Update app.py

app.py

@@ -8,7 +8,7 @@ class ONNXModel:
     def __init__(self, dir_path) -> None:
         """Method to get name of model file. Assumes model is in the parent directory for script."""
         model_dir = os.path.dirname(dir_path)
-        with open(os.path.join(model_dir, "signature.json"), "r") as f:
+        with open(os.path.join(model_dir, "/signature.json"), "r") as f:
             self.signature = json.load(f)
         self.model_file = os.path.join(model_dir, self.signature.get("filename"))
         if not os.path.isfile(self.model_file):