| using Lucene.Net.Util; |
| using NUnit.Framework; |
| |
| namespace Lucene.Net.Search.Spell |
| { |
| /* |
| * 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. |
| */ |
| |
| public class TestNGramDistance : LuceneTestCase |
| { |
| [Test] |
| public void TestGetDistance1() |
| { |
| IStringDistance nsd = new NGramDistance(1); |
| float d = nsd.GetDistance("al", "al"); |
| assertEquals(d, 1.0f, 0.001); |
| d = nsd.GetDistance("a", "a"); |
| assertEquals(d, 1.0f, 0.001); |
| d = nsd.GetDistance("b", "a"); |
| assertEquals(d, 0.0f, 0.001); |
| d = nsd.GetDistance("martha", "marhta"); |
| assertEquals(d, 0.6666, 0.001); |
| d = nsd.GetDistance("jones", "johnson"); |
| assertEquals(d, 0.4285, 0.001); |
| d = nsd.GetDistance("natural", "contrary"); |
| assertEquals(d, 0.25, 0.001); |
| d = nsd.GetDistance("abcvwxyz", "cabvwxyz"); |
| assertEquals(d, 0.75, 0.001); |
| d = nsd.GetDistance("dwayne", "duane"); |
| assertEquals(d, 0.666, 0.001); |
| d = nsd.GetDistance("dixon", "dicksonx"); |
| assertEquals(d, 0.5, 0.001); |
| d = nsd.GetDistance("six", "ten"); |
| assertEquals(d, 0, 0.001); |
| float d1 = nsd.GetDistance("zac ephron", "zac efron"); |
| float d2 = nsd.GetDistance("zac ephron", "kai ephron"); |
| assertEquals(d1, d2, 0.001); |
| d1 = nsd.GetDistance("brittney spears", "britney spears"); |
| d2 = nsd.GetDistance("brittney spears", "brittney startzman"); |
| assertTrue(d1 > d2); |
| d1 = nsd.GetDistance("12345678", "12890678"); |
| d2 = nsd.GetDistance("12345678", "72385698"); |
| assertEquals(d1, d2, 001); |
| } |
| |
| [Test] |
| public void TestGetDistance2() |
| { |
| IStringDistance sd = new NGramDistance(2); |
| float d = sd.GetDistance("al", "al"); |
| assertEquals(d, 1.0f, 0.001); |
| d = sd.GetDistance("a", "a"); |
| assertEquals(d, 1.0f, 0.001); |
| d = sd.GetDistance("b", "a"); |
| assertEquals(d, 0.0f, 0.001); |
| d = sd.GetDistance("a", "aa"); |
| assertEquals(d, 0.5f, 0.001); |
| d = sd.GetDistance("martha", "marhta"); |
| assertEquals(d, 0.6666, 0.001); |
| d = sd.GetDistance("jones", "johnson"); |
| assertEquals(d, 0.4285, 0.001); |
| d = sd.GetDistance("natural", "contrary"); |
| assertEquals(d, 0.25, 0.001); |
| d = sd.GetDistance("abcvwxyz", "cabvwxyz"); |
| assertEquals(d, 0.625, 0.001); |
| d = sd.GetDistance("dwayne", "duane"); |
| assertEquals(d, 0.5833, 0.001); |
| d = sd.GetDistance("dixon", "dicksonx"); |
| assertEquals(d, 0.5, 0.001); |
| d = sd.GetDistance("six", "ten"); |
| assertEquals(d, 0, 0.001); |
| float d1 = sd.GetDistance("zac ephron", "zac efron"); |
| float d2 = sd.GetDistance("zac ephron", "kai ephron"); |
| assertTrue(d1 > d2); |
| d1 = sd.GetDistance("brittney spears", "britney spears"); |
| d2 = sd.GetDistance("brittney spears", "brittney startzman"); |
| assertTrue(d1 > d2); |
| d1 = sd.GetDistance("0012345678", "0012890678"); |
| d2 = sd.GetDistance("0012345678", "0072385698"); |
| assertEquals(d1, d2, 0.001); |
| } |
| |
| [Test] |
| public void TestGetDistance3() |
| { |
| IStringDistance sd = new NGramDistance(3); |
| float d = sd.GetDistance("al", "al"); |
| assertEquals(d, 1.0f, 0.001); |
| d = sd.GetDistance("a", "a"); |
| assertEquals(d, 1.0f, 0.001); |
| d = sd.GetDistance("b", "a"); |
| assertEquals(d, 0.0f, 0.001); |
| d = sd.GetDistance("martha", "marhta"); |
| assertEquals(d, 0.7222, 0.001); |
| d = sd.GetDistance("jones", "johnson"); |
| assertEquals(d, 0.4762, 0.001); |
| d = sd.GetDistance("natural", "contrary"); |
| assertEquals(d, 0.2083, 0.001); |
| d = sd.GetDistance("abcvwxyz", "cabvwxyz"); |
| assertEquals(d, 0.5625, 0.001); |
| d = sd.GetDistance("dwayne", "duane"); |
| assertEquals(d, 0.5277, 0.001); |
| d = sd.GetDistance("dixon", "dicksonx"); |
| assertEquals(d, 0.4583, 0.001); |
| d = sd.GetDistance("six", "ten"); |
| assertEquals(d, 0, 0.001); |
| float d1 = sd.GetDistance("zac ephron", "zac efron"); |
| float d2 = sd.GetDistance("zac ephron", "kai ephron"); |
| assertTrue(d1 > d2); |
| d1 = sd.GetDistance("brittney spears", "britney spears"); |
| d2 = sd.GetDistance("brittney spears", "brittney startzman"); |
| assertTrue(d1 > d2); |
| d1 = sd.GetDistance("0012345678", "0012890678"); |
| d2 = sd.GetDistance("0012345678", "0072385698"); |
| assertTrue(d1 < d2); |
| } |
| |
| [Test] |
| public void TestEmpty() |
| { |
| IStringDistance nsd = new NGramDistance(1); |
| float d = nsd.GetDistance("", "al"); |
| assertEquals(d, 0.0f, 0.001); |
| } |
| } |
| } |