作者机构:[1]Tsinghua National Laboratory for Information Science and Technology,Department of Computer Science and Technology, Tsinghua University, Beijing 100084, China, [2]Department of Computer Science, The University of Hong Kong, Pokfulam, Hong Kong, China
相关基金:Supported by the National Basic Research and Development (973) Program of China (No. 2011CB302206), the National Natural Sci- ence Foundation of China (Nos. 60833009 and 60933013), and the Research Grants Council of Hong Kong (RGC GRF Ref: HKU 718710E)