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Alex Wulf
2022-07-05 16:21:06 +02:00
parent fd5d276359
commit 689e3b75fe
38 changed files with 144 additions and 355 deletions
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29
src/TrueSkill/Factors/GaussianWeightedSumFactor.php
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@@ -15,24 +15,22 @@ use DNW\Skills\Numerics\GaussianDistribution;
*/
class GaussianWeightedSumFactor extends GaussianFactor
{
private $_variableIndexOrdersForWeights = [];
private array $_variableIndexOrdersForWeights = [];
// This following is used for convenience, for example, the first entry is [0, 1, 2]
// corresponding to v[0] = a1*v[1] + a2*v[2]
private $_weights;
private array $_weights = [];
private $_weightsSquared;
private array $_weightsSquared = [];
public function __construct(Variable $sumVariable, array $variablesToSum, array $variableWeights = null)
{
parent::__construct(self::createName($sumVariable, $variablesToSum, $variableWeights));
$this->_weights = [];
$this->_weightsSquared = [];
// The first weights are a straightforward copy
// v_0 = a_1*v_1 + a_2*v_2 + ... + a_n * v_n
$variableWeightsLength = count($variableWeights);
$this->_weights[0] = array_fill(0, count($variableWeights), 0);
$variableWeightsLength = count((array) $variableWeights);
$this->_weights[0] = array_fill(0, count((array) $variableWeights), 0);
for ($i = 0; $i < $variableWeightsLength; $i++) {
$weight = &$variableWeights[$i];
@@ -48,7 +46,7 @@ class GaussianWeightedSumFactor extends GaussianFactor
$this->_variableIndexOrdersForWeights[0][] = $i;
}
$variableWeightsLength = count($variableWeights);
$variableWeightsLength = count((array) $variableWeights);
// The rest move the variables around and divide out the constant.
// For example:
@@ -71,7 +69,7 @@ class GaussianWeightedSumFactor extends GaussianFactor
for ($currentWeightSourceIndex = 0;
$currentWeightSourceIndex < $variableWeightsLength;
$currentWeightSourceIndex++) {
if ($currentWeightSourceIndex == ($weightsIndex - 1)) {
if ($currentWeightSourceIndex === $weightsIndex - 1) {
continue;
}
@@ -98,7 +96,7 @@ class GaussianWeightedSumFactor extends GaussianFactor
}
$currentWeights[$currentDestinationWeightIndex] = $finalWeight;
$currentWeightsSquared[$currentDestinationWeightIndex] = BasicMath::square($finalWeight);
$variableIndices[count($variableWeights)] = 0;
$variableIndices[count((array) $variableWeights)] = 0;
$this->_variableIndexOrdersForWeights[] = $variableIndices;
$this->_weights[$weightsIndex] = $currentWeights;
@@ -121,7 +119,7 @@ class GaussianWeightedSumFactor extends GaussianFactor
$result = 0.0;
// We start at 1 since offset 0 has the sum
$varCount = count($vars);
$varCount = is_countable($vars) ? count($vars) : 0;
for ($i = 1; $i < $varCount; $i++) {
$result += GaussianDistribution::logRatioNormalization($vars[$i]->getValue(), $messages[$i]->getValue());
}
@@ -167,7 +165,6 @@ class GaussianWeightedSumFactor extends GaussianFactor
$anotherNewPrecision = 1.0 / $anotherInverseOfNewPrecisionSum;
$newPrecisionMean = $newPrecision * $weightedMeanSum;
$anotherNewPrecisionMean = $anotherNewPrecision * $anotherWeightedMeanSum;
$newMessage = GaussianDistribution::fromPrecisionMean($newPrecisionMean, $newPrecision);
$oldMarginalWithoutMessage = GaussianDistribution::divide($marginal0, $message0);
@@ -190,7 +187,7 @@ class GaussianWeightedSumFactor extends GaussianFactor
$allMessages = $this->getMessages();
$allVariables = $this->getVariables();
Guard::argumentIsValidIndex($messageIndex, count($allMessages), 'messageIndex');
Guard::argumentIsValidIndex($messageIndex, is_countable($allMessages) ? count($allMessages) : 0, 'messageIndex');
$updatedMessages = [];
$updatedVariables = [];
@@ -200,7 +197,7 @@ class GaussianWeightedSumFactor extends GaussianFactor
// The tricky part here is that we have to put the messages and variables in the same
// order as the weights. Thankfully, the weights and messages share the same index numbers,
// so we just need to make sure they're consistent
$allMessagesCount = count($allMessages);
$allMessagesCount = is_countable($allMessages) ? count($allMessages) : 0;
for ($i = 0; $i < $allMessagesCount; $i++) {
$updatedMessages[] = $allMessages[$indicesToUse[$i]];
$updatedVariables[] = $allVariables[$indicesToUse[$i]];
@@ -218,7 +215,7 @@ class GaussianWeightedSumFactor extends GaussianFactor
$result = (string) $sumVariable;
$result .= ' = ';
$totalVars = count($variablesToSum);
$totalVars = is_countable($variablesToSum) ? count($variablesToSum) : 0;
for ($i = 0; $i < $totalVars; $i++) {
$isFirst = ($i == 0);
@@ -232,7 +229,7 @@ class GaussianWeightedSumFactor extends GaussianFactor
$result .= (string) $variablesToSum[$i];
$result .= ']';
$isLast = ($i == ($totalVars - 1));
$isLast = ($i === $totalVars - 1);
if (! $isLast) {
if ($weights[$i + 1] >= 0) {