Last change
on this file since 13780 was
12893,
checked in by gkronber, 9 years ago
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#2283: experiments on grammatical optimization algorithms (maxreward instead of avg reward, ...)
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File size:
1.2 KB
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1 | using System;
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2 | using System.Collections.Generic;
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3 | using System.Diagnostics;
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4 | using System.Diagnostics.Contracts;
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5 | using System.Linq;
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6 | using System.Text;
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7 | using System.Threading.Tasks;
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8 | using HeuristicLab.Common;
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9 |
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10 | namespace HeuristicLab.Algorithms.Bandits.Models {
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11 | // mixture of two models with mixture weights
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12 | public class MixtureModel : IModel {
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13 |
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14 | private readonly IModel u;
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15 | private readonly IModel v;
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16 | private readonly double w;
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17 |
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18 | // w is the weight for u (the weight for v is 1-w)
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19 | public MixtureModel(IModel u, IModel v, double w) {
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20 | Contract.Assert(w >= 0.0 && w <= 1.0);
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21 | this.u = u;
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22 | this.v = v;
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23 | this.w = w;
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24 | }
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25 |
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26 | public double Sample(Random random) {
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27 | if (random.NextDouble() <= w) {
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28 | return u.Sample(random);
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29 | } else {
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30 | return v.Sample(random);
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31 | }
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32 | }
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33 |
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34 | public void Update(double reward) {
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35 | throw new NotSupportedException();
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36 | }
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37 |
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38 | public void Reset() {
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39 | throw new NotSupportedException();
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40 | }
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41 |
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42 | public object Clone() {
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43 | return new MixtureModel(u, v, w);
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44 | }
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45 |
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46 | public override string ToString() {
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47 | return string.Format("Mixture({0},{1},{2:F2})", u, v, w);
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48 | }
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49 | }
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50 | }
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