https://github.com/facebookincubator/AITemplate/wiki/How-to-write-a-fast-Softmax-CUDA-kernel%3F     
https://github.com/NVIDIA/online-softmax/blob/master/online_softmax_benchmark.cu

+ 导出onnx 脚本

+ 插件实现

+ trtexec 性能评测

+ 优化 summary    
