Dev model init op (#2117)

* assign op


AddGlobalStepOpConf


fix


ARITHMETIC_DATA_TYPE_SEQ


identity_op_conf


add ops


GenNewSnapshotName


SnapshotOp


cleanup


blob name


LearningRateScheduleOp


LearningRateScheduleKernel


LearningRateScheduleKernel


AddLearningRateScheduleOpConf


learning rate


cleanup


fix


fix

* remove total_mbn_num

* date time format

* save

* refine

* refine

* revert

* refine snapshot

* fix

* refine

* AutoGlobalStep

* refine

* GenLogicalBlobName

* AutoLearningRate

* remove JobDesc lr

* fix snapshot path

* Maybe<void>

* learning_rate blob

* remove next_model_vid


fix


fix 


fix


learning_rate

* train_conf

* fix for global step on multi nodes

* SnapshotReader


snapshot writer


model init op


fix


refine


init


InitializeFromSnapshotConf


model io job


ModelLoadOp


ModelLoadKernel


MakeModelLoadJob


ModelSaveOp


fix


InterUserJobInfo


_MakeModelLoadJobFunc


MutModelLoadOpConTickInputHelper


fix


refine


init/load/save


set_default_variable

* remove SnapshotMgr

* snapshot.h

* delete model_init_job.cpp


foreign_input_op_conf


fix


snapshot path


set path


op_conf


fix


fix CopyFromNdarray


to bytes c


use uint8


char2uint8

* model init

* model io

* fix

* ModelSaveKernel

* mutable_batch_axis()->Clear()

* InferBatchAxis

* fix

* refine

* job set

* MakeModelIoJobs

* fix

* jobs

* fix

* model io job

* GenOutputOpConf

* refine snapshot

* refine

* fix

* refine CheckPoint

* remove session

* refine

* refine

* refine

* remove keyword.h/cpp

* refine

* global_step=>train_step

* GetSbpSignatures

* ModelInitOp