... similarity to implement query ex-pansion, and use Rocchio formulation (J. J. Rocchio, 1971) to re-rank the search results. Thus, their query expansion and re-ranking are computed separately and ... Computational Linguistics An Iterative Implicit Feedback Approach to Personalized Search Yuanhua Lv 1, Le Sun 2, Junlin Zhang 2, Jian-Yun Nie 3, Wan Chen 4, and Wei Zhang 2 1, 2 Institute ... other systems which do result re-ranking and query expansion respectively in different ways, our system implements these two functions simultaneously and collaboratively — Query expansion...