add compare
add compare

ontologyzsy/galaxy,szxw/galaxy,May2016/galaxy,Kai-Zhang/galaxy,sdgdsffdsfff/galaxy,imotai/galaxy,May2016/galaxy,Kai-Zhang/galaxy,szxw/galaxy,szxw/galaxy,imotai/galaxy,sdgdsffdsfff/galaxy,baidu/galaxy,ontologyzsy/galaxy,imotai/galaxy,May2016/galaxy,taotaowill/galaxy,sdgdsffdsfff/galaxy,ontologyzsy/galaxy,bluebore/galaxy,bluebore/galaxy,taotaowill/galaxy,sdgdsffdsfff/galaxy,ontologyzsy/galaxy,imotai/galaxy,Kai-Zhang/galaxy,bluebore/galaxy,taotaowill/galaxy,baidu/galaxy,baidu/galaxy,sdgdsffdsfff/galaxy,szxw/galaxy,imotai/galaxy,ontologyzsy/galaxy,szxw/galaxy,bluebore/galaxy,bluebore/galaxy