mirror of
https://github.com/furyfire/trueskill.git
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57 lines
2.1 KiB
PHP
57 lines
2.1 KiB
PHP
<?php
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namespace Moserware\Skills\TrueSkill\Layers;
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require_once(dirname(__FILE__) . "/../../FactorGraphs/Variable.php");
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require_once(dirname(__FILE__) . "/../TrueSkillFactorGraph.php");
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require_once(dirname(__FILE__) . "/../Factors/GaussianWeightedSumFactor.php");
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require_once(dirname(__FILE__) . "/TrueSkillFactorGraphLayer.php");
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use Moserware\Skills\FactorGraphs\Variable;
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use Moserware\Skills\TrueSkill\DrawMargin;
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use Moserware\Skills\TrueSkill\TrueSkillFactorGraph;
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use Moserware\Skills\TrueSkill\Factors\GaussianWeightedSumFactor;
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class TeamPerformancesToTeamPerformanceDifferencesLayer extends TrueSkillFactorGraphLayer
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{
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public function __construct(TrueSkillFactorGraph &$parentGraph)
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{
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parent::__construct($parentGraph);
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}
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public function buildLayer()
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{
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$inputVariablesGroups = &$this->getInputVariablesGroups();
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$inputVariablesGroupsCount = count($inputVariablesGroups);
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$outputVariablesGroup = &$this->getOutputVariablesGroups();
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for ($i = 0; $i < $inputVariablesGroupsCount - 1; $i++)
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{
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$strongerTeam = &$inputVariablesGroups[$i][0];
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$weakerTeam = &$inputVariablesGroups[$i + 1][0];
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$currentDifference = &$this->createOutputVariable();
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$newDifferencesFactor = $this->createTeamPerformanceToDifferenceFactor($strongerTeam, $weakerTeam, $currentDifference);
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$this->addLayerFactor($newDifferencesFactor);
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// REVIEW: Does it make sense to have groups of one?
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$outputVariablesGroup[] = array($currentDifference);
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}
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}
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private function createTeamPerformanceToDifferenceFactor(
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Variable &$strongerTeam, Variable &$weakerTeam, Variable &$output)
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{
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$teams = array($strongerTeam, $weakerTeam);
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$weights = array(1.0, -1.0);
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return new GaussianWeightedSumFactor($output, $teams, $weights);
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}
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private function &createOutputVariable()
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{
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$outputVariable = &$this->getParentFactorGraph()->getVariableFactory()->createBasicVariable("Team performance difference");
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return $outputVariable;
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}
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}
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?>
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