Created by: wangkuiyi

At https://github.com/PaddlePaddle/Paddle/blob/e31a469ee09e8ab5f6048eb69f71ca89e9dbbf97/paddle/framework/operator.h#L237, class InferShapeContext is derived from OperatorContext but adds nothing. Do we really need InferShapeContext, or should we use OperatorContext with OperatorBase::InferShape?