Procedures for learning and ranking items in a listwise manner are
discussed. A listwise methodology may consider a ranked list, of
individual items, as a specific permutation of the items being ranked. In
implementations, a listwise loss function may be used in ranking items. A
listwise loss function may be a metric which reflects the departure or
disorder from an exemplary ranking for one or more sample listwise
rankings used in learning. In this manner, the loss function may
approximate the exemplary ranking for the plurality of items being
ranked.