lucene/classification/src/test/org/apache/lucene/classification/document/TestSimpleNaiveBayesDocumentClassifier.java

/*
 * 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.lucene.classification.document;

import org.apache.lucene.util.BytesRef;
import org.junit.Test;

/** Tests for {@link org.apache.lucene.classification.SimpleNaiveBayesClassifier} */
public class TestSimpleNaiveBayesDocumentClassifier
    extends DocumentClassificationTestBase<BytesRef> {

  @Test
  public void testBasicDocumentClassification() throws Exception {
    try {
      checkCorrectDocumentClassification(
          new SimpleNaiveBayesDocumentClassifier(
              indexReader,
              null,
              categoryFieldName,
              field2analyzer,
              new String[] {textFieldName, titleFieldName, authorFieldName}),
          getVideoGameDocument(),
          VIDEOGAME_ANALYZED_RESULT);
      checkCorrectDocumentClassification(
          new SimpleNaiveBayesDocumentClassifier(
              indexReader,
              null,
              categoryFieldName,
              field2analyzer,
              new String[] {textFieldName, titleFieldName, authorFieldName}),
          getBatmanDocument(),
          BATMAN_RESULT);

      checkCorrectDocumentClassification(
          new SimpleNaiveBayesDocumentClassifier(
              indexReader, null, categoryFieldName, field2analyzer, new String[] {textFieldName}),
          getVideoGameDocument(),
          BATMAN_RESULT);
      checkCorrectDocumentClassification(
          new SimpleNaiveBayesDocumentClassifier(
              indexReader, null, categoryFieldName, field2analyzer, new String[] {textFieldName}),
          getBatmanDocument(),
          VIDEOGAME_ANALYZED_RESULT);
    } finally {
      if (indexReader != null) {
        indexReader.close();
      }
    }
  }

  @Test
  public void testBasicDocumentClassificationScore() throws Exception {
    try {
      double score1 =
          checkCorrectDocumentClassification(
              new SimpleNaiveBayesDocumentClassifier(
                  indexReader,
                  null,
                  categoryFieldName,
                  field2analyzer,
                  new String[] {textFieldName, titleFieldName, authorFieldName}),
              getVideoGameDocument(),
              VIDEOGAME_ANALYZED_RESULT);
      assertEquals(0.88, score1, 0.01);
      double score2 =
          checkCorrectDocumentClassification(
              new SimpleNaiveBayesDocumentClassifier(
                  indexReader,
                  null,
                  categoryFieldName,
                  field2analyzer,
                  new String[] {textFieldName, titleFieldName, authorFieldName}),
              getBatmanDocument(),
              BATMAN_RESULT);
      assertEquals(0.89, score2, 0.01);
      // taking in consideration only the text
      double score3 =
          checkCorrectDocumentClassification(
              new SimpleNaiveBayesDocumentClassifier(
                  indexReader,
                  null,
                  categoryFieldName,
                  field2analyzer,
                  new String[] {textFieldName}),
              getVideoGameDocument(),
              BATMAN_RESULT);
      assertEquals(0.55, score3, 0.01);
      double score4 =
          checkCorrectDocumentClassification(
              new SimpleNaiveBayesDocumentClassifier(
                  indexReader,
                  null,
                  categoryFieldName,
                  field2analyzer,
                  new String[] {textFieldName}),
              getBatmanDocument(),
              VIDEOGAME_ANALYZED_RESULT);
      assertEquals(0.52, score4, 0.01);
    } finally {
      if (indexReader != null) {
        indexReader.close();
      }
    }
  }

  @Test
  public void testBoostedDocumentClassification() throws Exception {
    try {
      checkCorrectDocumentClassification(
          new SimpleNaiveBayesDocumentClassifier(
              indexReader,
              null,
              categoryFieldName,
              field2analyzer,
              new String[] {textFieldName, titleFieldName + "^100", authorFieldName}),
          getBatmanAmbiguosDocument(),
          BATMAN_RESULT);
      // considering without boost wrong classification will appear
      checkCorrectDocumentClassification(
          new SimpleNaiveBayesDocumentClassifier(
              indexReader,
              null,
              categoryFieldName,
              field2analyzer,
              new String[] {textFieldName, titleFieldName, authorFieldName}),
          getBatmanAmbiguosDocument(),
          VIDEOGAME_ANALYZED_RESULT);
    } finally {
      if (indexReader != null) {
        indexReader.close();
      }
    }
  }
}