Use NPZ in the tutorial by default
Use NPZ in the tutorial by default

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