* fix bn

* return Maybe<void> OK in lambda

* fix typo

* fix sigmoid op bug

* fix bug for split like op

* add sigmoid grad op

* Refine Infer APIs by return Maybe<void> type

* Fix return type

* Fix code style

* Replace CHECK macros in the implementation of infer APIs

* Revert IsOk

* update

* Refine Infer APIs by return Maybe<void> type

* Fix return type

* Fix code style

* Replace CHECK macros in the implementation of infer APIs

* Revert IsOk

* add more checks

* make language more consistant

* better error info for worker init

* better error

* run max_pool_2d without bug

* correct max_pool_2d

* correct average_pool_2d

* minor refine

* final version

* rename to nn.py

* add name arg to pool1d ops

* refine by review

* check in impl

* add todo

* python_ops gather and unit test

* format

* minor mod

* AssignOp

* remove useless code

* fix data dir

* rm model load path

* Fix tick in multi node parallel (#2042)

* check in fixes

* fix by adding boxing method

* register tick op

* move code and add more check

* fix typo

* fix bug when filtering op nodes before adding tick

* check in impl

* check in fixes

* fix by adding boxing method

* register tick op

* move code and add more check

* fix typo

* fix bug when filtering op nodes before adding tick

* better looking and more infomation of merged_plan.dot

* refine color

* check in fixes

* check in script

* fix boxing bug when setting conf with sbp

* flag for iter

* fixbug of delete worker

* fix delete worker in script

* address review, add exclusive or check

* reuse plan to dot file

* refine plan dot

* fix and add flags

* fmt

* rm debug output

* more flags

* check Activation

* fix fc bug when num axes > 2

* reverse change

* reuse plan to dot file

* refine plan dot

* half impl of without scp bin

* feat: init_worker can without scp binary and no use uuid

* init multi-unit by send oneflow_worker binary and ConfigProto to worker machine

* refine var name

* refine code

* compile user/main job only on master

* bert multi machine test code

* fix bugs

* JobConfs

* fix bugs under WITH_RDMA

* fix multi-machine bugs

* delete useless code

* check in updated paths

* check in minimum setup tool

* put job_conf into plan

* using job_name judge isPullJob/isPushJob

* fix wrong job_id error

* model_init is a push job; model_save is a pull job