Make dataset directory if it does not exist
Make dataset directory if it does not exist

keisuke-umezawa/chainer,cupy/cupy,kashif/chainer,wkentaro/chainer,niboshi/chainer,cupy/cupy,okuta/chainer,chainer/chainer,okuta/chainer,chainer/chainer,rezoo/chainer,wkentaro/chainer,hvy/chainer,keisuke-umezawa/chainer,keisuke-umezawa/chainer,niboshi/chainer,anaruse/chainer,niboshi/chainer,ysekky/chainer,aonotas/chainer,jnishi/chainer,chainer/chainer,ronekko/chainer,delta2323/chainer,niboshi/chainer,jnishi/chainer,cupy/cupy,hvy/chainer,kiyukuta/chainer,okuta/chainer,okuta/chainer,wkentaro/chainer,cupy/cupy,hvy/chainer,hvy/chainer,jnishi/chainer,pfnet/chainer,ktnyt/chainer,tkerola/chainer,chainer/chainer,ktnyt/chainer,keisuke-umezawa/chainer,jnishi/chainer,ktnyt/chainer,ktnyt/chainer,wkentaro/chainer