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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Rev | Line | |
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[12893] | 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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