Change the declaration of EigenGemm from `class` to `struct`.
Change the declaration of EigenGemm from `class` to `struct`.

QiJune/Paddle,lcy-seso/Paddle,Canpio/Paddle,baidu/Paddle,luotao1/Paddle,putcn/Paddle,pkuyym/Paddle,jacquesqiao/Paddle,luotao1/Paddle,reyoung/Paddle,reyoung/Paddle,jacquesqiao/Paddle,QiJune/Paddle,hedaoyuan/Paddle,hedaoyuan/Paddle,pkuyym/Paddle,putcn/Paddle,tensor-tang/Paddle,baidu/Paddle,baidu/Paddle,pengli09/Paddle,baidu/Paddle,Canpio/Paddle,Canpio/Paddle,chengduoZH/Paddle,Canpio/Paddle,QiJune/Paddle,luotao1/Paddle,putcn/Paddle,jacquesqiao/Paddle,PaddlePaddle/Paddle,PaddlePaddle/Paddle,QiJune/Paddle,luotao1/Paddle,PaddlePaddle/Paddle,PaddlePaddle/Paddle,hedaoyuan/Paddle,Canpio/Paddle,pengli09/Paddle,reyoung/Paddle,jacquesqiao/Paddle,hedaoyuan/Paddle,reyoung/Paddle,chengduoZH/Paddle,chengduoZH/Paddle,pengli09/Paddle,luotao1/Paddle,pkuyym/Paddle,PaddlePaddle/Paddle,reyoung/Paddle,tensor-tang/Paddle,luotao1/Paddle,lcy-seso/Paddle,QiJune/Paddle,pengli09/Paddle,tensor-tang/Paddle,reyoung/Paddle,hedaoyuan/Paddle,baidu/Paddle,PaddlePaddle/Paddle,Canpio/Paddle,jacquesqiao/Paddle,tensor-tang/Paddle,pkuyym/Paddle,lcy-seso/Paddle,chengduoZH/Paddle,hedaoyuan/Paddle,pengli09/Paddle,hedaoyuan/Paddle,luotao1/Paddle,hedaoyuan/Paddle,putcn/Paddle,PaddlePaddle/Paddle,pkuyym/Paddle,QiJune/Paddle,Canpio/Paddle,pkuyym/Paddle,chengduoZH/Paddle,pengli09/Paddle,putcn/Paddle,lcy-seso/Paddle,pengli09/Paddle,Canpio/Paddle,lcy-seso/Paddle,pengli09/Paddle,lcy-seso/Paddle,putcn/Paddle,jacquesqiao/Paddle,tensor-tang/Paddle