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<?php |
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declare (strict_types = 1); |
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namespace Phpml\Preprocessing; |
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use Phpml\Preprocessing\Imputer\Strategy; |
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class Imputer implements Preprocessor |
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{ |
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const AXIS_COLUMN = 0; |
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const AXIS_ROW = 1; |
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/** |
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* @var mixed |
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*/ |
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private $missingValue; |
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/** |
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* @var Strategy |
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*/ |
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private $strategy; |
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/** |
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* @var int |
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*/ |
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private $axis; |
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/** |
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* @param mixed $missingValue |
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* @param Strategy $strategy |
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* @param int $axis |
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*/ |
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public function __construct($missingValue = null, Strategy $strategy, int $axis = self::AXIS_COLUMN) |
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{ |
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$this->missingValue = $missingValue; |
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$this->strategy = $strategy; |
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$this->axis = $axis; |
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} |
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/** |
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* @param array $samples |
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*/ |
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public function preprocess(array &$samples) |
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{ |
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foreach ($samples as &$sample) { |
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$this->preprocessSample($sample, $samples); |
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} |
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} |
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/** |
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* @param array $sample |
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* @param array $samples |
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*/ |
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private function preprocessSample(array &$sample, array $samples) |
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{ |
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foreach ($sample as $column => &$value) { |
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if ($value === $this->missingValue) { |
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$value = $this->strategy->replaceValue($this->getAxis($column, $sample, $samples)); |
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} |
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} |
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} |
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/** |
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* @param int $column |
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* @param array $currentSample |
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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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private function getAxis(int $column, array $currentSample, array $samples): array |
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{ |
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if (self::AXIS_ROW === $this->axis) { |
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return array_diff($currentSample, [$this->missingValue]); |
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} |
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$axis = []; |
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foreach ($samples as $sample) { |
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if ($sample[$column] !== $this->missingValue) { |
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$axis[] = $sample[$column]; |
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} |
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} |
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return $axis; |
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} |
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} |
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php-ai /
php-ml
