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Apache Solr Learning to Rank Package

There is a newer version: 9.7.0

/*
 * 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.apache.solr.ltr.interleaving;

import org.apache.lucene.search.ScoreDoc;
import org.apache.solr.common.SolrException;
import org.apache.solr.ltr.interleaving.algorithms.TeamDraftInterleaving;

/**
 * Interleaving considers two ranking models: modelA and modelB.

 * For a given query, each model returns its ranked list of documents La = (a1,a2,...) and Lb = (b1,
 * b2, ...).

 * An Interleaving algorithm creates a unique ranked list I = (i1, i2, ...).

 * This list is created by interleaving elements from the two lists la and lb as described by the
 * implementation algorithm.

 * Each element Ij is labelled TeamA if it is selected from La and TeamB if it is selected from Lb.
 */
public interface Interleaving {

  String TEAM_DRAFT = "TeamDraft";

  InterleavingResult interleave(ScoreDoc[] rerankedA, ScoreDoc[] rerankedB);

  static Interleaving getImplementation(String algorithm) {
    switch (algorithm) {
      case TEAM_DRAFT:
        return new TeamDraftInterleaving();
      default:
        throw new SolrException(
            SolrException.ErrorCode.BAD_REQUEST, "Unknown Interleaving algorithm: " + algorithm);
    }
  }
}