/*
* 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 opennlp.tools.ngram;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import org.junit.Assert;
import org.junit.Test;
import opennlp.tools.dictionary.Dictionary;
import opennlp.tools.util.InvalidFormatException;
import opennlp.tools.util.StringList;
/**
* Tests for {@link opennlp.tools.ngram.NGramModel}
*/
public class NGramModelTest {
@Test
public void testZeroGetCount() throws Exception {
NGramModel ngramModel = new NGramModel();
int count = ngramModel.getCount(new StringList(""));
Assert.assertEquals(0, count);
Assert.assertEquals(0, ngramModel.size());
}
@Test
public void testZeroGetCount2() throws Exception {
NGramModel ngramModel = new NGramModel();
ngramModel.add(new StringList("the", "bro", "wn"));
int count = ngramModel.getCount(new StringList("fox"));
Assert.assertEquals(0, count);
Assert.assertEquals(1, ngramModel.size());
}
@Test
public void testAdd() throws Exception {
NGramModel ngramModel = new NGramModel();
ngramModel.add(new StringList("the", "bro", "wn"));
int count = ngramModel.getCount(new StringList("the"));
Assert.assertEquals(0, count);
Assert.assertEquals(1, ngramModel.size());
}
@Test
public void testAdd1() throws Exception {
NGramModel ngramModel = new NGramModel();
ngramModel.add(new StringList("the", "bro", "wn"));
int count = ngramModel.getCount(new StringList("the", "bro", "wn"));
Assert.assertEquals(1, count);
Assert.assertEquals(1, ngramModel.size());
}
@Test
public void testAdd2() throws Exception {
NGramModel ngramModel = new NGramModel();
ngramModel.add(new StringList("the", "bro", "wn"), 2, 3);
int count = ngramModel.getCount(new StringList("the", "bro", "wn"));
Assert.assertEquals(1, count);
Assert.assertEquals(3, ngramModel.size());
}
@Test
public void testAdd3() throws Exception {
NGramModel ngramModel = new NGramModel();
ngramModel.add(new StringList("the", "brown", "fox"), 2, 3);
int count = ngramModel.getCount(new StringList("the", "brown", "fox"));
Assert.assertEquals(1, count);
count = ngramModel.getCount(new StringList("the", "brown"));
Assert.assertEquals(1, count);
count = ngramModel.getCount(new StringList("brown", "fox"));
Assert.assertEquals(1, count);
Assert.assertEquals(3, ngramModel.size());
}
@Test
public void testRemove() throws Exception {
NGramModel ngramModel = new NGramModel();
StringList tokens = new StringList("the", "bro", "wn");
ngramModel.add(tokens);
ngramModel.remove(tokens);
Assert.assertEquals(0, ngramModel.size());
}
@Test
public void testContains() throws Exception {
NGramModel ngramModel = new NGramModel();
StringList tokens = new StringList("the", "bro", "wn");
ngramModel.add(tokens);
Assert.assertFalse(ngramModel.contains(new StringList("the")));
}
@Test
public void testContains2() throws Exception {
NGramModel ngramModel = new NGramModel();
StringList tokens = new StringList("the", "bro", "wn");
ngramModel.add(tokens, 1, 3);
Assert.assertTrue(ngramModel.contains(new StringList("the")));
}
@Test
public void testNumberOfGrams() throws Exception {
NGramModel ngramModel = new NGramModel();
StringList tokens = new StringList("the", "bro", "wn");
ngramModel.add(tokens, 1, 3);
Assert.assertEquals(6, ngramModel.numberOfGrams());
}
@Test
public void testCutoff1() throws Exception {
NGramModel ngramModel = new NGramModel();
StringList tokens = new StringList("the", "brown", "fox", "jumped");
ngramModel.add(tokens, 1, 3);
ngramModel.cutoff(2, 4);
Assert.assertEquals(0, ngramModel.size());
}
@Test
public void testCutoff2() throws Exception {
NGramModel ngramModel = new NGramModel();
StringList tokens = new StringList("the", "brown", "fox", "jumped");
ngramModel.add(tokens, 1, 3);
ngramModel.cutoff(1, 3);
Assert.assertEquals(9, ngramModel.size());
}
@Test
public void testToDictionary() throws Exception {
NGramModel ngramModel = new NGramModel();
StringList tokens = new StringList("the", "brown", "fox", "jumped");
ngramModel.add(tokens, 1, 3);
tokens = new StringList("the", "brown", "Fox", "jumped");
ngramModel.add(tokens, 1, 3);
Dictionary dictionary = ngramModel.toDictionary();
Assert.assertNotNull(dictionary);
Assert.assertEquals(9, dictionary.size());
Assert.assertEquals(1, dictionary.getMinTokenCount());
Assert.assertEquals(3, dictionary.getMaxTokenCount());
}
@Test
public void testToDictionary1() throws Exception {
NGramModel ngramModel = new NGramModel();
StringList tokens = new StringList("the", "brown", "fox", "jumped");
ngramModel.add(tokens, 1, 3);
tokens = new StringList("the", "brown", "Fox", "jumped");
ngramModel.add(tokens, 1, 3);
Dictionary dictionary = ngramModel.toDictionary(true);
Assert.assertNotNull(dictionary);
Assert.assertEquals(14, dictionary.size());
Assert.assertEquals(1, dictionary.getMinTokenCount());
Assert.assertEquals(3, dictionary.getMaxTokenCount());
}
@Test(expected = InvalidFormatException.class)
public void testInvalidFormat() throws Exception {
InputStream stream = new ByteArrayInputStream("inputstring".getBytes(StandardCharsets.UTF_8));
NGramModel ngramModel = new NGramModel(stream);
stream.close();
ngramModel.toDictionary(true);
}
@Test
public void testFromFile() throws Exception {
InputStream stream = getClass().getResourceAsStream("/opennlp/tools/ngram/ngram-model.xml");
NGramModel ngramModel = new NGramModel(stream);
stream.close();
Dictionary dictionary = ngramModel.toDictionary(true);
Assert.assertNotNull(dictionary);
Assert.assertEquals(14, dictionary.size());
Assert.assertEquals(3, dictionary.getMaxTokenCount());
Assert.assertEquals(1, dictionary.getMinTokenCount());
}
@Test
public void testSerialize() throws Exception {
InputStream stream = getClass().getResourceAsStream("/opennlp/tools/ngram/ngram-model.xml");
NGramModel ngramModel1 = new NGramModel(stream);
stream.close();
Dictionary dictionary = ngramModel1.toDictionary(true);
Assert.assertNotNull(dictionary);
Assert.assertEquals(14, dictionary.size());
Assert.assertEquals(3, dictionary.getMaxTokenCount());
Assert.assertEquals(1, dictionary.getMinTokenCount());
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ngramModel1.serialize(baos);
final String serialized = new String(baos.toByteArray(), Charset.defaultCharset());
InputStream inputStream = new ByteArrayInputStream(serialized.getBytes(StandardCharsets.UTF_8));
NGramModel ngramModel2 = new NGramModel(inputStream);
stream.close();
Assert.assertEquals(ngramModel2.numberOfGrams(), ngramModel2.numberOfGrams());
Assert.assertEquals(ngramModel2.size(), ngramModel2.size());
dictionary = ngramModel2.toDictionary(true);
Assert.assertNotNull(dictionary);
Assert.assertEquals(14, dictionary.size());
Assert.assertEquals(3, dictionary.getMaxTokenCount());
Assert.assertEquals(1, dictionary.getMinTokenCount());
}
@Test(expected = InvalidFormatException.class)
public void testFromInvalidFileMissingCount() throws Exception {
InputStream stream = getClass().getResourceAsStream("/opennlp/tools/ngram/ngram-model-no-count.xml");
NGramModel ngramModel = new NGramModel(stream);
stream.close();
ngramModel.toDictionary(true);
}
@Test(expected = InvalidFormatException.class)
public void testFromInvalidFileNotANumber() throws Exception {
InputStream stream = getClass().getResourceAsStream("/opennlp/tools/ngram/ngram-model-not-a-number.xml");
NGramModel ngramModel = new NGramModel(stream);
stream.close();
ngramModel.toDictionary(true);
}
}