Article snapshot taken from Wikipedia with creative commons attribution-sharealike license.
Give it a read and then ask your questions in the chat.
We can research this topic together.
A query-level feature or QLF is a ranking feature utilized in a machine-learned ranking 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?
