* add save model for step

* add PS/Collective support , add definition in yaml.md

* add check for QueueDataset while saving by step, modify dnn config yaml as an example

* add logging about model save operation

* fix bug for adding check for QueueDataset, modify dnn config yaml

* fix bug for dnn model config yaml

* fix bug for checking QueueDataset

* fix UT fail

* fix UT fail
Co-authored-by: Ntangwei12 <tangwei12@baidu.com>

* fix demo

* fix

* fix

* fix code style

* add textcnn_pretrain

* add textcnn_pretrain

* change classification to textcnn

* add readme in paddlerec

* fix esmm

* fix esmm
Co-authored-by: Nwuzhihua <35824027+fuyinno4@users.noreply.github.com>
Co-authored-by: Ntangwei12 <tangwei12@baidu.com>

Co-authored-by: Ntangwei12 <tangwei12@baidu.com>

Co-authored-by: Ntangwei12 <tangwei12@baidu.com>

* fix mmoe

* fix readme
Co-authored-by: Nwuzhihua <35824027+fuyinno4@users.noreply.github.com>

* add model match-pyramid

* match_pyramid change readme

* add picture
Co-authored-by: Ntangwei12 <tangwei12@baidu.com>

* add tagspace model and readme

* change
Co-authored-by: Ntangwei12 <tangwei12@baidu.com>

Co-authored-by: Ntangwei12 <tangwei12@baidu.com>

* add fine tuning trainer

* add doc

* fix
Co-authored-by: NseiriosPlus <tangwei12@baidu.com>
Co-authored-by: Nwuzhihua <35824027+fuyinno4@users.noreply.github.com>

* fix error ASCII

* fix doc error, delete custer reader md

* fix setup.py

* fix install/readme

* fix listwise

* fix travis

* fix readme
Co-authored-by: NseiriosPlus <tangwei12@baidu.com>