* basic model update

* spell mistake

* fix bug

* remove a log line

* add model_update_kernel_test

* fix some problem in model_update

* function problem

* judge isfinite and change function

* fix batch problem

* remove model update test

* model_update_kernel_test

* change a name

* add two function in kernel_util

* add a function in kernel_util

* remove functions in kernel_util

* add op in conf

* conflict

* RMSProp model update kernel

* remove conflict

* fix comment error

* add const

* conflict

* conflict

* add operator

* fix some problem in rmsprop model update kernel

* format change

* momentum model update kernel test and fix a bug