Add unitest for factorization machine layer with sparse input
Add unitest for factorization machine layer with sparse input

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