TensorRT 6.0 support and PyTorch->ONNX->TRT6 unit test (#26426)
Summary:
This PR makes Caffe2 compatible with TensorRT 6. To make sure it works well, new unit test is added. This test checks PyTorch->ONNX->TRT6 inference flow for all classification models from TorhchVision Zoo.
Note on CMake changes: it has to be done in order to import onnx-tensorrt project. See https://github.com/pytorch/pytorch/issues/18524 for details.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/26426
Reviewed By: hl475
Differential Revision: D17495965
Pulled By: houseroad
fbshipit-source-id: 3e8dbe8943f5a28a51368fd5686c8d6e86e7f693
