Refine doc and fix dtype.
Refine doc and fix dtype.

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