if axis == 0; directly copy D->D
if axis == 0; directly copy D->D

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