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source: branches/TSNE/HeuristicLab.Algorithms.DataAnalysis/3.4/Interfaces/TSNEInterfaces/IDistance.cs @ 14788

Last change on this file since 14788 was 14767, checked in by gkronber, 7 years ago

#2700: made some changes while reviewing the code

File size: 1.5 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2016 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
22using System.Collections.Generic;
23using HeuristicLab.Core;
24
25namespace HeuristicLab.Algorithms.DataAnalysis {
26  public interface IDistance<in T> : IItem {
27    /// <summary>
28    /// Calculates a distance measure between two objects.
29    /// 1.) non-negative d(x,y) >= 0
30    /// 2.) symmetric d(x,y) = d(y,x)
31    /// 3.) zero-reflexive d(x,x) = 0;
32    /// </summary>
33    /// <returns>d(x,y)</returns>
34    double Get(T x, T y);
35
36    /// <summary>
37    /// Returns a comparator wich compares the distances to item. (allows for sorting nearest/farthest neighbours)
38    /// </summary>
39    /// <param name="item"></param>
40    /// <returns></returns>
41    IComparer<T> GetDistanceComparer(T item);
42  }
43}
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