refine the defination of class GradientClipByGlobalNorm
refine the defination of class GradientClipByGlobalNorm

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