Encountered an error while loading tensorflow savedmodel

[Whitessky]

While TRTIS loading tensorflow savedmodel,an error occurred like this:
Loading servable: {name: road-tensorflow version: 1} failed: Not found: Op type not registered 'PyFunc' in binary running on efa5e12b876b. Make sure the Op and Kernel are registered in the binary running in this process. Note that if you are loading a saved graph which used ops from tf.contrib, accessing (e.g.) tf.contrib.resamplershould be done before importing the graph, as contrib ops are lazily registered when the module is first accessed.
what did it mean and what should i do? thanks!

[deadeyegoodwin]

It looks like your model requires a custom tensorflow operation. That operation is implemented by wrapping a python function. See https://www.tensorflow.org/api_docs/python/tf/py_func.
Currently TRTIS does not support custom tensorflow operations. Only operations that are included in the tensorflow build are included. Can you implement the custom functionality using standard TF operations?