add keepdims option to SigmoidCrossEntropy
add keepdims option to SigmoidCrossEntropy

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