Create a network definition from scratch by TensorRT

[daohu527]

Reference topic create-network-def-scratch

The advantage of using tensorRT directly to create a network is to avoid the problems of different onnx exports.

• model -> onnx -> TensorRT
• model -> TensorRT

solution

INetworkDefinition

Existing network types are added through addxx, and custom types are added through addPluginV2.

• addConvolution, addFullyConnected ...
• addPluginV2