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A Java's Collaborative Filtering library to carry out experiments in research of Collaborative Filtering based Recommender Systems. The library has been designed from researchers to researchers.

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package cf4j.model.matrixFactorization;

/**
 * Interface for matrix factorization model based collaborative filtering. It has two
 * methods: 
 * 
 * 		train: computes factorization process.
 * 		getPrediction: get rating prediction of an user to an item.
 * 
 * 
 * @author Fernando Ortega
 *
 */
public interface FactorizationModel {
	
	/**
	 * Runs matrix factorization process. Parallelization must be implemented
	 * inside this method.
	 */
	public void train ();
	
	/**
	 * Get rating prediction of an user to an item
	 * @param userIndex User index
	 * @param itemIndex Item index
	 * @return Rating prediction
	 */
	public double getPrediction (int userIndex, int itemIndex);
}