use Lenskit to predicate the book rating
java,plugins,prediction,collaborative-filtering,lenskit
First, the traditional way to do this is via cross-validation, where you do a robust randomized splitting of the data into training data and test data. The LensKit Evaluator supports doing this. The Quick Start descries how to get started; also there is a quick start that includes current best...
Lenskit: what is channel, side channel, typed side channel
LensKit lead developer here. Sparse vectors and scored IDs are used to associate values with IDs (usually users or items). Side channels are a mechanism to associate additional values with each ID. They are extra data (an additional 'channel' of data) that goes with the 'primary' data. 'Typed' side channels...