onnx to trt,choose int8 mode

## Description

PyCUDA WARNING: a clean-up operation failed (dead context maybe?)
cuMemFree failed: an illegal memory access was encountered

## Environment

**TensorRT Version**: 8.4.5.1
**GPU Type**: NVIDIA TITAN X
**Nvidia Driver Version**: 
**CUDA Version**: 11.7
**CUDNN Version**: 
**Operating System + Version**: linyx
**Python Version (if applicable)**: 3.8.5



