fix the build of the doc.
fix the build of the doc.

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