[14409] | 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.Core;
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| 26 | using HeuristicLab.Random;
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| 27 |
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| 28 | namespace HeuristicLab.ExpressionGenerator {
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| 29 | public abstract class ExpressionTemplate {
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[14411] | 30 | private List<Tuple<Expression, double>> arguments;
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| 31 | private readonly Func<IEnumerable<double>, double> transform;
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[14480] | 32 | public string Label { get; set; }
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[14409] | 33 |
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[14480] | 34 | protected Expression Instantiate(string name, IRandom random, int n, bool sampleWithRepetition = false) {
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[14411] | 35 | var weights = arguments.Select(x => x.Item2);
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| 36 | var args = sampleWithRepetition
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| 37 | ? arguments.SampleProportional(random, n, weights).Select(x => x.Item1)
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| 38 | : arguments.SampleProportionalWithoutRepetition(random, n, weights).Select(x => x.Item1);
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[14480] | 39 | var func = Expression.Function(name, transform, args);
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| 40 | func.Label = Label;
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| 41 | return func;
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[14411] | 42 | }
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| 43 |
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[14448] | 44 | public abstract Expression Instantiate(string name, IRandom random, bool sampleWithRepetition = false);
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[14409] | 45 |
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[14448] | 46 | protected ExpressionTemplate(Func<IEnumerable<double>, double> transform) {
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[14409] | 47 | this.transform = transform;
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| 48 | }
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| 49 |
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[14485] | 50 | public void AddArgument(Expression expression, double weight = 1d) {
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[14409] | 51 | arguments = arguments ?? new List<Tuple<Expression, double>>();
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[14485] | 52 | arguments.Add(Tuple.Create(expression, weight));
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[14409] | 53 | }
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| 54 |
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| 55 | public void AddArguments(IEnumerable<Expression> expressions) {
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| 56 | arguments = arguments ?? new List<Tuple<Expression, double>>();
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| 57 | arguments.AddRange(expressions.Select(x => Tuple.Create(x, 1d)));
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| 58 | }
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| 59 |
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[14485] | 60 | public void AddArguments(IEnumerable<Expression> expressions, IEnumerable<double> weights) {
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[14409] | 61 | arguments = arguments ?? new List<Tuple<Expression, double>>();
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[14485] | 62 | arguments.AddRange(expressions.Zip(weights, Tuple.Create));
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[14409] | 63 | }
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| 64 | }
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| 65 |
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| 66 | public class RandomArityTemplate : ExpressionTemplate {
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| 67 | private readonly IRandom arityDistribution;
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| 68 |
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[14448] | 69 | public RandomArityTemplate(Func<IEnumerable<double>, double> transform, IRandom arityDistribution) : base(transform) {
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[14409] | 70 | this.arityDistribution = arityDistribution;
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| 71 | }
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| 72 |
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[14448] | 73 | public override Expression Instantiate(string name, IRandom random, bool sampleWithRepetition = false) {
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[14409] | 74 | var arity = (int)Math.Round(arityDistribution.NextDouble());
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[14448] | 75 | return Instantiate(name, random, arity, sampleWithRepetition);
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[14409] | 76 | }
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| 77 | }
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| 78 |
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| 79 | public class FixedArityTemplate : ExpressionTemplate {
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| 80 | private readonly int arity;
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[14448] | 81 | public FixedArityTemplate(Func<IEnumerable<double>, double> transform, int arity) : base(transform) {
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[14409] | 82 | this.arity = arity;
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| 83 | }
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| 84 |
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[14448] | 85 | public override Expression Instantiate(string name, IRandom random, bool sampleWithRepetition = false) {
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| 86 | return Instantiate(name, random, arity, sampleWithRepetition);
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[14409] | 87 | }
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| 88 | }
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[14411] | 89 | }
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