Avoid conversion from std::make_unique to std::shared_ptr
Avoid conversion from std::make_unique to std::shared_ptr

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