This author has not been identified. Look up 'Luoqi Liu' in GoogleThis author has not been identified. Look up 'Chao Xiong' in GoogleThis author has not been identified. Look up 'Hanwang Zhang' in GoogleThis author has not been identified. Look up 'Zhiheng Niu' in GoogleThis author has not been identified. It may be one of the following persons: Look up 'Meng Wang' in GoogleThis author has not been identified. Look up 'Shuicheng Yan' in Google