| /* |
| * 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.opennlp.utils.languagemodel; |
| |
| import java.util.Collections; |
| import org.apache.opennlp.utils.TestUtils; |
| import org.junit.Test; |
| |
| import static org.junit.Assert.assertEquals; |
| import static org.junit.Assert.assertTrue; |
| |
| /** |
| * Testcase for {@link org.apache.opennlp.utils.languagemodel.TrigramSentenceLanguageModel} |
| */ |
| public class TrigramSentenceLanguageModelTest { |
| |
| @Test |
| public void testEmptyVocabularyProbability() throws Exception { |
| TrigramSentenceLanguageModel<String> model = new TrigramSentenceLanguageModel<String>(); |
| assertEquals("probability with an empty vocabulary is always 0", 0d, model.calculateProbability(Collections.<String[]>emptySet(), |
| new String[0]), 0d); |
| assertEquals("probability with an empty vocabulary is always 0", 0d, model.calculateProbability(Collections.<String[]>emptySet(), |
| new String[]{"1", "2", "3"}), 0d); |
| } |
| |
| @Test |
| public void testRandomVocabularyAndSentence() throws Exception { |
| TrigramSentenceLanguageModel<String> model = new TrigramSentenceLanguageModel<String>(); |
| double probability = model.calculateProbability(TestUtils.generateRandomVocabulary(), TestUtils.generateRandomSentence()); |
| assertTrue("a probability measure should be between 0 and 1 [was " + probability + "]", probability >= 0 && probability <= 1); |
| } |
| |
| } |