Update app.py

app.py

@@ -4,7 +4,7 @@ import onnx
 from VitsModelSplit.vits_model_only_d import  Vits_models_only_decoder
 from VitsModelSplit.vits_model import VitsModel
 import gradio as gr
-
+import os
 class OnnxModelConverter:
     def __init__(self):
         self.model = None