Recommender interfaces defined by LensKit.
'org.grouplens.lenskit:lenskit-api:2.0.2'
<dependency>
<groupId>org.grouplens.lenskit</groupId>
<artifactId>lenskit-api</artifactId>
<version>2.0.2</version>
</dependency>
<dependency org="org.grouplens.lenskit" name="lenskit-api" rev="2.0.2"/>
"org.grouplens.lenskit", "lenskit-api", "2.0.2"