change type check to only accept float32
change type check to only accept float32

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