jct/trueskill
1
0
Fork 0
mirror of https://github.com/furyfire/trueskill.git synced 2025-11-04 10:12:28 +01:00
Code Issues Packages Projects Releases Wiki Activity

General cleanup and removal of all unnecessary references

Browse Source
This commit is contained in:
Alexander Liljengård
2016-05-24 16:31:21 +02:00
parent 519ad85fad
commit a65f2aa9f3
43 changed files with 366 additions and 386 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
src/Elo/FideEloCalculator.php
View File

@@ -1,5 +1,7 @@
<?php namespace Moserware\Skills\Elo;
use Moserware\Skills\GameInfo;
/**
* Including Elo's scheme as a simple comparison.
* See http://en.wikipedia.org/wiki/Elo_rating_system#Theory
@@ -22,7 +24,7 @@ class FideEloCalculator extends TwoPlayerEloCalculator
return new FideEloCalculator(new ProvisionalFideKFactor());
}
public function getPlayerWinProbability($gameInfo, $playerRating, $opponentRating)
public function getPlayerWinProbability(GameInfo $gameInfo, $playerRating, $opponentRating)
{
$ratingDifference = $opponentRating - $playerRating;

5
src/Elo/GaussianEloCalculator.php
View File

@@ -1,7 +1,7 @@
<?php namespace Moserware\Skills\Elo;
use Moserware\Skills\GameInfo;
use Moserware\Numerics\GaussianDistribution;
use Moserware\Skills\Numerics\GaussianDistribution;
class GaussianEloCalculator extends TwoPlayerEloCalculator
{
@@ -21,6 +21,7 @@ class GaussianEloCalculator extends TwoPlayerEloCalculator
return GaussianDistribution::cumulativeTo(
$ratingDifference
/
(sqrt(2) * $gameInfo->getBeta()));
(sqrt(2) * $gameInfo->getBeta())
);
}
}

11
src/Elo/TwoPlayerEloCalculator.php
View File

@@ -6,7 +6,6 @@ use Moserware\Skills\PairwiseComparison;
use Moserware\Skills\RankSorter;
use Moserware\Skills\SkillCalculator;
use Moserware\Skills\SkillCalculatorSupportedOptions;
use Moserware\Skills\PlayersRange;
use Moserware\Skills\TeamsRange;
@@ -20,10 +19,8 @@ abstract class TwoPlayerEloCalculator extends SkillCalculator
$this->_kFactor = $kFactor;
}
public function calculateNewRatings(GameInfo $gameInfo,
array $teamsOfPlayerToRatings,
array $teamRanks)
{
public function calculateNewRatings(GameInfo $gameInfo, array $teamsOfPlayerToRatings, array $teamRanks)
{
$this->validateTeamCountAndPlayersCountPerTeam($teamsOfPlayerToRatings);
RankSorter::sort($teamsOfPlayerToRatings, $teamRanks);
@@ -71,9 +68,9 @@ abstract class TwoPlayerEloCalculator extends SkillCalculator
}
}
public abstract function getPlayerWinProbability($gameInfo, $playerRating, $opponentRating);
public abstract function getPlayerWinProbability(GameInfo $gameInfo, $playerRating, $opponentRating);
public function calculateMatchQuality(GameInfo $gameInfo, array &$teamsOfPlayerToRatings)
public function calculateMatchQuality(GameInfo $gameInfo, array $teamsOfPlayerToRatings)
{
$this->validateTeamCountAndPlayersCountPerTeam($teamsOfPlayerToRatings);
$team1 = $teamsOfPlayerToRatings[0];

5
src/FactorGraphs/DefaultVariable.php
View File

@@ -2,6 +2,7 @@
use Exception;
// XXX: This class is not used anywhere
class DefaultVariable extends Variable
{
public function __construct()
@@ -9,12 +10,12 @@ class DefaultVariable extends Variable
parent::__construct("Default", null);
}
public function &getValue()
public function getValue()
{
return null;
}
public function setValue(&$value)
public function setValue($value)
{
throw new Exception();
}

36
src/FactorGraphs/Factor.php
View File

@@ -34,24 +34,26 @@ abstract class Factor
return count($this->_messages);
}
protected function &getVariables()
protected function getVariables()
{
return $this->_variables;
}
protected function &getMessages()
protected function getMessages()
{
return $this->_messages;
}
/**
* Update the message and marginal of the i-th variable that the factor is connected to
* @param $messageIndex
* @throws Exception
*/
public function updateMessageIndex($messageIndex)
{
Guard::argumentIsValidIndex($messageIndex, count($this->_messages), "messageIndex");
$message = &$this->_messages[$messageIndex];
$variable = &$this->_messageToVariableBinding->getValue($message);
$message = $this->_messages[$messageIndex];
$variable = $this->_messageToVariableBinding->getValue($message);
return $this->updateMessageVariable($message, $variable);
}
@@ -65,41 +67,41 @@ abstract class Factor
*/
public function resetMarginals()
{
$allValues = &$this->_messageToVariableBinding->getAllValues();
foreach ($allValues as &$currentVariable) {
$allValues = $this->_messageToVariableBinding->getAllValues();
foreach ($allValues as $currentVariable) {
$currentVariable->resetToPrior();
}
}
/**
* Sends the ith message to the marginal and returns the log-normalization constant
* @param $messageIndex
* @return
* @throws Exception
*/
public function sendMessageIndex($messageIndex)
{
Guard::argumentIsValidIndex($messageIndex, count($this->_messages), "messageIndex");
$message = &$this->_messages[$messageIndex];
$variable = &$this->_messageToVariableBinding->getValue($message);
$message = $this->_messages[$messageIndex];
$variable = $this->_messageToVariableBinding->getValue($message);
return $this->sendMessageVariable($message, $variable);
}
protected abstract function sendMessageVariable(Message &$message, Variable &$variable);
protected abstract function sendMessageVariable(Message $message, Variable $variable);
public abstract function &createVariableToMessageBinding(Variable &$variable);
public abstract function createVariableToMessageBinding(Variable $variable);
protected function &createVariableToMessageBindingWithMessage(Variable &$variable, Message &$message)
protected function createVariableToMessageBindingWithMessage(Variable $variable, Message $message)
{
$index = count($this->_messages);
$localMessages = &$this->_messages;
$localMessages[] = &$message;
$this->_messageToVariableBinding->setValue($message, $variable);
$localVariables = &$this->_variables;
$localVariables[] = &$variable;
$this->_messages[] = $message;
$this->_variables[] = $variable;
return $message;
}
public function __toString()
{
return ($this->_name != null) ? $this->_name : base::__toString();
return ($this->_name != null) ? $this->_name : null;
}
}

9
src/FactorGraphs/FactorGraph.php
View File

@@ -4,14 +4,13 @@ class FactorGraph
{
private $_variableFactory;
public function &getVariableFactory()
public function getVariableFactory()
{
$factory = &$this->_variableFactory;
return $factory;
return $this->_variableFactory;
}
public function setVariableFactory(VariableFactory &$factory)
public function setVariableFactory(VariableFactory $factory)
{
$this->_variableFactory = &$factory;
$this->_variableFactory = $factory;
}
}

33
src/FactorGraphs/FactorGraphLayer.php
View File

@@ -1,5 +1,5 @@
<?php namespace Moserware\Skills\FactorGraphs;
// edit this
abstract class FactorGraphLayer
{
private $_localFactors = array();
@@ -7,38 +7,39 @@ abstract class FactorGraphLayer
private $_inputVariablesGroups = array();
private $_parentFactorGraph;
protected function __construct(FactorGraph &$parentGraph)
protected function __construct(FactorGraph $parentGraph)
{
$this->_parentFactorGraph = &$parentGraph;
$this->_parentFactorGraph = $parentGraph;
}
protected function &getInputVariablesGroups()
protected function getInputVariablesGroups()
{
$inputVariablesGroups = &$this->_inputVariablesGroups;
return $inputVariablesGroups;
return $this->_inputVariablesGroups;
}
// HACK
public function &getParentFactorGraph()
public function getParentFactorGraph()
{
$parentFactorGraph = &$this->_parentFactorGraph;
return $parentFactorGraph;
return $this->_parentFactorGraph;
}
/**
* This reference is still needed
*
* @return array
*/
public function &getOutputVariablesGroups()
{
$outputVariablesGroups = &$this->_outputVariablesGroups;
return $outputVariablesGroups;
return $this->_outputVariablesGroups;
}
public function &getLocalFactors()
public function getLocalFactors()
{
$localFactors = &$this->_localFactors;
return $localFactors;
return $this->_localFactors;
}
public function setInputVariablesGroups(&$value)
public function setInputVariablesGroups($value)
{
$this->_inputVariablesGroups = $value;
}
@@ -48,7 +49,7 @@ abstract class FactorGraphLayer
return new ScheduleSequence($name, $itemsToSequence);
}
protected function addLayerFactor(Factor &$factor)
protected function addLayerFactor(Factor $factor)
{
$this->_localFactors[] = $factor;
}

4
src/FactorGraphs/FactorList.php
View File

@@ -9,7 +9,7 @@ class FactorList
public function getLogNormalization()
{
$list = &$this->_list;
$list = $this->_list;
foreach ($list as &$currentFactor) {
$currentFactor->resetMarginals();
}
@@ -42,7 +42,7 @@ class FactorList
return count($this->_list);
}
public function &addFactor(Factor &$factor)
public function addFactor(Factor $factor)
{
$this->_list[] = $factor;
return $factor;

9
src/FactorGraphs/KeyedVariable.php
View File

@@ -4,15 +4,14 @@ class KeyedVariable extends Variable
{
private $_key;
public function __construct(&$key, $name, &$prior)
public function __construct($key, $name, $prior)
{
parent::__construct($name, $prior);
$this->_key = &$key;
$this->_key = $key;
}
public function &getKey()
public function getKey()
{
$key = &$this->_key;
return $key;
return $this->_key;
}
}

11
src/FactorGraphs/Message.php
View File

@@ -5,21 +5,20 @@ class Message
private $_name;
private $_value;
public function __construct(&$value = null, $name = null)
public function __construct($value = null, $name = null)
{
$this->_name = $name;
$this->_value = $value;
}
public function& getValue()
public function getValue()
{
$value = &$this->_value;
return $value;
return $this->_value;
}
public function setValue(&$value)
public function setValue($value)
{
$this->_value = &$value;
$this->_value = $value;
}
public function __toString()

2
src/FactorGraphs/ScheduleLoop.php
View File

@@ -5,7 +5,7 @@ class ScheduleLoop extends Schedule
private $_maxDelta;
private $_scheduleToLoop;
public function __construct($name, Schedule &$scheduleToLoop, $maxDelta)
public function __construct($name, Schedule $scheduleToLoop, $maxDelta)
{
parent::__construct($name);
$this->_scheduleToLoop = $scheduleToLoop;

4
src/FactorGraphs/ScheduleSequence.php
View File

@@ -14,8 +14,8 @@ class ScheduleSequence extends Schedule
{
$maxDelta = 0;
$schedules = &$this->_schedules;
foreach ($schedules as &$currentSchedule) {
$schedules = $this->_schedules;
foreach ($schedules as $currentSchedule) {
$currentVisit = $currentSchedule->visit($depth + 1, $maxDepth);
$maxDelta = max($currentVisit, $maxDelta);
}

4
src/FactorGraphs/ScheduleStep.php
View File

@@ -5,7 +5,7 @@ class ScheduleStep extends Schedule
private $_factor;
private $_index;
public function __construct($name, Factor &$factor, $index)
public function __construct($name, Factor $factor, $index)
{
parent::__construct($name);
$this->_factor = $factor;
@@ -14,7 +14,7 @@ class ScheduleStep extends Schedule
public function visit($depth = -1, $maxDepth = 0)
{
$currentFactor = &$this->_factor;
$currentFactor = $this->_factor;
$delta = $currentFactor->updateMessageIndex($this->_index);
return $delta;
}

11
src/FactorGraphs/Variable.php
View File

@@ -7,22 +7,21 @@ class Variable
private $_prior;
private $_value;
public function __construct($name, &$prior)
public function __construct($name, $prior)
{
$this->_name = "Variable[" . $name . "]";
$this->_prior = $prior;
$this->resetToPrior();
}
public function &getValue()
public function getValue()
{
$value = &$this->_value;
return $value;
return $this->_value;
}
public function setValue(&$value)
public function setValue($value)
{
$this->_value = &$value;
$this->_value = $value;
}
public function resetToPrior()

6
src/FactorGraphs/VariableFactory.php
View File

@@ -7,17 +7,17 @@ class VariableFactory
public function __construct($variablePriorInitializer)
{
$this->_variablePriorInitializer = &$variablePriorInitializer;
$this->_variablePriorInitializer = $variablePriorInitializer;
}
public function &createBasicVariable($name)
public function createBasicVariable($name)
{
$initializer = $this->_variablePriorInitializer;
$newVar = new Variable($name, $initializer());
return $newVar;
}
public function &createKeyedVariable(&$key, $name)
public function createKeyedVariable($key, $name)
{
$initializer = $this->_variablePriorInitializer;
$newVar = new KeyedVariable($key, $name, $initializer());

18
src/HashMap.php
View File

@@ -8,30 +8,30 @@ class HashMap
private $_hashToValue = array();
private $_hashToKey = array();
public function &getValue(&$key)
public function getValue($key)
{
$hash = self::getHash($key);
$hashValue = &$this->_hashToValue[$hash];
$hashValue = $this->_hashToValue[$hash];
return $hashValue;
}
public function setValue(&$key, &$value)
public function setValue($key, $value)
{
$hash = self::getHash($key);
$this->_hashToKey[$hash] = &$key;
$this->_hashToValue[$hash] = &$value;
$this->_hashToKey[$hash] = $key;
$this->_hashToValue[$hash] = $value;
return $this;
}
public function &getAllKeys()
public function getAllKeys()
{
$keys = &array_values($this->_hashToKey);
$keys = array_values($this->_hashToKey);
return $keys;
}
public function getAllValues()
{
$values = &array_values($this->_hashToValue);
$values = array_values($this->_hashToValue);
return $values;
}
@@ -40,7 +40,7 @@ class HashMap
return count($this->_hashToKey);
}
private static function getHash(&$key)
private static function getHash($key)
{
if (is_object($key)) {
return spl_object_hash($key);

9
src/Numerics/GaussianDistribution.php
View File

@@ -109,7 +109,8 @@ class GaussianDistribution
{
return max(
abs($left->_precisionMean - $right->_precisionMean),
sqrt(abs($left->_precision - $right->_precision)));
sqrt(abs($left->_precision - $right->_precision))
);
}
// Computes the absolute difference between two Gaussians
@@ -133,8 +134,10 @@ class GaussianDistribution
public static function divide(GaussianDistribution $numerator, GaussianDistribution $denominator)
{
return GaussianDistribution::fromPrecisionMean($numerator->_precisionMean - $denominator->_precisionMean,
$numerator->_precision - $denominator->_precision);
return GaussianDistribution::fromPrecisionMean(
$numerator->_precisionMean - $denominator->_precisionMean,
$numerator->_precision - $denominator->_precision
);
}
public static function logRatioNormalization(GaussianDistribution $numerator, GaussianDistribution $denominator)

140
src/Numerics/Matrix.php
View File

@@ -1,5 +1,7 @@
<?php namespace Moserware\Skills\Numerics;
use Exception;
class Matrix
{
const ERROR_TOLERANCE = 0.0000000001;
@@ -20,12 +22,10 @@ class Matrix
$data = array();
$result = new Matrix($rows, $columns, $data);
for($currentColumn = 0; $currentColumn < $columns; $currentColumn++)
{
for ($currentColumn = 0; $currentColumn < $columns; $currentColumn++) {
$currentColumnData = $columnValues[$currentColumn];
for($currentRow = 0; $currentRow < $rows; $currentRow++)
{
for ($currentRow = 0; $currentRow < $rows; $currentRow++) {
$result->setValue($currentRow, $currentColumn, $currentColumnData[$currentRow]);
}
}
@@ -41,10 +41,8 @@ class Matrix
$result = new Matrix($rows, $cols);
$currentIndex = 2;
for($currentRow = 0; $currentRow < $rows; $currentRow++)
{
for($currentCol = 0; $currentCol < $cols; $currentCol++)
{
for ($currentRow = 0; $currentRow < $rows; $currentRow++) {
for ($currentCol = 0; $currentCol < $cols; $currentCol++) {
$result->setValue($currentRow, $currentCol, $args[$currentIndex++]);
}
}
@@ -80,12 +78,10 @@ class Matrix
$rowMatrixData = $this->_matrixRowData;
for ($currentRowTransposeMatrix = 0;
$currentRowTransposeMatrix < $this->_columnCount;
$currentRowTransposeMatrix++)
{
$currentRowTransposeMatrix++) {
for ($currentColumnTransposeMatrix = 0;
$currentColumnTransposeMatrix < $this->_rowCount;
$currentColumnTransposeMatrix++)
{
$currentColumnTransposeMatrix++) {
$transposeMatrix[$currentRowTransposeMatrix][$currentColumnTransposeMatrix] =
$rowMatrixData[$currentColumnTransposeMatrix][$currentRowTransposeMatrix];
}
@@ -102,19 +98,16 @@ class Matrix
public function getDeterminant()
{
// Basic argument checking
if (!$this->isSquare())
{
if (!$this->isSquare()) {
throw new Exception("Matrix must be square!");
}
if ($this->_rowCount == 1)
{
if ($this->_rowCount == 1) {
// Really happy path :)
return $this->_matrixRowData[0][0];
}
if ($this->_rowCount == 2)
{
if ($this->_rowCount == 2) {
// Happy path!
// Given:
// | a b |
@@ -124,7 +117,7 @@ class Matrix
$b = $this->_matrixRowData[0][1];
$c = $this->_matrixRowData[1][0];
$d = $this->_matrixRowData[1][1];
return $a*$d - $b*$c;
return $a * $d - $b * $c;
}
// I use the Laplace expansion here since it's straightforward to implement.
@@ -136,11 +129,10 @@ class Matrix
$result = 0.0;
// I expand along the first row
for ($currentColumn = 0; $currentColumn < $this->_columnCount; $currentColumn++)
{
for ($currentColumn = 0; $currentColumn < $this->_columnCount; $currentColumn++) {
$firstRowColValue = $this->_matrixRowData[0][$currentColumn];
$cofactor = $this->getCofactor(0, $currentColumn);
$itemToAdd = $firstRowColValue*$cofactor;
$itemToAdd = $firstRowColValue * $cofactor;
$result = $result + $itemToAdd;
}
@@ -149,14 +141,12 @@ class Matrix
public function getAdjugate()
{
if (!$this->isSquare())
{
if (!$this->isSquare()) {
throw new Exception("Matrix must be square!");
}
// See http://en.wikipedia.org/wiki/Adjugate_matrix
if ($this->_rowCount == 2)
{
if ($this->_rowCount == 2) {
// Happy path!
// Adjugate of:
// | a b |
@@ -170,17 +160,15 @@ class Matrix
$c = $this->_matrixRowData[1][0];
$d = $this->_matrixRowData[1][1];
return new SquareMatrix( $d, -$b,
-$c, $a);
return new SquareMatrix($d, -$b,
-$c, $a);
}
// The idea is that it's the transpose of the cofactors
$result = array();
for ($currentColumn = 0; $currentColumn < $this->_columnCount; $currentColumn++)
{
for ($currentRow = 0; $currentRow < $this->_rowCount; $currentRow++)
{
for ($currentColumn = 0; $currentColumn < $this->_columnCount; $currentColumn++) {
for ($currentRow = 0; $currentRow < $this->_rowCount; $currentRow++) {
$result[$currentColumn][$currentRow] = $this->getCofactor($currentRow, $currentColumn);
}
}
@@ -190,9 +178,8 @@ class Matrix
public function getInverse()
{
if (($this->_rowCount == 1) && ($this->_columnCount == 1))
{
return new SquareMatrix(1.0/$this->_matrixRowData[0][0]);
if (($this->_rowCount == 1) && ($this->_columnCount == 1)) {
return new SquareMatrix(1.0 / $this->_matrixRowData[0][0]);
}
// Take the simple approach:
@@ -209,11 +196,9 @@ class Matrix
$columns = $matrix->getColumnCount();
$newValues = array();
for ($currentRow = 0; $currentRow < $rows; $currentRow++)
{
for ($currentColumn = 0; $currentColumn < $columns; $currentColumn++)
{
$newValues[$currentRow][$currentColumn] = $scalarValue*$matrix->getValue($currentRow, $currentColumn);
for ($currentRow = 0; $currentRow < $rows; $currentRow++) {
for ($currentColumn = 0; $currentColumn < $columns; $currentColumn++) {
$newValues[$currentRow][$currentColumn] = $scalarValue * $matrix->getValue($currentRow, $currentColumn);
}
}
@@ -223,11 +208,10 @@ class Matrix
public static function add($left, $right)
{
if (
($left->getRowCount() != $right->getRowCount())
||
($left->getColumnCount() != $right->getColumnCount())
)
{
($left->getRowCount() != $right->getRowCount())
||
($left->getColumnCount() != $right->getColumnCount())
) {
throw new Exception("Matrices must be of the same size");
}
@@ -235,14 +219,12 @@ class Matrix
$resultMatrix = array();
for ($currentRow = 0; $currentRow < $left->getRowCount(); $currentRow++)
{
for ($currentColumn = 0; $currentColumn < $right->getColumnCount(); $currentColumn++)
{
for ($currentRow = 0; $currentRow < $left->getRowCount(); $currentRow++) {
for ($currentColumn = 0; $currentColumn < $right->getColumnCount(); $currentColumn++) {
$resultMatrix[$currentRow][$currentColumn] =
$left->getValue($currentRow, $currentColumn)
+
$right->getValue($currentRow, $currentColumn);
$left->getValue($currentRow, $currentColumn)
+
$right->getValue($currentRow, $currentColumn);
}
}
@@ -254,8 +236,7 @@ class Matrix
// Just your standard matrix multiplication.
// See http://en.wikipedia.org/wiki/Matrix_multiplication for details
if ($left->getColumnCount() != $right->getRowCount())
{
if ($left->getColumnCount() != $right->getRowCount()) {
throw new Exception("The width of the left matrix must match the height of the right matrix");
}
@@ -264,17 +245,14 @@ class Matrix
$resultMatrix = array();
for ($currentRow = 0; $currentRow < $resultRows; $currentRow++)
{
for ($currentColumn = 0; $currentColumn < $resultColumns; $currentColumn++)
{
for ($currentRow = 0; $currentRow < $resultRows; $currentRow++) {
for ($currentColumn = 0; $currentColumn < $resultColumns; $currentColumn++) {
$productValue = 0;
for ($vectorIndex = 0; $vectorIndex < $left->getColumnCount(); $vectorIndex++)
{
for ($vectorIndex = 0; $vectorIndex < $left->getColumnCount(); $vectorIndex++) {
$leftValue = $left->getValue($currentRow, $vectorIndex);
$rightValue = $right->getValue($vectorIndex, $currentColumn);
$vectorIndexProduct = $leftValue*$rightValue;
$vectorIndexProduct = $leftValue * $rightValue;
$productValue = $productValue + $vectorIndexProduct;
}
@@ -283,7 +261,7 @@ class Matrix
}
return new Matrix($resultRows, $resultColumns, $resultMatrix);
}
}
private function getMinorMatrix($rowToRemove, $columnToRemove)
{
@@ -294,19 +272,15 @@ class Matrix
$actualRow = 0;
for ($currentRow = 0; $currentRow < $this->_rowCount; $currentRow++)
{
if ($currentRow == $rowToRemove)
{
for ($currentRow = 0; $currentRow < $this->_rowCount; $currentRow++) {
if ($currentRow == $rowToRemove) {
continue;
}
$actualCol = 0;
for ($currentColumn = 0; $currentColumn < $this->_columnCount; $currentColumn++)
{
if ($currentColumn == $columnToRemove)
{
for ($currentColumn = 0; $currentColumn < $this->_columnCount; $currentColumn++) {
if ($currentColumn == $columnToRemove) {
continue;
}
@@ -326,41 +300,33 @@ class Matrix
// See http://en.wikipedia.org/wiki/Cofactor_(linear_algebra) for details
// REVIEW: should things be reversed since I'm 0 indexed?
$sum = $rowToRemove + $columnToRemove;
$isEven = ($sum%2 == 0);
$isEven = ($sum % 2 == 0);
if ($isEven)
{
if ($isEven) {
return $this->getMinorMatrix($rowToRemove, $columnToRemove)->getDeterminant();
}
else
{
return -1.0*$this->getMinorMatrix($rowToRemove, $columnToRemove)->getDeterminant();
} else {
return -1.0 * $this->getMinorMatrix($rowToRemove, $columnToRemove)->getDeterminant();
}
}
public function equals($otherMatrix)
{
// If one is null, but not both, return false.
if ($otherMatrix == null)
{
if ($otherMatrix == null) {
return false;
}
if (($this->_rowCount != $otherMatrix->getRowCount()) || ($this->_columnCount != $otherMatrix->getColumnCount()))
{
if (($this->_rowCount != $otherMatrix->getRowCount()) || ($this->_columnCount != $otherMatrix->getColumnCount())) {
return false;
}
for ($currentRow = 0; $currentRow < $this->_rowCount; $currentRow++)
{
for ($currentColumn = 0; $currentColumn < $this->_columnCount; $currentColumn++)
{
for ($currentRow = 0; $currentRow < $this->_rowCount; $currentRow++) {
for ($currentColumn = 0; $currentColumn < $this->_columnCount; $currentColumn++) {
$delta =
abs($this->_matrixRowData[$currentRow][$currentColumn] -
$otherMatrix->getValue($currentRow, $currentColumn));
if ($delta > self::ERROR_TOLERANCE)
{
if ($delta > self::ERROR_TOLERANCE) {
return false;
}
}

3
src/Numerics/Vector.php
View File

@@ -5,8 +5,7 @@ class Vector extends Matrix
public function __construct(array $vectorValues)
{
$columnValues = array();
foreach($vectorValues as $currentVectorValue)
{
foreach ($vectorValues as $currentVectorValue) {
$columnValues[] = array($currentVectorValue);
}
parent::__construct(count($vectorValues), 1, $columnValues);

3
src/Player.php
View File

@@ -34,9 +34,8 @@ class Player implements ISupportPartialPlay, ISupportPartialUpdate
/**
* The identifier for the player, such as a name.
*/
public function &getId()
public function getId()
{
$id = &$this->_Id;
return $this->_Id;
}

17
src/RatingContainer.php
View File

@@ -9,27 +9,24 @@ class RatingContainer
$this->_playerToRating = new HashMap();
}
public function &getRating(Player &$player)
public function getRating(Player $player)
{
$rating = &$this->_playerToRating->getValue($player);
return $rating;
return $this->_playerToRating->getValue($player);
}
public function setRating(Player &$player, Rating $rating)
public function setRating(Player $player, Rating $rating)
{
return $this->_playerToRating->setValue($player, $rating);
}
public function &getAllPlayers()
public function getAllPlayers()
{
$allPlayers = &$this->_playerToRating->getAllKeys();
return $allPlayers;
return $this->_playerToRating->getAllKeys();
}
public function &getAllRatings()
public function getAllRatings()
{
$allRatings = &$this->_playerToRating->getAllValues();
return $allRatings;
return $this->_playerToRating->getAllValues();
}
public function count()

12
src/SkillCalculator.php
View File

@@ -37,23 +37,21 @@ abstract class SkillCalculator
* @param array $teamsOfPlayerToRatings A mapping of team players and their ratings.
* @return The quality of the match between the teams as a percentage (0% = bad, 100% = well matched).
*/
public abstract function calculateMatchQuality(GameInfo $gameInfo,
array &$teamsOfPlayerToRatings);
public abstract function calculateMatchQuality(GameInfo $gameInfo, array $teamsOfPlayerToRatings);
public function isSupported($option)
{
return ($this->_supportedOptions & $option) == $option;
}
protected function validateTeamCountAndPlayersCountPerTeam(array &$teamsOfPlayerToRatings)
protected function validateTeamCountAndPlayersCountPerTeam(array $teamsOfPlayerToRatings)
{
self::validateTeamCountAndPlayersCountPerTeamWithRanges($teamsOfPlayerToRatings, $this->_totalTeamsAllowed, $this->_playersPerTeamAllowed);
}
private static function validateTeamCountAndPlayersCountPerTeamWithRanges(
array &$teams,
TeamsRange &$totalTeams,
PlayersRange &$playersPerTeam)
private static function validateTeamCountAndPlayersCountPerTeamWithRanges(array $teams,
TeamsRange $totalTeams,
PlayersRange $playersPerTeam)
{
$countOfTeams = 0;

4
src/Team.php
View File

@@ -2,7 +2,7 @@
class Team extends RatingContainer
{
public function __construct(Player &$player = null, Rating $rating = null)
public function __construct(Player $player = null, Rating $rating = null)
{
parent::__construct();
@@ -12,7 +12,7 @@ class Team extends RatingContainer
}
}
public function addPlayer(Player &$player, Rating $rating)
public function addPlayer(Player $player, Rating $rating)
{
$this->setRating($player, $rating);
return $this;

4
src/Teams.php
View File

@@ -7,8 +7,8 @@ class Teams
$args = func_get_args();
$result = array();
foreach ($args as &$currentTeam) {
$localCurrentTeam = &$currentTeam;
foreach ($args as $currentTeam) {
$localCurrentTeam = $currentTeam;
$result[] = $localCurrentTeam;
}

12
src/TrueSkill/FactorGraphTrueSkillCalculator.php
View File

@@ -43,8 +43,7 @@ class FactorGraphTrueSkillCalculator extends SkillCalculator
return $factorGraph->getUpdatedRatings();
}
public function calculateMatchQuality(GameInfo $gameInfo,
array &$teams)
public function calculateMatchQuality(GameInfo $gameInfo, array $teams)
{
// We need to create the A matrix which is the player team assigments.
$teamAssignmentsList = $teams;
@@ -87,7 +86,7 @@ class FactorGraphTrueSkillCalculator extends SkillCalculator
return $result;
}
private static function getPlayerMeansVector(array &$teamAssignmentsList)
private static function getPlayerMeansVector(array $teamAssignmentsList)
{
// A simple vector of all the player means.
return new Vector(self::getPlayerRatingValues($teamAssignmentsList,
@@ -96,7 +95,7 @@ class FactorGraphTrueSkillCalculator extends SkillCalculator
}));
}
private static function getPlayerCovarianceMatrix(array &$teamAssignmentsList)
private static function getPlayerCovarianceMatrix(array $teamAssignmentsList)
{
// This is a square matrix whose diagonal values represent the variance (square of standard deviation) of all
// players.
@@ -108,8 +107,7 @@ class FactorGraphTrueSkillCalculator extends SkillCalculator
}
// Helper function that gets a list of values for all player ratings
private static function getPlayerRatingValues(array &$teamAssignmentsList,
$playerRatingFunction)
private static function getPlayerRatingValues(array $teamAssignmentsList, $playerRatingFunction)
{
$playerRatingValues = array();
@@ -122,7 +120,7 @@ class FactorGraphTrueSkillCalculator extends SkillCalculator
return $playerRatingValues;
}
private static function createPlayerTeamAssignmentMatrix(&$teamAssignmentsList, $totalPlayers)
private static function createPlayerTeamAssignmentMatrix($teamAssignmentsList, $totalPlayers)
{
// The team assignment matrix is often referred to as the "A" matrix. It's a matrix whose rows represent the players
// and the columns represent teams. At Matrix[row, column] represents that player[row] is on team[col]

10
src/TrueSkill/Factors/GaussianFactor.php
View File

@@ -18,19 +18,19 @@ abstract class GaussianFactor extends Factor
* @param Variable $variable
* @return float|int
*/
protected function sendMessageVariable(Message &$message, Variable &$variable)
protected function sendMessageVariable(Message $message, Variable $variable)
{
$marginal = &$variable->getValue();
$messageValue = &$message->getValue();
$marginal = $variable->getValue();
$messageValue = $message->getValue();
$logZ = GaussianDistribution::logProductNormalization($marginal, $messageValue);
$variable->setValue(GaussianDistribution::multiply($marginal, $messageValue));
return $logZ;
}
public function &createVariableToMessageBinding(Variable &$variable)
public function createVariableToMessageBinding(Variable $variable)
{
$newDistribution = GaussianDistribution::fromPrecisionMean(0, 0);
$binding = &parent::createVariableToMessageBindingWithMessage($variable,
$binding = parent::createVariableToMessageBindingWithMessage($variable,
new Message(
$newDistribution,
sprintf("message from %s to %s", $this, $variable)));

32
src/TrueSkill/Factors/GaussianGreaterThanFactor.php
View File

@@ -14,7 +14,7 @@ class GaussianGreaterThanFactor extends GaussianFactor
{
private $_epsilon;
public function __construct($epsilon, Variable &$variable)
public function __construct($epsilon, Variable $variable)
{
parent::__construct(\sprintf("%s > %.2f", $variable, $epsilon));
$this->_epsilon = $epsilon;
@@ -23,20 +23,26 @@ class GaussianGreaterThanFactor extends GaussianFactor
public function getLogNormalization()
{
$vars = &$this->getVariables();
$marginal = &$vars[0]->getValue();
$messages = &$this->getMessages();
$message = &$messages[0]->getValue();
/** @var Variable[] $vars */
$vars = $this->getVariables();
$marginal = $vars[0]->getValue();
/** @var Message[] $messages */
$messages = $this->getMessages();
$message = $messages[0]->getValue();
$messageFromVariable = GaussianDistribution::divide($marginal, $message);
return -GaussianDistribution::logProductNormalization($messageFromVariable, $message)
+
log(
GaussianDistribution::cumulativeTo(($messageFromVariable->getMean() - $this->_epsilon) /
$messageFromVariable->getStandardDeviation()));
GaussianDistribution::cumulativeTo(
($messageFromVariable->getMean() - $this->_epsilon) /
$messageFromVariable->getStandardDeviation()
)
);
}
protected function updateMessageVariable(Message &$message, Variable &$variable)
protected function updateMessageVariable(Message $message, Variable $variable)
{
$oldMarginal = clone $variable->getValue();
$oldMessage = clone $message->getValue();
@@ -55,16 +61,18 @@ class GaussianGreaterThanFactor extends GaussianFactor
$denom = 1.0 - TruncatedGaussianCorrectionFunctions::wExceedsMargin($dOnSqrtC, $epsilsonTimesSqrtC);
$newPrecision = $c / $denom;
$newPrecisionMean = ($d +
$newPrecisionMean = (
$d +
$sqrtC *
TruncatedGaussianCorrectionFunctions::vExceedsMargin($dOnSqrtC, $epsilsonTimesSqrtC)) /
$denom;
TruncatedGaussianCorrectionFunctions::vExceedsMargin($dOnSqrtC, $epsilsonTimesSqrtC)
) / $denom;
$newMarginal = GaussianDistribution::fromPrecisionMean($newPrecisionMean, $newPrecision);
$newMessage = GaussianDistribution::divide(
GaussianDistribution::multiply($oldMessage, $newMarginal),
$oldMarginal);
$oldMarginal
);
// Update the message and marginal
$message->setValue($newMessage);

22
src/TrueSkill/Factors/GaussianLikelihoodFactor.php
View File

@@ -1,6 +1,7 @@
<?php namespace Moserware\Skills\TrueSkill\Factors;
use Exception;
use Moserware\Skills\FactorGraphs\KeyedVariable;
use Moserware\Skills\FactorGraphs\Message;
use Moserware\Skills\FactorGraphs\Variable;
use Moserware\Skills\Numerics\GaussianDistribution;
@@ -14,7 +15,7 @@ class GaussianLikelihoodFactor extends GaussianFactor
{
private $_precision;
public function __construct($betaSquared, Variable &$variable1, Variable &$variable2)
public function __construct($betaSquared, Variable $variable1, Variable $variable2)
{
parent::__construct(sprintf("Likelihood of %s going to %s", $variable2, $variable1));
$this->_precision = 1.0 / $betaSquared;
@@ -24,16 +25,18 @@ class GaussianLikelihoodFactor extends GaussianFactor
public function getLogNormalization()
{
$vars = &$this->getVariables();
$messages = &$this->getMessages();
/** @var KeyedVariable[]|mixed $vars */
$vars = $this->getVariables();
/** @var Message[] $messages */
$messages = $this->getMessages();
return GaussianDistribution::logRatioNormalization(
$vars[0]->getValue(),
$messages[0]->getValue());
$messages[0]->getValue()
);
}
private function updateHelper(Message &$message1, Message &$message2,
Variable &$variable1, Variable &$variable2)
private function updateHelper(Message $message1, Message $message2, Variable $variable1, Variable $variable2)
{
$message1Value = clone $message1->getValue();
$message2Value = clone $message2->getValue();
@@ -45,7 +48,8 @@ class GaussianLikelihoodFactor extends GaussianFactor
$newMessage = GaussianDistribution::fromPrecisionMean(
$a * ($marginal2->getPrecisionMean() - $message2Value->getPrecisionMean()),
$a * ($marginal2->getPrecision() - $message2Value->getPrecision()));
$a * ($marginal2->getPrecision() - $message2Value->getPrecision())
);
$oldMarginalWithoutMessage = GaussianDistribution::divide($marginal1, $message1Value);
@@ -62,8 +66,8 @@ class GaussianLikelihoodFactor extends GaussianFactor
public function updateMessageIndex($messageIndex)
{
$messages = &$this->getMessages();
$vars = &$this->getVariables();
$messages = $this->getMessages();
$vars = $this->getVariables();
switch ($messageIndex) {
case 0:

15
src/TrueSkill/Factors/GaussianPriorFactor.php
View File

@@ -13,7 +13,7 @@ class GaussianPriorFactor extends GaussianFactor
{
private $_newMessage;
public function __construct($mean, $variance, Variable &$variable)
public function __construct($mean, $variance, Variable $variable)
{
parent::__construct(sprintf("Prior value going to %s", $variable));
$this->_newMessage = new GaussianDistribution($mean, sqrt($variance));
@@ -23,18 +23,17 @@ class GaussianPriorFactor extends GaussianFactor
$this->createVariableToMessageBindingWithMessage($variable, $newMessage);
}
protected function updateMessageVariable(Message &$message, Variable &$variable)
protected function updateMessageVariable(Message $message, Variable $variable)
{
$oldMarginal = clone $variable->getValue();
$oldMessage = $message;
$newMarginal =
GaussianDistribution::fromPrecisionMean(
$oldMarginal->getPrecisionMean() + $this->_newMessage->getPrecisionMean() - $oldMessage->getValue()->getPrecisionMean(),
$oldMarginal->getPrecision() + $this->_newMessage->getPrecision() - $oldMessage->getValue()->getPrecision());
$newMarginal = GaussianDistribution::fromPrecisionMean(
$oldMarginal->getPrecisionMean() + $this->_newMessage->getPrecisionMean() - $oldMessage->getValue()->getPrecisionMean(),
$oldMarginal->getPrecision() + $this->_newMessage->getPrecision() - $oldMessage->getValue()->getPrecision()
);
$variable->setValue($newMarginal);
$newMessage = &$this->_newMessage;
$message->setValue($newMessage);
$message->setValue($this->_newMessage);
return GaussianDistribution::subtract($oldMarginal, $newMarginal);
}
}

26
src/TrueSkill/Factors/GaussianWeightedSumFactor.php
View File

@@ -20,7 +20,7 @@ class GaussianWeightedSumFactor extends GaussianFactor
private $_weights;
private $_weightsSquared;
public function __construct(Variable &$sumVariable, array &$variablesToSum, array &$variableWeights = null)
public function __construct(Variable $sumVariable, array $variablesToSum, array $variableWeights = null)
{
parent::__construct(self::createName($sumVariable, $variablesToSum, $variableWeights));
$this->_weights = array();
@@ -29,7 +29,7 @@ class GaussianWeightedSumFactor extends GaussianFactor
// 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);
$this->_weights[0] = array_fill(0, count($variableWeights), 0);
for ($i = 0; $i < $variableWeightsLength; $i++) {
$weight = &$variableWeights[$i];
@@ -104,16 +104,16 @@ class GaussianWeightedSumFactor extends GaussianFactor
$this->createVariableToMessageBinding($sumVariable);
foreach ($variablesToSum as &$currentVariable) {
$localCurrentVariable = &$currentVariable;
foreach ($variablesToSum as $currentVariable) {
$localCurrentVariable = $currentVariable;
$this->createVariableToMessageBinding($localCurrentVariable);
}
}
public function getLogNormalization()
{
$vars = &$this->getVariables();
$messages = &$this->getMessages();
$vars = $this->getVariables();
$messages = $this->getMessages();
$result = 0.0;
@@ -126,9 +126,7 @@ class GaussianWeightedSumFactor extends GaussianFactor
return $result;
}
private function updateHelper(array &$weights, array &$weightsSquared,
array &$messages,
array &$variables)
private function updateHelper(array $weights, array $weightsSquared, array $messages, array $variables)
{
// Potentially look at http://mathworld.wolfram.com/NormalSumDistribution.html for clues as
// to what it's doing
@@ -185,23 +183,23 @@ class GaussianWeightedSumFactor extends GaussianFactor
public function updateMessageIndex($messageIndex)
{
$allMessages = &$this->getMessages();
$allVariables = &$this->getVariables();
$allMessages = $this->getMessages();
$allVariables = $this->getVariables();
Guard::argumentIsValidIndex($messageIndex, count($allMessages), "messageIndex");
$updatedMessages = array();
$updatedVariables = array();
$indicesToUse = &$this->_variableIndexOrdersForWeights[$messageIndex];
$indicesToUse = $this->_variableIndexOrdersForWeights[$messageIndex];
// 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);
for ($i = 0; $i < $allMessagesCount; $i++) {
$updatedMessages[] = &$allMessages[$indicesToUse[$i]];
$updatedVariables[] = &$allVariables[$indicesToUse[$i]];
$updatedMessages[] = $allMessages[$indicesToUse[$i]];
$updatedVariables[] = $allVariables[$indicesToUse[$i]];
}
return $this->updateHelper($this->_weights[$messageIndex],

25
src/TrueSkill/Factors/GaussianWithinFactor.php
View File

@@ -14,7 +14,7 @@ class GaussianWithinFactor extends GaussianFactor
{
private $_epsilon;
public function __construct($epsilon, Variable &$variable)
public function __construct($epsilon, Variable $variable)
{
parent::__construct(sprintf("%s <= %.2f", $variable, $epsilon));
$this->_epsilon = $epsilon;
@@ -23,11 +23,13 @@ class GaussianWithinFactor extends GaussianFactor
public function getLogNormalization()
{
$variables = &$this->getVariables();
$marginal = &$variables[0]->getValue();
/** @var Variable[] $variables */
$variables = $this->getVariables();
$marginal = $variables[0]->getValue();
$messages = &$this->getMessages();
$message = &$messages[0]->getValue();
/** @var Message[] $messages */
$messages = $this->getMessages();
$message = $messages[0]->getValue();
$messageFromVariable = GaussianDistribution::divide($marginal, $message);
$mean = $messageFromVariable->getMean();
$std = $messageFromVariable->getStandardDeviation();
@@ -38,7 +40,7 @@ class GaussianWithinFactor extends GaussianFactor
return -GaussianDistribution::logProductNormalization($messageFromVariable, $message) + log($z);
}
protected function updateMessageVariable(Message &$message, Variable &$variable)
protected function updateMessageVariable(Message $message, Variable $variable)
{
$oldMarginal = clone $variable->getValue();
$oldMessage = clone $message->getValue();
@@ -55,15 +57,16 @@ class GaussianWithinFactor extends GaussianFactor
$denominator = 1.0 - TruncatedGaussianCorrectionFunctions::wWithinMargin($dOnSqrtC, $epsilonTimesSqrtC);
$newPrecision = $c / $denominator;
$newPrecisionMean = ($d +
$sqrtC *
TruncatedGaussianCorrectionFunctions::vWithinMargin($dOnSqrtC, $epsilonTimesSqrtC)) /
$denominator;
$newPrecisionMean = ( $d +
$sqrtC *
TruncatedGaussianCorrectionFunctions::vWithinMargin($dOnSqrtC, $epsilonTimesSqrtC)
) / $denominator;
$newMarginal = GaussianDistribution::fromPrecisionMean($newPrecisionMean, $newPrecision);
$newMessage = GaussianDistribution::divide(
GaussianDistribution::multiply($oldMessage, $newMarginal),
$oldMarginal);
$oldMarginal
);
// Update the message and marginal
$message->setValue($newMessage);

55
src/TrueSkill/Layers/IteratedTeamDifferencesInnerLayer.php
View File

@@ -1,5 +1,6 @@
<?php namespace Moserware\Skills\TrueSkill\Layers;
use Exception;
use Moserware\Skills\FactorGraphs\ScheduleLoop;
use Moserware\Skills\FactorGraphs\ScheduleSequence;
use Moserware\Skills\FactorGraphs\ScheduleStep;
@@ -11,30 +12,31 @@ class IteratedTeamDifferencesInnerLayer extends TrueSkillFactorGraphLayer
private $_TeamDifferencesComparisonLayer;
private $_TeamPerformancesToTeamPerformanceDifferencesLayer;
public function __construct(TrueSkillFactorGraph &$parentGraph,
TeamPerformancesToTeamPerformanceDifferencesLayer &$teamPerformancesToPerformanceDifferences,
TeamDifferencesComparisonLayer &$teamDifferencesComparisonLayer)
public function __construct(TrueSkillFactorGraph $parentGraph,
TeamPerformancesToTeamPerformanceDifferencesLayer $teamPerformancesToPerformanceDifferences,
TeamDifferencesComparisonLayer $teamDifferencesComparisonLayer)
{
parent::__construct($parentGraph);
$this->_TeamPerformancesToTeamPerformanceDifferencesLayer = $teamPerformancesToPerformanceDifferences;
$this->_TeamDifferencesComparisonLayer = $teamDifferencesComparisonLayer;
}
public function &getLocalFactors()
public function getLocalFactors()
{
$localFactors =
array_merge($this->_TeamPerformancesToTeamPerformanceDifferencesLayer->getLocalFactors(),
$this->_TeamDifferencesComparisonLayer->getLocalFactors());
$localFactors = array_merge($this->_TeamPerformancesToTeamPerformanceDifferencesLayer->getLocalFactors(),
$this->_TeamDifferencesComparisonLayer->getLocalFactors()
);
return $localFactors;
}
public function buildLayer()
{
$inputVariablesGroups = &$this->getInputVariablesGroups();
$inputVariablesGroups = $this->getInputVariablesGroups();
$this->_TeamPerformancesToTeamPerformanceDifferencesLayer->setInputVariablesGroups($inputVariablesGroups);
$this->_TeamPerformancesToTeamPerformanceDifferencesLayer->buildLayer();
$teamDifferencesOutputVariablesGroups = &$this->_TeamPerformancesToTeamPerformanceDifferencesLayer->getOutputVariablesGroups();
$teamDifferencesOutputVariablesGroups = $this->_TeamPerformancesToTeamPerformanceDifferencesLayer->getOutputVariablesGroups();
$this->_TeamDifferencesComparisonLayer->setInputVariablesGroups($teamDifferencesOutputVariablesGroups);
$this->_TeamDifferencesComparisonLayer->buildLayer();
}
@@ -44,7 +46,7 @@ class IteratedTeamDifferencesInnerLayer extends TrueSkillFactorGraphLayer
switch (count($this->getInputVariablesGroups())) {
case 0:
case 1:
throw new InvalidOperationException();
throw new Exception('InvalidOperation');
case 2:
$loop = $this->createTwoTeamInnerPriorLoopSchedule();
break;
@@ -57,10 +59,11 @@ class IteratedTeamDifferencesInnerLayer extends TrueSkillFactorGraphLayer
$totalTeamDifferences = count($this->_TeamPerformancesToTeamPerformanceDifferencesLayer->getLocalFactors());
$totalTeams = $totalTeamDifferences + 1;
$localFactors = &$this->_TeamPerformancesToTeamPerformanceDifferencesLayer->getLocalFactors();
$localFactors = $this->_TeamPerformancesToTeamPerformanceDifferencesLayer->getLocalFactors();
$firstDifferencesFactor = $localFactors[0];
$lastDifferencesFactor = $localFactors[$totalTeamDifferences - 1];
$firstDifferencesFactor = &$localFactors[0];
$lastDifferencesFactor = &$localFactors[$totalTeamDifferences - 1];
$innerSchedule = new ScheduleSequence(
"inner schedule",
array(
@@ -79,11 +82,11 @@ class IteratedTeamDifferencesInnerLayer extends TrueSkillFactorGraphLayer
private function createTwoTeamInnerPriorLoopSchedule()
{
$teamPerformancesToTeamPerformanceDifferencesLayerLocalFactors = &$this->_TeamPerformancesToTeamPerformanceDifferencesLayer->getLocalFactors();
$teamDifferencesComparisonLayerLocalFactors = &$this->_TeamDifferencesComparisonLayer->getLocalFactors();
$teamPerformancesToTeamPerformanceDifferencesLayerLocalFactors = $this->_TeamPerformancesToTeamPerformanceDifferencesLayer->getLocalFactors();
$teamDifferencesComparisonLayerLocalFactors = $this->_TeamDifferencesComparisonLayer->getLocalFactors();
$firstPerfToTeamDiff = &$teamPerformancesToTeamPerformanceDifferencesLayerLocalFactors[0];
$firstTeamDiffComparison = &$teamDifferencesComparisonLayerLocalFactors[0];
$firstPerfToTeamDiff = $teamPerformancesToTeamPerformanceDifferencesLayerLocalFactors[0];
$firstTeamDiffComparison = $teamDifferencesComparisonLayerLocalFactors[0];
$itemsToSequence = array(
new ScheduleStep(
"send team perf to perf differences",
@@ -107,11 +110,11 @@ class IteratedTeamDifferencesInnerLayer extends TrueSkillFactorGraphLayer
$forwardScheduleList = array();
for ($i = 0; $i < $totalTeamDifferences - 1; $i++) {
$teamPerformancesToTeamPerformanceDifferencesLayerLocalFactors = &$this->_TeamPerformancesToTeamPerformanceDifferencesLayer->getLocalFactors();
$teamDifferencesComparisonLayerLocalFactors = &$this->_TeamDifferencesComparisonLayer->getLocalFactors();
$teamPerformancesToTeamPerformanceDifferencesLayerLocalFactors = $this->_TeamPerformancesToTeamPerformanceDifferencesLayer->getLocalFactors();
$teamDifferencesComparisonLayerLocalFactors = $this->_TeamDifferencesComparisonLayer->getLocalFactors();
$currentTeamPerfToTeamPerfDiff = &$teamPerformancesToTeamPerformanceDifferencesLayerLocalFactors[$i];
$currentTeamDiffComparison = &$teamDifferencesComparisonLayerLocalFactors[$i];
$currentTeamPerfToTeamPerfDiff = $teamPerformancesToTeamPerformanceDifferencesLayerLocalFactors[$i];
$currentTeamDiffComparison = $teamDifferencesComparisonLayerLocalFactors[$i];
$currentForwardSchedulePiece =
$this->scheduleSequence(
@@ -135,12 +138,12 @@ class IteratedTeamDifferencesInnerLayer extends TrueSkillFactorGraphLayer
$backwardScheduleList = array();
for ($i = 0; $i < $totalTeamDifferences - 1; $i++) {
$teamPerformancesToTeamPerformanceDifferencesLayerLocalFactors = &$this->_TeamPerformancesToTeamPerformanceDifferencesLayer->getLocalFactors();
$teamDifferencesComparisonLayerLocalFactors = &$this->_TeamDifferencesComparisonLayer->getLocalFactors();
$teamPerformancesToTeamPerformanceDifferencesLayerLocalFactors = $this->_TeamPerformancesToTeamPerformanceDifferencesLayer->getLocalFactors();
$teamDifferencesComparisonLayerLocalFactors = $this->_TeamDifferencesComparisonLayer->getLocalFactors();
$differencesFactor = &$teamPerformancesToTeamPerformanceDifferencesLayerLocalFactors[$totalTeamDifferences - 1 - $i];
$comparisonFactor = &$teamDifferencesComparisonLayerLocalFactors[$totalTeamDifferences - 1 - $i];
$performancesToDifferencesFactor = &$teamPerformancesToTeamPerformanceDifferencesLayerLocalFactors[$totalTeamDifferences - 1 - $i];
$differencesFactor = $teamPerformancesToTeamPerformanceDifferencesLayerLocalFactors[$totalTeamDifferences - 1 - $i];
$comparisonFactor = $teamDifferencesComparisonLayerLocalFactors[$totalTeamDifferences - 1 - $i];
$performancesToDifferencesFactor = $teamPerformancesToTeamPerformanceDifferencesLayerLocalFactors[$totalTeamDifferences - 1 - $i];
$currentBackwardSchedulePiece = new ScheduleSequence(
"current backward schedule piece",

33
src/TrueSkill/Layers/PlayerPerformancesToTeamPerformancesLayer.php
View File

@@ -9,17 +9,17 @@ use Moserware\Skills\TrueSkill\TrueSkillFactorGraph;
class PlayerPerformancesToTeamPerformancesLayer extends TrueSkillFactorGraphLayer
{
public function __construct(TrueSkillFactorGraph &$parentGraph)
public function __construct(TrueSkillFactorGraph $parentGraph)
{
parent::__construct($parentGraph);
}
public function buildLayer()
{
$inputVariablesGroups = &$this->getInputVariablesGroups();
foreach ($inputVariablesGroups as &$currentTeam) {
$localCurrentTeam = &$currentTeam;
$teamPerformance = &$this->createOutputVariable($localCurrentTeam);
$inputVariablesGroups = $this->getInputVariablesGroups();
foreach ($inputVariablesGroups as $currentTeam) {
$localCurrentTeam = $currentTeam;
$teamPerformance = $this->createOutputVariable($localCurrentTeam);
$newSumFactor = $this->createPlayerToTeamSumFactor($localCurrentTeam, $teamPerformance);
$this->addLayerFactor($newSumFactor);
@@ -32,9 +32,9 @@ class PlayerPerformancesToTeamPerformancesLayer extends TrueSkillFactorGraphLaye
public function createPriorSchedule()
{
$localFactors = &$this->getLocalFactors();
$localFactors = $this->getLocalFactors();
$sequence = &$this->scheduleSequence(
$sequence = $this->scheduleSequence(
array_map(
function ($weightedSumFactor) {
return new ScheduleStep("Perf to Team Perf Step", $weightedSumFactor, 0);
@@ -44,11 +44,11 @@ class PlayerPerformancesToTeamPerformancesLayer extends TrueSkillFactorGraphLaye
return $sequence;
}
protected function createPlayerToTeamSumFactor(&$teamMembers, &$sumVariable)
protected function createPlayerToTeamSumFactor($teamMembers, $sumVariable)
{
$weights = array_map(
function ($v) {
$player = &$v->getKey();
$player = $v->getKey();
return PartialPlay::getPartialPlayPercentage($player);
},
$teamMembers);
@@ -63,9 +63,9 @@ class PlayerPerformancesToTeamPerformancesLayer extends TrueSkillFactorGraphLaye
public function createPosteriorSchedule()
{
$allFactors = array();
$localFactors = &$this->getLocalFactors();
foreach ($localFactors as &$currentFactor) {
$localCurrentFactor = &$currentFactor;
$localFactors = $this->getLocalFactors();
foreach ($localFactors as $currentFactor) {
$localCurrentFactor = $currentFactor;
$numberOfMessages = $localCurrentFactor->getNumberOfMessages();
for ($currentIteration = 1; $currentIteration < $numberOfMessages; $currentIteration++) {
$allFactors[] = new ScheduleStep("team sum perf @" . $currentIteration,
@@ -75,15 +75,14 @@ class PlayerPerformancesToTeamPerformancesLayer extends TrueSkillFactorGraphLaye
return $this->scheduleSequence($allFactors, "all of the team's sum iterations");
}
private function &createOutputVariable(&$team)
private function createOutputVariable($team)
{
$memberNames = \array_map(function ($currentPlayer) {
$memberNames = array_map(function ($currentPlayer) {
return (string)($currentPlayer->getKey());
},
$team);
}, $team);
$teamMemberNames = \join(", ", $memberNames);
$outputVariable = &$this->getParentFactorGraph()->getVariableFactory()->createBasicVariable("Team[" . $teamMemberNames . "]'s performance");
$outputVariable = $this->getParentFactorGraph()->getVariableFactory()->createBasicVariable("Team[" . $teamMemberNames . "]'s performance");
return $outputVariable;
}
}

30
src/TrueSkill/Layers/PlayerPriorValuesToSkillsLayer.php
View File

@@ -13,7 +13,7 @@ class PlayerPriorValuesToSkillsLayer extends TrueSkillFactorGraphLayer
{
private $_teams;
public function __construct(TrueSkillFactorGraph &$parentGraph, array &$teams)
public function __construct(TrueSkillFactorGraph $parentGraph, array $teams)
{
parent::__construct($parentGraph);
$this->_teams = $teams;
@@ -21,17 +21,17 @@ class PlayerPriorValuesToSkillsLayer extends TrueSkillFactorGraphLayer
public function buildLayer()
{
$teams = &$this->_teams;
foreach ($teams as &$currentTeam) {
$localCurrentTeam = &$currentTeam;
$teams = $this->_teams;
foreach ($teams as $currentTeam) {
$localCurrentTeam = $currentTeam;
$currentTeamSkills = array();
$currentTeamAllPlayers = $localCurrentTeam->getAllPlayers();
foreach ($currentTeamAllPlayers as &$currentTeamPlayer) {
$localCurrentTeamPlayer = &$currentTeamPlayer;
foreach ($currentTeamAllPlayers as $currentTeamPlayer) {
$localCurrentTeamPlayer = $currentTeamPlayer;
$currentTeamPlayerRating = $currentTeam->getRating($localCurrentTeamPlayer);
$playerSkill = &$this->createSkillOutputVariable($localCurrentTeamPlayer);
$priorFactor = &$this->createPriorFactor($localCurrentTeamPlayer, $currentTeamPlayerRating, $playerSkill);
$playerSkill = $this->createSkillOutputVariable($localCurrentTeamPlayer);
$priorFactor = $this->createPriorFactor($localCurrentTeamPlayer, $currentTeamPlayerRating, $playerSkill);
$this->addLayerFactor($priorFactor);
$currentTeamSkills[] = $playerSkill;
}
@@ -43,17 +43,17 @@ class PlayerPriorValuesToSkillsLayer extends TrueSkillFactorGraphLayer
public function createPriorSchedule()
{
$localFactors = &$this->getLocalFactors();
$localFactors = $this->getLocalFactors();
return $this->scheduleSequence(
array_map(
function (&$prior) {
function ($prior) {
return new ScheduleStep("Prior to Skill Step", $prior, 0);
},
$localFactors),
"All priors");
}
private function createPriorFactor(&$player, Rating &$priorRating, Variable &$skillsVariable)
private function createPriorFactor($player, Rating $priorRating, Variable $skillsVariable)
{
return new GaussianPriorFactor(
$priorRating->getMean(),
@@ -63,11 +63,11 @@ class PlayerPriorValuesToSkillsLayer extends TrueSkillFactorGraphLayer
);
}
private function &createSkillOutputVariable(&$key)
private function createSkillOutputVariable($key)
{
$parentFactorGraph = &$this->getParentFactorGraph();
$variableFactory = &$parentFactorGraph->getVariableFactory();
$skillOutputVariable = &$variableFactory->createKeyedVariable($key, $key . "'s skill");
$parentFactorGraph = $this->getParentFactorGraph();
$variableFactory = $parentFactorGraph->getVariableFactory();
$skillOutputVariable = $variableFactory->createKeyedVariable($key, $key . "'s skill");
return $skillOutputVariable;
}
}

24
src/TrueSkill/Layers/PlayerSkillsToPerformancesLayer.php
View File

@@ -8,23 +8,23 @@ use Moserware\Skills\TrueSkill\Factors\GaussianLikelihoodFactor;
class PlayerSkillsToPerformancesLayer extends TrueSkillFactorGraphLayer
{
public function __construct(TrueSkillFactorGraph &$parentGraph)
public function __construct(TrueSkillFactorGraph $parentGraph)
{
parent::__construct($parentGraph);
}
public function buildLayer()
{
$inputVariablesGroups = &$this->getInputVariablesGroups();
$inputVariablesGroups = $this->getInputVariablesGroups();
$outputVariablesGroups = &$this->getOutputVariablesGroups();
foreach ($inputVariablesGroups as &$currentTeam) {
foreach ($inputVariablesGroups as $currentTeam) {
$currentTeamPlayerPerformances = array();
foreach ($currentTeam as &$playerSkillVariable) {
$localPlayerSkillVariable = &$playerSkillVariable;
$currentPlayer = &$localPlayerSkillVariable->getKey();
$playerPerformance = &$this->createOutputVariable($currentPlayer);
foreach ($currentTeam as $playerSkillVariable) {
$localPlayerSkillVariable = $playerSkillVariable;
$currentPlayer = $localPlayerSkillVariable->getKey();
$playerPerformance = $this->createOutputVariable($currentPlayer);
$newLikelihoodFactor = $this->createLikelihood($localPlayerSkillVariable, $playerPerformance);
$this->addLayerFactor($newLikelihoodFactor);
$currentTeamPlayerPerformances[] = $playerPerformance;
@@ -34,7 +34,7 @@ class PlayerSkillsToPerformancesLayer extends TrueSkillFactorGraphLayer
}
}
private function createLikelihood(KeyedVariable &$playerSkill, KeyedVariable &$playerPerformance)
private function createLikelihood(KeyedVariable $playerSkill, KeyedVariable $playerPerformance)
{
return new GaussianLikelihoodFactor(
BasicMath::square($this->getParentFactorGraph()->getGameInfo()->getBeta()),
@@ -43,15 +43,15 @@ class PlayerSkillsToPerformancesLayer extends TrueSkillFactorGraphLayer
);
}
private function &createOutputVariable(&$key)
private function createOutputVariable($key)
{
$outputVariable = &$this->getParentFactorGraph()->getVariableFactory()->createKeyedVariable($key, $key . "'s performance");
$outputVariable = $this->getParentFactorGraph()->getVariableFactory()->createKeyedVariable($key, $key . "'s performance");
return $outputVariable;
}
public function createPriorSchedule()
{
$localFactors = &$this->getLocalFactors();
$localFactors = $this->getLocalFactors();
return $this->scheduleSequence(
array_map(
function ($likelihood) {
@@ -63,7 +63,7 @@ class PlayerSkillsToPerformancesLayer extends TrueSkillFactorGraphLayer
public function createPosteriorSchedule()
{
$localFactors = &$this->getLocalFactors();
$localFactors = $this->getLocalFactors();
return $this->scheduleSequence(
array_map(
function ($likelihood) {

8
src/TrueSkill/Layers/TeamDifferencesComparisonLayer.php
View File

@@ -10,22 +10,22 @@ class TeamDifferencesComparisonLayer extends TrueSkillFactorGraphLayer
private $_epsilon;
private $_teamRanks;
public function __construct(TrueSkillFactorGraph &$parentGraph, array &$teamRanks)
public function __construct(TrueSkillFactorGraph $parentGraph, array $teamRanks)
{
parent::__construct($parentGraph);
$this->_teamRanks = $teamRanks;
$gameInfo = &$this->getParentFactorGraph()->getGameInfo();
$gameInfo = $this->getParentFactorGraph()->getGameInfo();
$this->_epsilon = DrawMargin::getDrawMarginFromDrawProbability($gameInfo->getDrawProbability(), $gameInfo->getBeta());
}
public function buildLayer()
{
$inputVarGroups = &$this->getInputVariablesGroups();
$inputVarGroups = $this->getInputVariablesGroups();
$inputVarGroupsCount = count($inputVarGroups);
for ($i = 0; $i < $inputVarGroupsCount; $i++) {
$isDraw = ($this->_teamRanks[$i] == $this->_teamRanks[$i + 1]);
$teamDifference = &$inputVarGroups[$i][0];
$teamDifference = $inputVarGroups[$i][0];
$factor =
$isDraw

19
src/TrueSkill/Layers/TeamPerformancesToTeamPerformanceDifferencesLayer.php
View File

@@ -6,23 +6,23 @@ use Moserware\Skills\TrueSkill\Factors\GaussianWeightedSumFactor;
class TeamPerformancesToTeamPerformanceDifferencesLayer extends TrueSkillFactorGraphLayer
{
public function __construct(TrueSkillFactorGraph &$parentGraph)
public function __construct(TrueSkillFactorGraph $parentGraph)
{
parent::__construct($parentGraph);
}
public function buildLayer()
{
$inputVariablesGroups = &$this->getInputVariablesGroups();
$inputVariablesGroups = $this->getInputVariablesGroups();
$inputVariablesGroupsCount = count($inputVariablesGroups);
$outputVariablesGroup = &$this->getOutputVariablesGroups();
for ($i = 0; $i < $inputVariablesGroupsCount - 1; $i++)
{
$strongerTeam = &$inputVariablesGroups[$i][0];
$weakerTeam = &$inputVariablesGroups[$i + 1][0];
$strongerTeam = $inputVariablesGroups[$i][0];
$weakerTeam = $inputVariablesGroups[$i + 1][0];
$currentDifference = &$this->createOutputVariable();
$currentDifference = $this->createOutputVariable();
$newDifferencesFactor = $this->createTeamPerformanceToDifferenceFactor($strongerTeam, $weakerTeam, $currentDifference);
$this->addLayerFactor($newDifferencesFactor);
@@ -31,17 +31,18 @@ class TeamPerformancesToTeamPerformanceDifferencesLayer extends TrueSkillFactorG
}
}
private function createTeamPerformanceToDifferenceFactor(
Variable &$strongerTeam, Variable &$weakerTeam, Variable &$output)
private function createTeamPerformanceToDifferenceFactor(Variable $strongerTeam,
Variable $weakerTeam,
Variable $output)
{
$teams = array($strongerTeam, $weakerTeam);
$weights = array(1.0, -1.0);
return new GaussianWeightedSumFactor($output, $teams, $weights);
}
private function &createOutputVariable()
private function createOutputVariable()
{
$outputVariable = &$this->getParentFactorGraph()->getVariableFactory()->createBasicVariable("Team performance difference");
$outputVariable = $this->getParentFactorGraph()->getVariableFactory()->createBasicVariable("Team performance difference");
return $outputVariable;
}
}

2
src/TrueSkill/Layers/TrueSkillFactorGraphLayer.php
View File

@@ -5,7 +5,7 @@ use Moserware\Skills\TrueSkill\TrueSkillFactorGraph;
abstract class TrueSkillFactorGraphLayer extends FactorGraphLayer
{
public function __construct(TrueSkillFactorGraph &$parentGraph)
public function __construct(TrueSkillFactorGraph $parentGraph)
{
parent::__construct($parentGraph);
}

35
src/TrueSkill/TrueSkillFactorGraph.php
View File

@@ -1,6 +1,7 @@
<?php namespace Moserware\Skills\TrueSkill;
use Moserware\Skills\GameInfo;
use Moserware\Skills\Numerics\GaussianDistribution;
use Moserware\Skills\Rating;
use Moserware\Skills\RatingContainer;
use Moserware\Skills\FactorGraphs\FactorGraph;
@@ -20,7 +21,7 @@ class TrueSkillFactorGraph extends FactorGraph
private $_layers;
private $_priorLayer;
public function __construct(GameInfo &$gameInfo, array &$teams, array $teamRanks)
public function __construct(GameInfo $gameInfo, array $teams, array $teamRanks)
{
$this->_priorLayer = new PlayerPriorValuesToSkillsLayer($this, $teams);
$this->_gameInfo = $gameInfo;
@@ -50,15 +51,15 @@ class TrueSkillFactorGraph extends FactorGraph
{
$lastOutput = null;
$layers = &$this->_layers;
foreach ($layers as &$currentLayer) {
$layers = $this->_layers;
foreach ($layers as $currentLayer) {
if ($lastOutput != null) {
$currentLayer->setInputVariablesGroups($lastOutput);
}
$currentLayer->buildLayer();
$lastOutput = &$currentLayer->getOutputVariablesGroups();
$lastOutput = $currentLayer->getOutputVariablesGroups();
}
}
@@ -72,11 +73,11 @@ class TrueSkillFactorGraph extends FactorGraph
{
$factorList = new FactorList();
$layers = &$this->_layers;
foreach ($layers as &$currentLayer) {
$localFactors = &$currentLayer->getLocalFactors();
foreach ($localFactors as &$currentFactor) {
$localCurrentFactor = &$currentFactor;
$layers = $this->_layers;
foreach ($layers as $currentLayer) {
$localFactors = $currentLayer->getLocalFactors();
foreach ($localFactors as $currentFactor) {
$localCurrentFactor = $currentFactor;
$factorList->addFactor($localCurrentFactor);
}
}
@@ -89,17 +90,17 @@ class TrueSkillFactorGraph extends FactorGraph
{
$fullSchedule = array();
$layers = &$this->_layers;
foreach ($layers as &$currentLayer) {
$layers = $this->_layers;
foreach ($layers as $currentLayer) {
$currentPriorSchedule = $currentLayer->createPriorSchedule();
if ($currentPriorSchedule != null) {
$fullSchedule[] = $currentPriorSchedule;
}
}
$allLayersReverse = \array_reverse($this->_layers);
$allLayersReverse = array_reverse($this->_layers);
foreach ($allLayersReverse as &$currentLayer) {
foreach ($allLayersReverse as $currentLayer) {
$currentPosteriorSchedule = $currentLayer->createPosteriorSchedule();
if ($currentPosteriorSchedule != null) {
$fullSchedule[] = $currentPosteriorSchedule;
@@ -113,10 +114,10 @@ class TrueSkillFactorGraph extends FactorGraph
{
$result = new RatingContainer();
$priorLayerOutputVariablesGroups = &$this->_priorLayer->getOutputVariablesGroups();
foreach ($priorLayerOutputVariablesGroups as &$currentTeam) {
foreach ($currentTeam as &$currentPlayer) {
$localCurrentPlayer = &$currentPlayer->getKey();
$priorLayerOutputVariablesGroups = $this->_priorLayer->getOutputVariablesGroups();
foreach ($priorLayerOutputVariablesGroups as $currentTeam) {
foreach ($currentTeam as $currentPlayer) {
$localCurrentPlayer = $currentPlayer->getKey();
$newRating = new Rating($currentPlayer->getValue()->getMean(),
$currentPlayer->getValue()->getStandardDeviation());

6
src/TrueSkill/TruncatedGaussianCorrectionFunctions.php
View File

@@ -38,8 +38,12 @@ class TruncatedGaussianCorrectionFunctions
*
* In the reference F# implementation, this is referred to as "the multiplicative
* correction of a single-sided truncated Gaussian with unit variance."
*
* @param $teamPerformanceDifference
* @param $drawMargin
* @param $c
* @return float
*/
public static function wExceedsMarginScaled($teamPerformanceDifference, $drawMargin, $c)
{
return self::wExceedsMargin($teamPerformanceDifference / $c, $drawMargin / $c);

23
src/TrueSkill/TwoPlayerTrueSkillCalculator.php
View File

@@ -9,7 +9,6 @@ use Moserware\Skills\Rating;
use Moserware\Skills\RatingContainer;
use Moserware\Skills\SkillCalculator;
use Moserware\Skills\SkillCalculatorSupportedOptions;
use Moserware\Skills\PlayersRange;
use Moserware\Skills\TeamsRange;
@@ -126,7 +125,7 @@ class TwoPlayerTrueSkillCalculator extends SkillCalculator
/**
* {@inheritdoc }
*/
public function calculateMatchQuality(GameInfo $gameInfo, array &$teams)
public function calculateMatchQuality(GameInfo $gameInfo, array $teams)
{
Guard::argumentNotNull($gameInfo, "gameInfo");
$this->validateTeamCountAndPlayersCountPerTeam($teams);
@@ -146,18 +145,18 @@ class TwoPlayerTrueSkillCalculator extends SkillCalculator
$player2SigmaSquared = BasicMath::square($player2Rating->getStandardDeviation());
// This is the square root part of the equation:
$sqrtPart =
sqrt(
(2*$betaSquared)
/
(2*$betaSquared + $player1SigmaSquared + $player2SigmaSquared));
$sqrtPart = sqrt(
(2*$betaSquared)
/
(2*$betaSquared + $player1SigmaSquared + $player2SigmaSquared)
);
// This is the exponent part of the equation:
$expPart =
exp(
(-1*BasicMath::square($player1Rating->getMean() - $player2Rating->getMean()))
/
(2*(2*$betaSquared + $player1SigmaSquared + $player2SigmaSquared)));
$expPart = exp(
(-1*BasicMath::square($player1Rating->getMean() - $player2Rating->getMean()))
/
(2*(2*$betaSquared + $player1SigmaSquared + $player2SigmaSquared))
);
return $sqrtPart*$expPart;
}

10
src/TrueSkill/TwoTeamTrueSkillCalculator.php
View File

@@ -57,7 +57,7 @@ class TwoTeamTrueSkillCalculator extends SkillCalculator
}
private static function updatePlayerRatings(GameInfo $gameInfo,
RatingContainer &$newPlayerRatings,
RatingContainer $newPlayerRatings,
Team $selfTeam,
Team $otherTeam,
$selfToOtherTeamComparison)
@@ -119,9 +119,9 @@ class TwoTeamTrueSkillCalculator extends SkillCalculator
$rankMultiplier = 1;
}
$selfTeamAllPlayers = &$selfTeam->getAllPlayers();
foreach ($selfTeamAllPlayers as &$selfTeamCurrentPlayer) {
$localSelfTeamCurrentPlayer = &$selfTeamCurrentPlayer;
$selfTeamAllPlayers = $selfTeam->getAllPlayers();
foreach ($selfTeamAllPlayers as $selfTeamCurrentPlayer) {
$localSelfTeamCurrentPlayer = $selfTeamCurrentPlayer;
$previousPlayerRating = $selfTeam->getRating($localSelfTeamCurrentPlayer);
$meanMultiplier = (BasicMath::square($previousPlayerRating->getStandardDeviation()) + $tauSquared) / $c;
@@ -141,7 +141,7 @@ class TwoTeamTrueSkillCalculator extends SkillCalculator
/**
* {@inheritdoc}
*/
public function calculateMatchQuality(GameInfo $gameInfo, array &$teams)
public function calculateMatchQuality(GameInfo $gameInfo, array $teams)
{
Guard::argumentNotNull($gameInfo, "gameInfo");
$this->validateTeamCountAndPlayersCountPerTeam($teams);