Update app.py

app.py

@@ -61,6 +61,7 @@ def inference(re_im, session, onnx_model, input_names, output_names):
     output_audio = torch.tensor(np.concatenate(output_audio, 0))
     output_audio = output_audio.permute(1, 0, 2).contiguous()
     output_audio = torch.view_as_complex(output_audio)
+    output_audio = output_audio.detach().numpy()
     output_audio = torch.istft(output_audio, window, stride, window=hann)
     return output_audio.numpy()