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TensorRT integration required us to add a number of third party code sub-repositories to the project.  This is not ideal for users who would like to checkout and build MXNet without using the TensorRT feature.  In the future we should migrate the feature to be CMake only, and checkout the project at pre-compilation time to avoid forcing all users to checkout these subrepos.  We can also model these dependencies using CMake such that they're automatically built and linked against when required, which would make building from scratch easier for those that do want to use TensorRT integration.

Make use of Cached TRT Engines

Similar to the cudnn auto-tuning feature we've received requests from users that we cache TensorRT engine compilations so that we avoid the delay of building the engine each time we start the process.

Increased Operator (/Layer) Coverage

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