Add support for loading onnx files with the tensorRT backend

[fran6co]

Describe the solution you'd like
Be able to just use an onnx file in the tensorrt backend given that tensorrt has a onnx parser. It would build the engine on warmup and cache it.

Describe alternatives you've considered
Using the onnxruntime backend instead, but it has problems #4587 and microsoft/onnxruntime#11356

[joihn]

I think what you want is already implemented :
https://github.com/triton-inference-server/server/blob/main/docs/optimization.md#onnx-with-tensorrt-optimization-ort-trt

[fran6co]

@joihn ORT is short for onnxruntime, what I'm asking is to use tensorrt with onnxs but without onnxruntime

[yaysummeriscoming]

+1

[jbkyang-nvi]

@tanmayv25 thoughts?

[tanmayv25]

I would not like to complicate TensorRT backend to consume onnx files and own the conversion within TensorRT backend. ORT already support TRT execution provider.

[jbkyang-nvi]

Closing this issue due to lack of activity. If this issue needs follow-up, please let us know and we can reopen it for you.