* update train.py

* update post_quantization.py

* add background replace

* update optical flow

* update humanseg_postprocess

* update humanseg_postprocess

* add background replace doc

* Update video_infer.py

* Update bg_replace.py
Co-authored-by: Nwuzewu <wuzewu@baidu.com>

remove the useless third_party library from C++ inference library(zlib, eigen3, boost).  (reference https://github.com/PaddlePaddle/Paddle/pull/22021) (#272)
Co-authored-by: N陈亮 <chenliang@daheng-image.com>

* modify label tool

Co-authored-by: N陈亮 <chenliang@daheng-image.com>

* update model save load

* first add

* update model save and load

* update train.py

* update LaneNet model saving and loading

* adapt slim to paddle-1.8

* update distillation save and load

* update nas model save and load

* update model load op

* update utils.py

* update load_model_utils.py

* update model saving and loading

* update copyright

* update palette.py

* update model save load

* first add

* update model save and load

* update train.py

* update LaneNet model saving and loading

* adapt slim to paddle-1.8

* update distillation save and load

* update nas model save and load

* update model load op

* update utils.py

* update load_model_utils.py

* update model saving and loading

* update *_batch_size_like ops

* remove the preprocess and postprocess of model exporting