True)
             worker.start()
             self._model_initialized_event.wait()
             self._model_initialized_event.clear()