* refactor eager flags

* fix flags error when we switch from eager to dygraph

* fix ci problem

* fix ci

* fix ci

* merge develop and fix code style

* merge develop and fix code style

* fix op test error

* fix op test error

* fix op test error

* fix op test error

* fix op test error

* merge develop

* cache core.ops, test=develop

* refine, test=develop

* update 2.0 public api in all left files

* reverse device.py all list;
fix some flake8 errors

* test=develop, add model_average and lookahead