Attempt on a Kaggle competition, Personalized Web Search Challenge, hosted by Yandex (http://www.kaggle.com/c/yandex-personalized-web-search-challenge)
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S1 Task A1: Find the relevance mean for documents in each rank position, in the case the user has liked the same query-document pair in previous sessions. #28
This is for Strategy 1. Assumption is that users tend to look for the same documents over time.