Dotnet/FastRng
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Added decision support

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This commit is contained in:
Thorsten Sommer 2020-11-07 22:43:57 +01:00
parent 1df9398746
commit 34fad9dddd
8 changed files with 154 additions and 0 deletions
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6
FastRng/Double/Distributions/Distribution.cs
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@ -65,5 +65,11 @@ namespace FastRng.Double.Distributions
}
public async ValueTask<double> NextNumber(CancellationToken cancel = default) => await this.NextNumber(0.0, 1.0, cancel);
public async ValueTask<bool> HasDecisionBeenMade(double above, double below = 1, CancellationToken cancel = default)
{
var number = await this.NextNumber(cancel);
return number > above && number < below;
}
}
}

2
FastRng/Double/Distributions/IDistribution.cs
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@ -14,5 +14,7 @@ namespace FastRng.Double.Distributions
public ValueTask<double> NextNumber(double rangeStart, double rangeEnd, CancellationToken cancel = default);
public ValueTask<double> NextNumber(CancellationToken cancel = default);
public ValueTask<bool> HasDecisionBeenMade(double above, double below = 1.0, CancellationToken cancel = default);
}
}

6
FastRng/Double/Distributions/Uniform.cs
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@ -61,5 +61,11 @@ namespace FastRng.Double.Distributions
}
public async ValueTask<double> NextNumber(CancellationToken cancel = default) => await this.NextNumber(0.0, 1.0, cancel);
public async ValueTask<bool> HasDecisionBeenMade(double above, double below = 1, CancellationToken cancel = default)
{
var number = await this.NextNumber(cancel);
return number > above && number < below;
}
}
}

6
FastRng/Float/Distributions/Distribution.cs
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@ -65,5 +65,11 @@ namespace FastRng.Float.Distributions
}
public async ValueTask<float> NextNumber(CancellationToken cancel = default) => await this.NextNumber(0.0f, 1.0f, cancel);
public async ValueTask<bool> HasDecisionBeenMade(float above, float below = 1, CancellationToken cancel = default)
{
var number = await this.NextNumber(cancel);
return number > above && number < below;
}
}
}

2
FastRng/Float/Distributions/IDistribution.cs
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@ -14,5 +14,7 @@ namespace FastRng.Float.Distributions
public ValueTask<float> NextNumber(float rangeStart, float rangeEnd, CancellationToken cancel = default);
public ValueTask<float> NextNumber(CancellationToken cancel = default);
public ValueTask<bool> HasDecisionBeenMade(float above, float below = 1.0f, CancellationToken cancel = default);
}
}

6
FastRng/Float/Distributions/Uniform.cs
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@ -61,5 +61,11 @@ namespace FastRng.Float.Distributions
}
public async ValueTask<float> NextNumber(CancellationToken cancel = default) => await this.NextNumber(0.0f, 1.0f, cancel);
public async ValueTask<bool> HasDecisionBeenMade(float above, float below = 1, CancellationToken cancel = default)
{
var number = await this.NextNumber(cancel);
return number > above && number < below;
}
}
}

62
FastRngTests/Double/DecisionTester.cs Normal file
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@ -0,0 +1,62 @@
using System;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Threading.Tasks;
using FastRng.Double;
using NUnit.Framework;
using Uniform = FastRng.Double.Distributions.Uniform;
namespace FastRngTests.Double
{
[ExcludeFromCodeCoverage]
public class DecisionTester
{
[Test]
[Category(TestCategories.COVER)]
[Category(TestCategories.NORMAL)]
public async Task DecisionUniform01()
{
using var rng = new MultiThreadedRng();
var dist = new Uniform(rng);
var neededCoinTossesA = 0;
var neededCoinTossesB = 0;
var neededCoinTossesC = 0;
for(var n = 0; n < 100; n++) while (!await dist.HasDecisionBeenMade(0.0f, 0.1f)) neededCoinTossesA++;
for(var n = 0; n < 100; n++) while (!await dist.HasDecisionBeenMade(0.5f, 0.6f)) neededCoinTossesB++;
for(var n = 0; n < 100; n++) while (!await dist.HasDecisionBeenMade(0.8f, 0.9f)) neededCoinTossesC++;
var values = new[] {neededCoinTossesA, neededCoinTossesB, neededCoinTossesC};
var max = values.Max();
var min = values.Min();
TestContext.WriteLine($"Coin tosses: a={neededCoinTossesA}, b={neededCoinTossesB}, c={neededCoinTossesC}");
Assert.That(max - min, Is.LessThanOrEqualTo(250));
}
[Test]
[Category(TestCategories.COVER)]
[Category(TestCategories.NORMAL)]
public async Task DecisionWeibull01()
{
using var rng = new MultiThreadedRng();
var dist = new FastRng.Double.Distributions.WeibullK05La1(rng);
var neededCoinTossesA = 0;
var neededCoinTossesB = 0;
var neededCoinTossesC = 0;
for(var n = 0; n < 100; n++) while (!await dist.HasDecisionBeenMade(0.0f, 0.1f)) neededCoinTossesA++;
for(var n = 0; n < 100; n++) while (!await dist.HasDecisionBeenMade(0.5f, 0.6f)) neededCoinTossesB++;
for(var n = 0; n < 100; n++) while (!await dist.HasDecisionBeenMade(0.8f, 0.9f)) neededCoinTossesC++;
var values = new[] {neededCoinTossesA, neededCoinTossesB, neededCoinTossesC};
var max = values.Max();
var min = values.Min();
TestContext.WriteLine($"Coin tosses: a={neededCoinTossesA}, b={neededCoinTossesB}, c={neededCoinTossesC}");
Assert.That(max - min, Is.LessThanOrEqualTo(2_800));
}
}
}

64
FastRngTests/Float/DecisionTester.cs Normal file
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@ -0,0 +1,64 @@
using System;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
using System.Threading.Tasks;
using FastRng.Float;
using FastRng.Float.Distributions;
using FastRngTests.Float.Distributions;
using NUnit.Framework;
using Uniform = FastRng.Float.Distributions.Uniform;
namespace FastRngTests.Float
{
[ExcludeFromCodeCoverage]
public class DecisionTester
{
[Test]
[Category(TestCategories.COVER)]
[Category(TestCategories.NORMAL)]
public async Task DecisionUniform01()
{
using var rng = new MultiThreadedRng();
var dist = new Uniform(rng);
var neededCoinTossesA = 0;
var neededCoinTossesB = 0;
var neededCoinTossesC = 0;
for(var n = 0; n < 100; n++) while (!await dist.HasDecisionBeenMade(0.0f, 0.1f)) neededCoinTossesA++;
for(var n = 0; n < 100; n++) while (!await dist.HasDecisionBeenMade(0.5f, 0.6f)) neededCoinTossesB++;
for(var n = 0; n < 100; n++) while (!await dist.HasDecisionBeenMade(0.8f, 0.9f)) neededCoinTossesC++;
var values = new[] {neededCoinTossesA, neededCoinTossesB, neededCoinTossesC};
var max = values.Max();
var min = values.Min();
TestContext.WriteLine($"Coin tosses: a={neededCoinTossesA}, b={neededCoinTossesB}, c={neededCoinTossesC}");
Assert.That(max - min, Is.LessThanOrEqualTo(250));
}
[Test]
[Category(TestCategories.COVER)]
[Category(TestCategories.NORMAL)]
public async Task DecisionWeibull01()
{
using var rng = new MultiThreadedRng();
var dist = new FastRng.Float.Distributions.WeibullK05La1(rng);
var neededCoinTossesA = 0;
var neededCoinTossesB = 0;
var neededCoinTossesC = 0;
for(var n = 0; n < 100; n++) while (!await dist.HasDecisionBeenMade(0.0f, 0.1f)) neededCoinTossesA++;
for(var n = 0; n < 100; n++) while (!await dist.HasDecisionBeenMade(0.5f, 0.6f)) neededCoinTossesB++;
for(var n = 0; n < 100; n++) while (!await dist.HasDecisionBeenMade(0.8f, 0.9f)) neededCoinTossesC++;
var values = new[] {neededCoinTossesA, neededCoinTossesB, neededCoinTossesC};
var max = values.Max();
var min = values.Min();
TestContext.WriteLine($"Coin tosses: a={neededCoinTossesA}, b={neededCoinTossesB}, c={neededCoinTossesC}");
Assert.That(max - min, Is.LessThanOrEqualTo(2_800));
}
}
}