//Copyright (C) 2011 Zeno Gantner, Chris Newell
//
//This file is part of MyMediaLite.
//
//MyMediaLite is free software: you can redistribute it and/or modify
//it under the terms of the GNU General Public License as published by
//the Free Software Foundation, either version 3 of the License, or
//(at your option) any later version.
//
//MyMediaLite is distributed in the hope that it will be useful,
//but WITHOUT ANY WARRANTY; without even the implied warranty of
//MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
//GNU General Public License for more details.
//
//You should have received a copy of the GNU General Public License
//along with MyMediaLite. If not, see <http://www.gnu.org/licenses/>.
package org.mymedialite;
import java.util.List;
/**
* Interface for classes that provide item similarities.
* @version 2.03
*/
public interface IItemSimilarityProvider {
/**
* Get the similarity between two items.
* @return the item similarity; higher means more similar
* @param item_id1 the ID of the first item
* @param item_id2 the ID of the second item
*/
float getItemSimilarity(int item_id1, int item_id2);
/**
* Get the most similar items.
* @return the items most similar to a given item
* @param item_id the ID of the item
* @param n the number of similar items to return
*/
int[] getMostSimilarItems(int item_id, int n);
}