* add preprocess and argmax to export process

* add comments

* modify label tool

* support color label

* vis and check support colorful label

* remove needless modification

* remove needless get_color_map_list

* supprt tensorboard

* modify annotation stript path

* add hrnet

Update readme feature

Modify inference lib link

modify the inference lib link

* modify annotation stript path

using 'cpplint --filter=-build/include_subdir,-build/c++11' to check cpp code style of all *.h, *.cpp

add copyright

Add mechanical meter to contrib