Change the default return value of version from 0 to UNKNOWN
Change the default return value of version from 0 to UNKNOWN

chengduoZH/Paddle,chengduoZH/Paddle,reyoung/Paddle,chengduoZH/Paddle,QiJune/Paddle,baidu/Paddle,QiJune/Paddle,luotao1/Paddle,reyoung/Paddle,luotao1/Paddle,tensor-tang/Paddle,reyoung/Paddle,luotao1/Paddle,jacquesqiao/Paddle,baidu/Paddle,QiJune/Paddle,PaddlePaddle/Paddle,jacquesqiao/Paddle,tensor-tang/Paddle,PaddlePaddle/Paddle,luotao1/Paddle,jacquesqiao/Paddle,tensor-tang/Paddle,jacquesqiao/Paddle,PaddlePaddle/Paddle,PaddlePaddle/Paddle,luotao1/Paddle,chengduoZH/Paddle,QiJune/Paddle,reyoung/Paddle,PaddlePaddle/Paddle,tensor-tang/Paddle,baidu/Paddle,jacquesqiao/Paddle,reyoung/Paddle,tensor-tang/Paddle,luotao1/Paddle,baidu/Paddle,QiJune/Paddle,baidu/Paddle,reyoung/Paddle,PaddlePaddle/Paddle,luotao1/Paddle,jacquesqiao/Paddle,PaddlePaddle/Paddle,QiJune/Paddle,chengduoZH/Paddle