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43 lines
1.6 KiB
PHP
43 lines
1.6 KiB
PHP
<?php
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namespace Moserware\Skills\TrueSkill\Factors;
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require_once(dirname(__FILE__) . "/../../FactorGraphs/Factor.php");
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require_once(dirname(__FILE__) . "/../../FactorGraphs/Message.php");
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require_once(dirname(__FILE__) . "/../../FactorGraphs/Variable.php");
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require_once(dirname(__FILE__) . "/../../Numerics/GaussianDistribution.php");
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use Moserware\Numerics\GaussianDistribution;
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use Moserware\Skills\FactorGraphs\Factor;
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use Moserware\Skills\FactorGraphs\Message;
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use Moserware\Skills\FactorGraphs\Variable;
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abstract class GaussianFactor extends Factor
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{
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protected function __construct($name)
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{
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parent::__construct($name);
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}
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/// Sends the factor-graph message with and returns the log-normalization constant
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protected function sendMessageVariable(Message &$message, Variable &$variable)
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{
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$marginal = &$variable->getValue();
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$messageValue = &$message->getValue();
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$logZ = GaussianDistribution::logProductNormalization($marginal, $messageValue);
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$variable->setValue(GaussianDistribution::multiply($marginal, $messageValue));
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return $logZ;
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}
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public function &createVariableToMessageBinding(Variable &$variable)
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{
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$binding = &parent::createVariableToMessageBindingWithMessage($variable,
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new Message(
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GaussianDistribution::fromPrecisionMean(0, 0),
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sprintf("message from %s to %s", $this, $variable)));
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return $binding;
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}
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}
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?>
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