Update app.py

app.py

@@ -78,7 +78,8 @@ class OnnxModelConverter:
             opset_version=11,
             input_names=['input'],
             output_names=['output'],
-            dynamic_axes={'input': {0: 'batch_size', 1: 'sequence_length'}, 'output': {0: 'batch_size'}}
+            dynamic_axes={"input": {0: "batch_size", 1: "sequence_length"},
+                                "output": {0: "batch_size", 1: "sequence_length"}})
         )
 
         return  self.download_file(onnx_file)