Fix numpy.float32 to chainerx.float32
Fix numpy.float32 to chainerx.float32

niboshi/chainer,hvy/chainer,ktnyt/chainer,ktnyt/chainer,jnishi/chainer,pfnet/chainer,keisuke-umezawa/chainer,ktnyt/chainer,tkerola/chainer,wkentaro/chainer,wkentaro/chainer,hvy/chainer,hvy/chainer,wkentaro/chainer,hvy/chainer,niboshi/chainer,chainer/chainer,keisuke-umezawa/chainer,okuta/chainer,jnishi/chainer,niboshi/chainer,wkentaro/chainer,keisuke-umezawa/chainer,jnishi/chainer,okuta/chainer,niboshi/chainer,chainer/chainer,chainer/chainer,okuta/chainer,ktnyt/chainer,okuta/chainer,chainer/chainer,jnishi/chainer,keisuke-umezawa/chainer