refine device_context_test
refine device_context_test

yu239/Paddle,Canpio/Paddle,Canpio/Paddle,luotao1/Paddle,pengli09/Paddle,putcn/Paddle,lcy-seso/Paddle,putcn/Paddle,pengli09/Paddle,PaddlePaddle/Paddle,putcn/Paddle,PaddlePaddle/Paddle,yu239/Paddle,hedaoyuan/Paddle,PaddlePaddle/Paddle,lcy-seso/Paddle,hedaoyuan/Paddle,baidu/Paddle,tensor-tang/Paddle,baidu/Paddle,yu239/Paddle,luotao1/Paddle,PaddlePaddle/Paddle,tensor-tang/Paddle,pkuyym/Paddle,tensor-tang/Paddle,pengli09/Paddle,lispc/Paddle,baidu/Paddle,yu239/Paddle,QiJune/Paddle,luotao1/Paddle,hedaoyuan/Paddle,putcn/Paddle,reyoung/Paddle,Canpio/Paddle,reyoung/Paddle,yu239/Paddle,PaddlePaddle/Paddle,luotao1/Paddle,baidu/Paddle,luotao1/Paddle,lispc/Paddle,lcy-seso/Paddle,tensor-tang/Paddle,jacquesqiao/Paddle,hedaoyuan/Paddle,pkuyym/Paddle,lispc/Paddle,chengduoZH/Paddle,QiJune/Paddle,QiJune/Paddle,baidu/Paddle,reyoung/Paddle,yu239/Paddle,jacquesqiao/Paddle,luotao1/Paddle,hedaoyuan/Paddle,hedaoyuan/Paddle,chengduoZH/Paddle,putcn/Paddle,jacquesqiao/Paddle,pengli09/Paddle,lispc/Paddle,Canpio/Paddle,yu239/Paddle,reyoung/Paddle,Canpio/Paddle,lcy-seso/Paddle,lispc/Paddle,pkuyym/Paddle,hedaoyuan/Paddle,tensor-tang/Paddle,pengli09/Paddle,QiJune/Paddle,reyoung/Paddle,lcy-seso/Paddle,jacquesqiao/Paddle,lispc/Paddle,pkuyym/Paddle,pkuyym/Paddle,chengduoZH/Paddle,jacquesqiao/Paddle,PaddlePaddle/Paddle,pengli09/Paddle,putcn/Paddle,jacquesqiao/Paddle,QiJune/Paddle,PaddlePaddle/Paddle,pkuyym/Paddle,Canpio/Paddle,reyoung/Paddle,pengli09/Paddle,lispc/Paddle,lcy-seso/Paddle,hedaoyuan/Paddle,QiJune/Paddle,pengli09/Paddle,yu239/Paddle,chengduoZH/Paddle,luotao1/Paddle,chengduoZH/Paddle,Canpio/Paddle,lispc/Paddle,Canpio/Paddle