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source: branches/2886_SymRegGrammarEnumeration/Test/TreeHashingTest.cs @ 15936

Last change on this file since 15936 was 15849, checked in by lkammere, 7 years ago

#2886: Add constants to grammar.
File size: 7.2 KB
Line 
1using System.Linq;
2using HeuristicLab.Algorithms.DataAnalysis.SymRegGrammarEnumeration;
3using HeuristicLab.Algorithms.DataAnalysis.SymRegGrammarEnumeration.GrammarEnumeration;
4using Microsoft.VisualStudio.TestTools.UnitTesting;
5
6namespace Test {
7  [TestClass]
8  public class TreeHashingTest {
9
10    private Grammar grammar;
11    private TerminalSymbol varA;
12    private TerminalSymbol varB;
13    private TerminalSymbol varC;
14    private TerminalSymbol c;
15
16    [TestInitialize]
17    public void InitTest() {
18      grammar = new Grammar(new[] { "a", "b", "c" });
19
20      varA = grammar.VarTerminals.First(s => s.StringRepresentation == "a");
21      varB = grammar.VarTerminals.First(s => s.StringRepresentation == "b");
22      varC = grammar.VarTerminals.First(s => s.StringRepresentation == "c");
23      c = grammar.Const;
24    }
25
26    [TestMethod]
27    [TestCategory("TreeHashing")]
28    public void SimpleEqualityAddition() {
29      SymbolString s1 = new SymbolString(new[] { varA, varB, grammar.Addition, varC, grammar.Addition });
30      SymbolString s2 = new SymbolString(new[] { varA, varB, grammar.Addition, varC, grammar.Addition });
31
32      int hash1 = grammar.Hasher.CalcHashCode(s1);
33      int hash2 = grammar.Hasher.CalcHashCode(s2);
34
35      Assert.AreEqual(hash1, hash2);
36    }
37
38    [TestMethod]
39    [TestCategory("TreeHashing")]
40    public void SimpleInequalityAddition() {
41      SymbolString s1 = new SymbolString(new[] { varA, varB, grammar.Addition, varC, grammar.Addition });
42      SymbolString s2 = new SymbolString(new[] { varB, varB, grammar.Addition, varB, grammar.Addition });
43
44      int hash1 = grammar.Hasher.CalcHashCode(s1);
45      int hash2 = grammar.Hasher.CalcHashCode(s2);
46
47      Assert.AreNotEqual(hash1, hash2);
48    }
49
50    [TestMethod]
51    [TestCategory("TreeHashing")]
52    public void CommutativityAddition() {
53      SymbolString s1 = new SymbolString(new[] { varA, varB, grammar.Addition });
54      SymbolString s2 = new SymbolString(new[] { varB, varA, grammar.Addition });
55
56      int hash1 = grammar.Hasher.CalcHashCode(s1);
57      int hash2 = grammar.Hasher.CalcHashCode(s2);
58
59      Assert.AreEqual(hash1, hash2);
60    }
61
62    [TestMethod]
63    [TestCategory("TreeHashing")]
64    public void AssociativityAddition() {
65      SymbolString s1 = new SymbolString(new[] { varA, varB, grammar.Addition, varA, grammar.Addition });
66      SymbolString s2 = new SymbolString(new[] { varA, varB, varA, grammar.Addition, grammar.Addition });
67
68      int hash1 = grammar.Hasher.CalcHashCode(s1);
69      int hash2 = grammar.Hasher.CalcHashCode(s2);
70
71      Assert.AreEqual(hash1, hash2);
72    }
73
74    [TestMethod]
75    [TestCategory("TreeHashing")]
76    public void RepeatedAddition() {
77      SymbolString s1 = new SymbolString(new[] { varA, varA, grammar.Addition, varA, grammar.Addition });
78      SymbolString s2 = new SymbolString(new[] { varA });
79
80      int hash1 = grammar.Hasher.CalcHashCode(s1);
81      int hash2 = grammar.Hasher.CalcHashCode(s2);
82
83      Assert.AreEqual(hash1, hash2);
84    }
85
86    [TestMethod]
87    [TestCategory("TreeHashing")]
88    public void ComplexInequality() {
89      SymbolString s1 = new SymbolString(new[] { varA, varA, varA, grammar.Multiplication, grammar.Multiplication });
90      SymbolString s2 = new SymbolString(new[] { varA, varA, varA, grammar.Multiplication, grammar.Addition });
91
92      int hash1 = grammar.Hasher.CalcHashCode(s1);
93      int hash2 = grammar.Hasher.CalcHashCode(s2);
94
95      Assert.AreNotEqual(hash1, hash2);
96    }
97
98    [TestMethod]
99    [TestCategory("TreeHashing")]
100    public void NonterminalHashing() {
101      SymbolString s1 = new SymbolString(new Symbol[] { varA, varA, grammar.Expr, grammar.Addition, grammar.Addition });
102      SymbolString s2 = new SymbolString(new Symbol[] { varA, grammar.Expr, grammar.Addition });
103
104      int hash1 = grammar.Hasher.CalcHashCode(s1);
105      int hash2 = grammar.Hasher.CalcHashCode(s2);
106
107      Assert.AreEqual(hash1, hash2);
108    }
109
110    [TestMethod]
111    [TestCategory("TreeHashing")]
112    public void InverseFactorCancelationSimple() {
113      // 1/a * b * a * a
114      SymbolString s1 = new SymbolString(new Symbol[] { varA, grammar.Inv, varB, grammar.Multiplication, varA, grammar.Multiplication, varA, grammar.Multiplication });
115      // a * b
116      SymbolString s2 = new SymbolString(new Symbol[] { varA, varB, grammar.Multiplication });
117
118      int hash1 = grammar.Hasher.CalcHashCode(s1);
119      int hash2 = grammar.Hasher.CalcHashCode(s2);
120
121      Assert.AreEqual(hash1, hash2);
122    }
123
124    [TestMethod]
125    [TestCategory("TreeHashing")]
126    public void InverseFactorCancelationComplex() {
127      SymbolString s1 = new SymbolString(new Symbol[] { varA, grammar.Sin, varA, varA, grammar.Multiplication, varA, grammar.Addition, grammar.Sin, grammar.Addition });
128      SymbolString s2 = new SymbolString(new Symbol[] { varA, varA, varA, grammar.Multiplication, grammar.Addition, grammar.Sin, varA, grammar.Inv, varA, grammar.Sin, varA, grammar.Multiplication, grammar.Multiplication, grammar.Addition });
129
130      int hash1 = grammar.Hasher.CalcHashCode(s1);
131      int hash2 = grammar.Hasher.CalcHashCode(s2);
132
133      Assert.AreEqual(hash1, hash2);
134    }
135
136    // Constants
137    [TestMethod]
138    [TestCategory("TreeHashing")]
139    public void SimpleConst() {
140      SymbolString s1 = new SymbolString(new Symbol[] { c, varA, grammar.Multiplication, c, grammar.Addition});
141      SymbolString s2 = new SymbolString(new Symbol[] { c, varA, grammar.Multiplication, c, varA, grammar.Multiplication, grammar.Addition, c, grammar.Addition });
142
143      int hash1 = grammar.Hasher.CalcHashCode(s1);
144      int hash2 = grammar.Hasher.CalcHashCode(s2);
145
146      Assert.AreEqual(hash1, hash2);
147    }
148
149    /* DEPRECATED; SINCE WE DO NOT ALLOW COMPOUND DIVISIONS
150    [TestMethod]
151    [TestCategory("TreeHashing")]
152    public void CompoundInverseCancellationToSingleInverse() {
153      SymbolString s1 = new SymbolString(new Symbol[] { varA, varB, grammar.Addition, grammar.Inv, grammar.Inv, grammar.Inv });
154      SymbolString s2 = new SymbolString(new Symbol[] { varA, varB, grammar.Addition, grammar.Inv });
155
156      int hash1 = grammar.CalcHashCode(s1);
157      int hash2 = grammar.CalcHashCode(s2);
158
159      Assert.AreEqual(hash1, hash2);
160    }
161
162    [TestMethod]
163    [TestCategory("TreeHashing")]
164    public void CompoundInverseCancellationToDivisor() {
165      SymbolString s1 = new SymbolString(new Symbol[] { varA, varB, grammar.Addition, grammar.Inv, grammar.Inv });
166      SymbolString s2 = new SymbolString(new Symbol[] { varA, varB, grammar.Addition });
167
168      int hash1 = grammar.CalcHashCode(s1);
169      int hash2 = grammar.CalcHashCode(s2);
170
171      Assert.AreEqual(hash1, hash2);
172    }
173
174    [TestMethod]
175    [TestCategory("TreeHashing")]
176    public void UncancelableCompoundInverse() {
177      // 1 / ( 1/b + sin(a*c) )
178      SymbolString s1 = new SymbolString(new Symbol[] { varB, grammar.Inv, varA, varC, grammar.Multiplication, grammar.Sin, grammar.Addition, grammar.Inv });
179      // b + sin(a*c)
180      SymbolString s2 = new SymbolString(new Symbol[] { varB, varA, varC, grammar.Multiplication, grammar.Sin, grammar.Addition });
181
182      int hash1 = grammar.CalcHashCode(s1);
183      int hash2 = grammar.CalcHashCode(s2);
184
185      Assert.AreNotEqual(hash1, hash2);
186    }*/
187  }
188}
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