Update app.py

app.py

@@ -30,7 +30,7 @@ urllib.request.urlretrieve(url, filename=path_input)
 file = tarfile.open(fileobj=response.raw, mode="r|gz")
 file.extractall(path="./nst_model")
 '''
-MODEL_PATH='Nst model'
+MODEL_PATH='Nst_model'
 
 # Disable scientific notation for clarity
 np.set_printoptions(suppress=True)