add type conversion for batch_size
add type conversion for batch_size

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