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Finished first homework.
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ojanacek committed Oct 21, 2015
1 parent 1643330 commit cb643a2
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Showing 12 changed files with 468 additions and 128 deletions.
0 KnapsackProblem.BruteForce/App.config → KnapsackProblem.BFvsHeuristics/App.config
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File renamed without changes.
98 changes: 52 additions & 46 deletions ...teForce/KnapsackProblem.BruteForce.csproj → ...ics/KnapsackProblem.BFvsHeuristics.csproj
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<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
<PropertyGroup>
<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
<ProjectGuid>{F1874205-A569-4348-9791-898A2F161DEF}</ProjectGuid>
<OutputType>Exe</OutputType>
<AppDesignerFolder>Properties</AppDesignerFolder>
<RootNamespace>KnapsackProblem.BruteForce</RootNamespace>
<AssemblyName>KnapsackProblem.BruteForce</AssemblyName>
<TargetFrameworkVersion>v4.6</TargetFrameworkVersion>
<FileAlignment>512</FileAlignment>
<AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
<PlatformTarget>AnyCPU</PlatformTarget>
<DebugSymbols>true</DebugSymbols>
<DebugType>full</DebugType>
<Optimize>false</Optimize>
<OutputPath>bin\Debug\</OutputPath>
<DefineConstants>DEBUG;TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
<PlatformTarget>AnyCPU</PlatformTarget>
<DebugType>pdbonly</DebugType>
<Optimize>true</Optimize>
<OutputPath>bin\Release\</OutputPath>
<DefineConstants>TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
</PropertyGroup>
<ItemGroup>
<Reference Include="System" />
</ItemGroup>
<ItemGroup>
<Compile Include="Program.cs" />
<Compile Include="Properties\AssemblyInfo.cs" />
</ItemGroup>
<ItemGroup>
<None Include="App.config" />
</ItemGroup>
<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
<PropertyGroup>
<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
<ProjectGuid>{F1874205-A569-4348-9791-898A2F161DEF}</ProjectGuid>
<OutputType>Exe</OutputType>
<AppDesignerFolder>Properties</AppDesignerFolder>
<RootNamespace>KnapsackProblem.BFvsHeuristics</RootNamespace>
<AssemblyName>KnapsackProblem.BFvsHeuristics</AssemblyName>
<TargetFrameworkVersion>v4.6</TargetFrameworkVersion>
<FileAlignment>512</FileAlignment>
<AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
<PlatformTarget>AnyCPU</PlatformTarget>
<DebugSymbols>true</DebugSymbols>
<DebugType>full</DebugType>
<Optimize>false</Optimize>
<OutputPath>bin\Debug\</OutputPath>
<DefineConstants>DEBUG;TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
<PlatformTarget>AnyCPU</PlatformTarget>
<DebugType>pdbonly</DebugType>
<Optimize>true</Optimize>
<OutputPath>bin\Release\</OutputPath>
<DefineConstants>TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
</PropertyGroup>
<ItemGroup>
<Reference Include="System" />
</ItemGroup>
<ItemGroup>
<Compile Include="Program.cs" />
<Compile Include="Properties\AssemblyInfo.cs" />
</ItemGroup>
<ItemGroup>
<None Include="App.config" />
</ItemGroup>
<ItemGroup>
<ProjectReference Include="..\KnapsackProblem.Common\KnapsackProblem.Common.csproj">
<Project>{d69e0ecc-70c5-41c3-abba-e4f385e6982a}</Project>
<Name>KnapsackProblem.Common</Name>
</ProjectReference>
</ItemGroup>
<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
<!-- To modify your build process, add your task inside one of the targets below and uncomment it.
Other similar extension points exist, see Microsoft.Common.targets.
<Target Name="BeforeBuild">
</Target>
<Target Name="AfterBuild">
</Target>
-->
-->
</Project>
175 changes: 175 additions & 0 deletions KnapsackProblem.BFvsHeuristics/Program.cs
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using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Text;
using KnapsackProblem.Common;

namespace KnapsackProblem.BFvsHeuristics
{
class Program
{
static void Main(string[] args)
{
if (args.Length == 0)
{
Console.WriteLine("No path provided.");
return;
}

MeasureRelativeErrors(args[0]);
}

/// <summary> Generate file with results to check against referece results. </summary>
static void SaveResultsForCheck(string filePath)
{
if (!File.Exists(filePath))
{
Console.WriteLine("File '{0}' does not exist.", filePath);
return;
}

var sb = new StringBuilder();
foreach (var knapsack in KnapsackLoader.LoadKnapsacks(filePath, 500))
{
//var result = KnapsackProblemSolver.BruteForce(knapsack);
var result = KnapsackProblemSolver.PriceToWeightRatioHeuristics(knapsack);
sb.AppendLine($"{knapsack.Id} {knapsack.InstanceSize} {result.Item1} {result.Item2.ToReverseBinary(knapsack.InstanceSize)}");
}

File.WriteAllText("result.txt", sb.ToString());
}

static void MeasureBFTimePerInstanceSize(string directoryPath, int knapsacksPerInstanceSize, TimeSpan maxTimePerInstance)
{
if (!Directory.Exists(directoryPath))
{
Console.WriteLine("Directory '{0}' does not exist.", directoryPath);
return;
}

var knapsacksFiles = Directory.EnumerateFiles(directoryPath, "knap_*.dat").Where(f => !f.Contains("sol")).ToList();

// warmup
foreach (var knapsack in KnapsackLoader.LoadKnapsacks(knapsacksFiles.First(), 50))
{
var result = KnapsackProblemSolver.BruteForce(knapsack);
Console.WriteLine(result); // so that it's not optimized away
}
GC.Collect();

// measure
var bfWatch = new Stopwatch();
int originalKnapsacksPerInstanceSize = knapsacksPerInstanceSize;

for (int i = 0; i < knapsacksFiles.Count; i++)
{
string file = knapsacksFiles[i];
int instanceSize = 0;

Console.WriteLine("Starting {0}", file);
int j = 0;

foreach (var knapsack in KnapsackLoader.LoadKnapsacks(file, knapsacksPerInstanceSize))
{
instanceSize = knapsack.InstanceSize;
bfWatch.Start();
KnapsackProblemSolver.BruteForce(knapsack);
bfWatch.Stop();
Console.WriteLine("--finished {0}: {1}", j, bfWatch.ElapsedMilliseconds);
}

double instanceAverage = bfWatch.ElapsedMilliseconds / (double)knapsacksPerInstanceSize;
if (Math.Abs(instanceAverage) < 0.0000001)
{
i--;
knapsacksPerInstanceSize = 500;
continue;
}

File.Create($"{instanceSize};{instanceAverage}.txt");

knapsacksPerInstanceSize = originalKnapsacksPerInstanceSize;
bfWatch.Reset();
GC.Collect();
if (instanceAverage > maxTimePerInstance.TotalMilliseconds)
break;
}
}

static void MeasureHeuristicsTimePerInstanceSize(string directoryPath)
{
if (!Directory.Exists(directoryPath))
{
Console.WriteLine("Directory '{0}' does not exist.", directoryPath);
return;
}

var knapsacksFiles = Directory.EnumerateFiles(directoryPath, "knap_*.dat").Where(f => !f.Contains("sol")).ToList();

// warmup
foreach (var knapsack in KnapsackLoader.LoadKnapsacks(knapsacksFiles.First(), 500))
{
var result = KnapsackProblemSolver.PriceToWeightRatioHeuristics(knapsack);
Console.WriteLine(result); // so that it's not optimized away
}
GC.Collect();

// measure
var bfWatch = new Stopwatch();
var repeat = 50;

foreach (string file in knapsacksFiles)
{
int instanceSize = 0;
for (int i = 0; i < repeat; i++)
{
foreach (var knapsack in KnapsackLoader.LoadKnapsacks(file, 500))
{
instanceSize = knapsack.InstanceSize;
bfWatch.Start();
KnapsackProblemSolver.PriceToWeightRatioHeuristics(knapsack);
bfWatch.Stop();
}
}

double instanceAverage = bfWatch.ElapsedMilliseconds / (500d * repeat);

File.Create($"{instanceSize};{instanceAverage}.txt");

bfWatch.Reset();
GC.Collect();
}
}

static void MeasureRelativeErrors(string directoryPath)
{
if (!Directory.Exists(directoryPath))
{
Console.WriteLine("Directory '{0}' does not exist.", directoryPath);
return;
}

var knapsacksFiles = Directory.EnumerateFiles(directoryPath, "knap_*.dat").ToList();
var relativeErrors = new List<double>();

for (int i = 0; i < knapsacksFiles.Count; i += 2)
{
var file = knapsacksFiles[i];
var solutionFile = knapsacksFiles[i + 1];
var bestPrices = File.ReadAllLines(solutionFile).Select(line => double.Parse(line.Split()[2])).ToList();

var knapsacks = KnapsackLoader.LoadKnapsacks(file, 500).ToList();
for (int j = 0; j < knapsacks.Count; j++)
{
var result = KnapsackProblemSolver.PriceToWeightRatioHeuristics(knapsacks[j]);
relativeErrors.Add((bestPrices[j] - result.Item1) / bestPrices[j]);
}
}

Console.WriteLine($"Average relative error from {relativeErrors.Count} different errors is {relativeErrors.Average()}.");
Console.WriteLine("Max relative error is {0}.", relativeErrors.Max());
}
}
}
0 ...lem.BruteForce/Properties/AssemblyInfo.cs → ...BFvsHeuristics/Properties/AssemblyInfo.cs
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15 changes: 0 additions & 15 deletions KnapsackProblem.BruteForce/Program.cs
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This file was deleted.

30 changes: 30 additions & 0 deletions KnapsackProblem.Common/Helpers.cs
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using System.Text;

namespace KnapsackProblem.Common
{
public static class Helpers
{
/// <summary>
/// Returns a specific binary format of a ulong value.
/// </summary>
public static string ToReverseBinary(this ulong value, int binaryDigitsCount)
{
var sb = new StringBuilder();
int binaryDigits = 0;
while (value != 0)
{
sb.Append((value & 1) == 1 ? " 1" : " 0");
value >>= 1;
binaryDigits++;
}

while (binaryDigits < binaryDigitsCount)
{
sb.Append(" 0");
binaryDigits++;
}

return sb.ToString();
}
}
}
23 changes: 23 additions & 0 deletions KnapsackProblem.Common/Knapsack.cs
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using System.Collections.Generic;
using System.Linq;

namespace KnapsackProblem.Common
{
public sealed class Knapsack
{
public short Id { get; }
public short Capacity { get; }
public int InstanceSize => Items.Count;

public List<KnapsackItem> Items { get; }

public Knapsack(short id, short capacity, IEnumerable<KnapsackItem> items)
{
Id = id;
Capacity = capacity;
Items = items.ToList();
}

public override string ToString() => $"knapsack {Id}, capacity: {Capacity}";
}
}
16 changes: 16 additions & 0 deletions KnapsackProblem.Common/KnapsackItem.cs
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namespace KnapsackProblem.Common
{
public struct KnapsackItem
{
public ushort Weight { get; }
public ushort Price { get; }

public KnapsackItem(ushort weight, ushort price)
{
Weight = weight;
Price = price;
}

public override string ToString() => $"weight: {Weight}, price: {Price}";
}
}
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