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<?php |
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declare (strict_types = 1); |
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namespace Phpml\SupportVectorMachine; |
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class SupportVectorMachine |
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{ |
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/** |
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* @var int |
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*/ |
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private $type; |
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/** |
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* @var int |
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*/ |
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private $kernel; |
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/** |
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* @var float |
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*/ |
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private $cost; |
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/** |
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* @var string |
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*/ |
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private $binPath; |
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/** |
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* @var string |
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*/ |
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private $varPath; |
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/** |
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* @var string |
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*/ |
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private $model; |
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/** |
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* @var array |
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*/ |
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private $labels; |
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/** |
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* @param int $type |
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* @param int $kernel |
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* @param float $cost |
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*/ |
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public function __construct(int $type, int $kernel, float $cost) |
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{ |
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$this->type = $type; |
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$this->kernel = $kernel; |
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$this->cost = $cost; |
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$rootPath = realpath(implode(DIRECTORY_SEPARATOR, [dirname(__FILE__), '..', '..', '..'])).DIRECTORY_SEPARATOR; |
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$this->binPath = $rootPath.'bin'.DIRECTORY_SEPARATOR.'libsvm'.DIRECTORY_SEPARATOR; |
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$this->varPath = $rootPath.'var'.DIRECTORY_SEPARATOR; |
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} |
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/** |
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* @param array $samples |
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* @param array $labels |
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*/ |
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public function train(array $samples, array $labels) |
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{ |
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$this->labels = $labels; |
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$trainingSet = DataTransformer::trainingSet($samples, $labels); |
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file_put_contents($trainingSetFileName = $this->varPath.uniqid(), $trainingSet); |
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$modelFileName = $trainingSetFileName.'-model'; |
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$command = sprintf('%ssvm-train%s -s %s -t %s -c %s %s %s', $this->binPath, $this->getOSExtension(), $this->type, $this->kernel, $this->cost, $trainingSetFileName, $modelFileName); |
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$output = ''; |
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exec(escapeshellcmd($command), $output); |
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$this->model = file_get_contents($modelFileName); |
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unlink($trainingSetFileName); |
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unlink($modelFileName); |
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} |
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/** |
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* @return string |
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*/ |
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public function getModel() |
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{ |
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return $this->model; |
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} |
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/** |
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* @param array $samples |
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* |
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* @return array |
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*/ |
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public function predict(array $samples) |
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{ |
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$testSet = DataTransformer::testSet($samples); |
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file_put_contents($testSetFileName = $this->varPath.uniqid(), $testSet); |
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$modelFileName = $testSetFileName.'-model'; |
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file_put_contents($modelFileName, $this->model); |
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$outputFileName = $testSetFileName.'-output'; |
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$command = sprintf('%ssvm-predict%s %s %s %s', $this->binPath, $this->getOSExtension(), $testSetFileName, $modelFileName, $outputFileName); |
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$output = ''; |
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exec(escapeshellcmd($command), $output); |
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$predictions = file_get_contents($outputFileName); |
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unlink($testSetFileName); |
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unlink($modelFileName); |
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unlink($outputFileName); |
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return DataTransformer::results($predictions, $this->labels); |
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} |
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/** |
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* @return string |
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*/ |
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private function getOSExtension() |
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{ |
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if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') { |
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return '.exe'; |
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} |
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return ''; |
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} |
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128
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} |
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php-ai /
php-ml
