Release notes for LensKit 1.0

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 release includes many documentation improvements and general cleanups from LensKit 0.11.

Core

• Added set method for setting parameters.

• Recommender engine factories now throw a checked RecommenderBuildException.

Algorithms

• Factored out FunkSVD stopping conditions, made default now 100 iterations. If you want a delta RMSE threshold, use ThresholdStoppingCondition and set the ThresholdValue parameter.

• Moved FunkSVD to the o.g.l.mf.funksvd package.

• Made Slope-One use k-NN, specifically item-item, as the base framework rather than being standalone. Future tasks will further harness and develop this merger.

• Support item vector normalizers for the item-item similarity matrix (see NormalizingSimilarityMatrixAccumulatorFactory.

• Move vector similarity code into o.g.l.vectors.similarity.

• Made item-item clamp predictions to the preference domain, if it is available.

Evaluator

• Evaluation scripts now have access to command line arguments (#issue(138)).

• Added support for a block form of the within directive.

• Added the dumpGraph command to dump recommender configurations to GraphViz.

• Added new archetype to aid in creating evaluation projects.

Cleanup

• Removed all deprecated methods.