Release notes for LensKit 2.0.3

The Git changelog and the list of closed tickets and pull requests provide more information on what has happened, including bugs that have been fixed.

This is the third bugfix release in the 2.0 series.

• Fix TopNItemRecommender bug when no scores are available (#issue(373)).

• Fix bug in retainAll for long sorted array sets (#issue(379)).

• Fix erroneous fix for scorer null pointer problems (#issue(363)).

• Add MeanCenteringVectorNormalizer for more efficient mean centering.

• Improve evaluator error reporting and logging output.

• Small performance improvements.

• Initial support for Top-N evaluation (grouplens/lenskit#388).

Credits

Thanks to @hmf and @ethanl for reporting bugs fixed in this release.