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Fix a few bugs in GaussianWeightedSumFactor

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This commit is contained in:
Jeff Moser 2010-09-25 20:12:38 -04:00
parent f7d76b02a9
commit eee44c9746
1 changed files with 18 additions and 8 deletions
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26
PHPSkills/TrueSkill/Factors/GaussianWeightedSumFactor.php
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@ -1,10 +1,13 @@
<?php <?php
namespace Moserware\Skills\TrueSkill\Factors; namespace Moserware\Skills\TrueSkill\Factors;
require_once(dirname(__FILE__) . "/GaussianFactor.php"); require_once(dirname(__FILE__) . "/GaussianFactor.php");
require_once(dirname(__FILE__) . "/../../FactorGraphs/Message.php"); require_once(dirname(__FILE__) . "/../../FactorGraphs/Message.php");
require_once(dirname(__FILE__) . "/../../FactorGraphs/Variable.php"); require_once(dirname(__FILE__) . "/../../FactorGraphs/Variable.php");
require_once(dirname(__FILE__) . "/../../Numerics/GaussianDistribution.php"); require_once(dirname(__FILE__) . "/../../Numerics/GaussianDistribution.php");
require_once(dirname(__FILE__) . "/../../Numerics/BasicMath.php");
use Moserware\Numerics\GaussianDistribution; use Moserware\Numerics\GaussianDistribution;
use Moserware\Skills\FactorGraphs\Message; use Moserware\Skills\FactorGraphs\Message;
@ -25,7 +28,7 @@ class GaussianWeightedSumFactor extends GaussianFactor
public function __construct(Variable &$sumVariable, array &$variablesToSum, array &$variableWeights = null) public function __construct(Variable &$sumVariable, array &$variablesToSum, array &$variableWeights = null)
{ {
parent::__construct($this->createName($sumVariable, $variablesToSum, $variableWeights)); parent::__construct(self::createName($sumVariable, $variablesToSum, $variableWeights));
$this->_weights = array(); $this->_weights = array();
$this->_weightsSquared = array(); $this->_weightsSquared = array();
@ -39,7 +42,7 @@ class GaussianWeightedSumFactor extends GaussianFactor
{ {
$weight = $variableWeights[$i]; $weight = $variableWeights[$i];
$this->_weights[0][$i] = $weight; $this->_weights[0][$i] = $weight;
$this->_weightsSquared[0][i] = $weight * $weight; $this->_weightsSquared[0][$i] = $weight * $weight;
} }
$variablesToSumLength = count($variablesToSum); $variablesToSumLength = count($variablesToSum);
@ -64,14 +67,16 @@ class GaussianWeightedSumFactor extends GaussianFactor
$variableIndices[] = $weightsIndex; $variableIndices[] = $weightsIndex;
$currentWeightsSquared = array(); $currentWeightsSquared = array();
$this->_WeightsSquared[$weightsIndex] = $currentWeightsSquared; $this->_WeightsSquared[$weightsIndex] = &$currentWeightsSquared;
// keep a single variable to keep track of where we are in the array. // keep a single variable to keep track of where we are in the array.
// This is helpful since we skip over one of the spots // This is helpful since we skip over one of the spots
$currentDestinationWeightIndex = 0; $currentDestinationWeightIndex = 0;
$variableWeightsLength = count($variableWeights);
for ($currentWeightSourceIndex = 0; for ($currentWeightSourceIndex = 0;
$currentWeightSourceIndex < $variableWeights.Length; $currentWeightSourceIndex < $variableWeightsLength;
$currentWeightSourceIndex++) $currentWeightSourceIndex++)
{ {
if ($currentWeightSourceIndex == ($weightsIndex - 1)) if ($currentWeightSourceIndex == ($weightsIndex - 1))
@ -102,10 +107,10 @@ class GaussianWeightedSumFactor extends GaussianFactor
// HACK: Getting around division by zero // HACK: Getting around division by zero
$finalWeight = 0; $finalWeight = 0;
} }
$currentWeights[$currentDestinationWeightIndex] = finalWeight; $currentWeights[$currentDestinationWeightIndex] = $finalWeight;
$currentWeightsSquared[currentDestinationWeightIndex] = finalWeight*finalWeight; $currentWeightsSquared[$currentDestinationWeightIndex] = square($finalWeight);
$variableIndices[$variableIndices.Length - 1] = 0; $variableIndices[count($variableIndices) - 1] = 0;
$this->_variableIndexOrdersForWeights[] = $variableIndices; $this->_variableIndexOrdersForWeights[] = &$variableIndices;
} }
$this->createVariableToMessageBinding($sumVariable); $this->createVariableToMessageBinding($sumVariable);
@ -219,6 +224,11 @@ class GaussianWeightedSumFactor extends GaussianFactor
$updatedMessages, $updatedMessages,
$updatedVariables); $updatedVariables);
} }
private static function createName($sumVariable, $variablesToSum, $variableWeights)
{
return "TODO";
}
} }
?> ?>