Whether the OperatorBase needs an initial interface?

[qingqing01]

Now the OperatorBase has one default empty constructor. And each operator will be created by calling this empty constructor in OpRegistry:: CreateOp(). Where to do the operations which only need to be done once in the operator? For example, we create an auxiliary object in the RNN operator. so, whether the OperatorBase needs an initial interface?

[JiayiFeng]

I think we can add a virtual Init function which does nothing in OperatorBase:

virtual void Init() {}

and overwrite it in any Op that really need some initialization.

Op->Init() could be called in OpRegistry::CreateOp() after attribute check.