mirror of
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53 lines
1.9 KiB
PHP
53 lines
1.9 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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$inputVariablesGroup = $this->getInputVariablesGroups();
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$inputVariablesGroupCount = count($inputVariablesGroup);
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for ($i = 0; $i < $inputVariablesGroupCount - 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 = $this->createOutputVariable();
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$this->addLayerFactor($this->createTeamPerformanceToDifferenceFactor($strongerTeam, $weakerTeam, currentDifference));
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// REVIEW: Does it make sense to have groups of one?
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$outputVariablesGroup = $this->getOutputVariablesGroups();
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$outputVariablesGroup[] = $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 $output)
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{
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return new GaussianWeightedSumFactor($output, array($strongerTeam, $weakerTeam), array(1.0, -1.0));
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}
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private function createOutputVariable()
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{
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return $this->getParentFactorGraph()->getVariableFactory()->createBasicVariable("Team performance difference");
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}
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}
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?>
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