THUSAM at NTCIR-11 IMine Task

This paper describes our approaches and results in NTCIR11 IMine task. In 2014, we participate in subtasks for Chinese/English Subtopic Mining and Chinese Document Ranking. In Subtopic Mining subtask, we mine subtopic candidates from various resources and construct the subtopic hierarchy with several dierent strategies. In Document Ranking subtask, we rerank the result lists with HITS algorithm and then adopt a pruning exhaustive search algorithm to generate diversied result lists.