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

* add cluster running

* add k8s/paddle cloud

* fix local cluster without gpu

* define engine to train/infer/local_cluster_train/cluster_train

* fix gpu cluster wait

* fix bug for 2ps 2tr
Co-authored-by: Ntangwei <tangwei12@baidu.com>