Validation size set by fraction and remove unnecessary class
Validation size set by fraction and remove unnecessary class

niboshi/chainer,jnishi/chainer,wkentaro/chainer,wkentaro/chainer,rezoo/chainer,okuta/chainer,aonotas/chainer,ronekko/chainer,okuta/chainer,niboshi/chainer,ktnyt/chainer,jnishi/chainer,chainer/chainer,wkentaro/chainer,okuta/chainer,wkentaro/chainer,keisuke-umezawa/chainer,pfnet/chainer,keisuke-umezawa/chainer,hvy/chainer,chainer/chainer,hvy/chainer,jnishi/chainer,niboshi/chainer,hvy/chainer,ktnyt/chainer,anaruse/chainer,chainer/chainer,chainer/chainer,ktnyt/chainer,tkerola/chainer,hvy/chainer,okuta/chainer,ktnyt/chainer,keisuke-umezawa/chainer,keisuke-umezawa/chainer,niboshi/chainer,jnishi/chainer