Fix wrong index in dataset downloading exception
Fix wrong index in dataset downloading exception

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