Operator request: NotImplementedError: Unsupported TFLite OP: 83 PACK!

[bleachman08]

Note: Currently, we only accept TensorFlow Lite builtin operators request.

What is the TensorFlow Lite operator you need
(Please attach a tiny TFLite model *.tflite, which contains the operator you need ONLY.)

NotImplementedError: Unsupported TFLite OP: 83 PACK!

What kind of service you are trying to deploy your model?
PYNQ platform, I need to convert it to ONNX form

Would you like to contribute the operator?

Additional context
Add any other context about the problem here.