4.0.0 lenskit org.grouplens.lenskit 2.0.3.2 .. lenskit-data-structures LensKit Data Structures Common data structures used by the LensKit modules. it.unimi.dsi fastutil com.google.guava guava org.apache.commons commons-lang3 org.grouplens.lenskit lenskit-test ${project.version} test