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A query-level feature or QLF is a ranking feature utilized in a
machine-learned ranking Learning to rank. Slides from Tie-Yan Liu's talk at WWW 2009 conference aravailable online or machine-learned ranking (MLR) is the application of machine learning, typically supervised, semi-supervised or reinforcement learning, in the construc ...
algorithm. Example QLFs: * How many times has this query been run in the last month? * How many words are in the query? * What is the sum/average/min/max/median of the BM25F values for the query? {{compu-ai-stub Machine learning algorithms