Hi, the error is saying if you want to export(serialize) your model to disk, you will need to convert all your models to TorchScript (either via tracing or scripting). Right now your model only have partially converted to TorchScript. For how to convert, here is our doc https://pytorch.org/docs/stable/jit.html 14, I also recommend you to try our new API 12 if you stay on our nightly builds.