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?
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Machine learning algorithms