1 | #region License Information
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2 | /* HeuristicLab
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3 | * Copyright (C) 2002-2016 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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4 | *
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5 | * This file is part of HeuristicLab.
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6 | *
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7 | * HeuristicLab is free software: you can redistribute it and/or modify
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8 | * it under the terms of the GNU General Public License as published by
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9 | * the Free Software Foundation, either version 3 of the License, or
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10 | * (at your option) any later version.
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11 | *
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12 | * HeuristicLab is distributed in the hope that it will be useful,
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13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 | * GNU General Public License for more details.
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16 | *
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17 | * You should have received a copy of the GNU General Public License
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18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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19 | */
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20 | #endregion
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21 |
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22 | using System;
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23 | using System.Collections.Generic;
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24 | using System.Linq;
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25 | using HeuristicLab.Common;
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26 | using HeuristicLab.Core;
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27 | using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
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28 |
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29 | namespace HeuristicLab.Problems.SurrogateProblem {
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30 |
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31 | /// <summary>
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32 | /// this is not a proper distance
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33 | /// </summary>
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34 | [StorableClass]
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35 | [Item("InnerProductDistance", "The Angluar Distance as defined as a normalized distance measure dependent on the angle between two vectors.\nIt is designed for vectors with all positive coordinates")]
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36 | public class InnerProductDistance : DistanceBase<IReadOnlyList<double>> {
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37 |
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38 | #region HLConstructors
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39 | [StorableConstructor]
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40 | protected InnerProductDistance(bool deserializing) : base(deserializing) { }
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41 | protected InnerProductDistance(InnerProductDistance original, Cloner cloner)
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42 | : base(original, cloner) { }
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43 | public InnerProductDistance() { }
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44 | public override IDeepCloneable Clone(Cloner cloner) {
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45 | return new InnerProductDistance(this, cloner);
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46 | }
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47 | #endregion
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48 |
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49 | #region statics
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50 | public static double GetDistance(IReadOnlyList<double> point1, IReadOnlyList<double> point2) {
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51 | if (point1.Count != point2.Count) throw new ArgumentException("Inner Product distance not defined on vectors of different length");
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52 | return point1.Zip(point2, (x, y) => x * y).Sum();
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53 | }
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54 | public static double GetDistance(IEnumerable<double> a, IEnumerable<double> b, double threshold) {
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55 | return GetDistance(a.ToArray(), b.ToArray()); //no shortcut evaluation for Inner Product (summands may be negative => no way of telling if threshold is reached or not)
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56 | }
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57 | #endregion
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58 | public override double Get(IReadOnlyList<double> a, IReadOnlyList<double> b) {
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59 | return GetDistance(a, b);
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60 | }
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61 | public override double Get(IReadOnlyList<double> a, IReadOnlyList<double> b, double threshold) {
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62 | return GetDistance(a, b, threshold);
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63 | }
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64 | }
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65 | }
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