org.codelibs.elasticsearch.taste.similarity.PreferenceInferrer Maven / Gradle / Ivy
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.codelibs.elasticsearch.taste.similarity;
import org.codelibs.elasticsearch.taste.common.Refreshable;
/**
*
* Implementations of this interface compute an inferred preference for a user and an item that the user has
* not expressed any preference for. This might be an average of other preferences scores from that user, for
* example. This technique is sometimes called "default voting".
*
*/
public interface PreferenceInferrer extends Refreshable {
/**
*
* Infers the given user's preference value for an item.
*
*
* @param userID
* ID of user to infer preference for
* @param itemID
* item ID to infer preference for
* @return inferred preference
*/
float inferPreference(long userID, long itemID);
}