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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 DataTransformer |
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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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* @return string |
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*/ |
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public static function trainingSet(array $samples, array $labels): string |
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{ |
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$set = ''; |
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$numericLabels = self::numericLabels($labels); |
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foreach ($labels as $index => $label) { |
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$set .= sprintf('%s %s %s', $numericLabels[$label], self::sampleRow($samples[$index]), PHP_EOL); |
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} |
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return $set; |
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} |
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/** |
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* @param array $samples |
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* |
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* @return string |
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*/ |
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public static function testSet(array $samples): string |
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{ |
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$set = ''; |
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foreach ($samples as $sample) { |
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$set .= sprintf('0 %s %s', self::sampleRow($sample), PHP_EOL); |
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} |
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return $set; |
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} |
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/** |
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* @param string $resultString |
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* @param array $labels |
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* |
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* @return array |
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*/ |
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public static function results(string $resultString, array $labels): array |
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{ |
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$numericLabels = self::numericLabels($labels); |
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$results = []; |
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foreach (explode(PHP_EOL, $resultString) as $result) { |
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$results[] = array_search($result, $numericLabels); |
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} |
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return $results; |
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} |
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/** |
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* @param array $labels |
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* |
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* @return array |
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*/ |
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public static function numericLabels(array $labels): array |
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{ |
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$numericLabels = []; |
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foreach ($labels as $label) { |
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if (isset($numericLabels[$label])) { |
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continue; |
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} |
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$numericLabels[$label] = count($numericLabels); |
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} |
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return $numericLabels; |
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} |
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/** |
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* @param array $sample |
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* |
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* @return string |
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*/ |
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private static function sampleRow(array $sample): string |
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{ |
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$row = []; |
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foreach ($sample as $index => $feature) { |
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$row[] = sprintf('%s:%s', $index + 1, $feature); |
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} |
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return implode(' ', $row); |
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} |
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} |
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php-ai /
php-ml
