Last change
on this file since 11730 was
11730,
checked in by gkronber, 9 years ago
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#2283: several major extensions for grammatical optimization
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File size:
1.5 KB
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Rev | Line | |
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[11730] | 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.Linq;
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| 5 | using System.Text;
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| 6 | using System.Threading.Tasks;
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| 7 | using HeuristicLab.Common;
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| 8 |
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| 9 | namespace HeuristicLab.Algorithms.Bandits {
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| 10 | public class GenericThompsonSamplingPolicy : BanditPolicy {
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| 11 | private readonly Random random;
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| 12 | private readonly IModel model;
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| 13 |
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| 14 | public GenericThompsonSamplingPolicy(Random random, int numActions, IModel model)
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| 15 | : base(numActions) {
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| 16 | this.random = random;
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| 17 | this.model = model;
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| 18 | }
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| 19 |
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| 20 | public override int SelectAction() {
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| 21 | Debug.Assert(Actions.Any());
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| 22 | var maxR = double.NegativeInfinity;
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| 23 | int bestAction = -1;
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| 24 | var expRewards = model.SampleExpectedRewards(random);
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| 25 | foreach (var a in Actions) {
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| 26 | var r = expRewards[a];
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| 27 | if (r > maxR) {
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| 28 | maxR = r;
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| 29 | bestAction = a;
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| 30 | }
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| 31 | }
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| 32 | return bestAction;
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| 33 | }
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| 34 |
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| 35 | public override void UpdateReward(int action, double reward) {
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| 36 | Debug.Assert(Actions.Contains(action));
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| 37 |
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| 38 | model.Update(action, reward);
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| 39 | }
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| 40 |
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| 41 | public override void DisableAction(int action) {
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| 42 | base.DisableAction(action);
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| 43 | model.Disable(action);
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| 44 | }
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| 45 |
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| 46 | public override void Reset() {
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| 47 | base.Reset();
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| 48 | model.Reset();
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| 49 | }
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| 50 |
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| 51 | public override void PrintStats() {
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| 52 | model.PrintStats();
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| 53 | }
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| 54 |
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| 55 | public override string ToString() {
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| 56 | return string.Format("GenericThompsonSamplingPolicy({0})", model);
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| 57 | }
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| 58 | }
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| 59 | }
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