73 lines
2.0 KiB
PHP
73 lines
2.0 KiB
PHP
<?php
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declare(strict_types=1);
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namespace Phpml;
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use Phpml\Exception\InvalidArgumentException;
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final class FeatureUnion implements Transformer
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{
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/**
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* @var Pipeline[]
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*/
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private $pipelines = [];
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/**
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* @var Pipeline[]
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*/
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public function __construct(array $pipelines)
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{
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if ($pipelines === []) {
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throw new InvalidArgumentException('At least one pipeline is required');
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}
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$this->pipelines = array_map(static function (Pipeline $pipeline): Pipeline {
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return $pipeline;
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}, $pipelines);
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}
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public function fit(array $samples, ?array $targets = null): void
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{
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$originSamples = $samples;
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foreach ($this->pipelines as $pipeline) {
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foreach ($pipeline->getTransformers() as $transformer) {
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$transformer->fit($samples, $targets);
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$transformer->transform($samples, $targets);
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}
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$samples = $originSamples;
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}
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}
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public function transform(array &$samples, ?array &$targets = null): void
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{
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$this->transformSamples($samples, $targets);
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}
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public function fitAndTransform(array &$samples, ?array &$targets = null): void
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{
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$this->transformSamples($samples, $targets, true);
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}
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private function transformSamples(array &$samples, ?array &$targets = null, bool $fit = false): void
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{
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$union = [];
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$originSamples = $samples;
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foreach ($this->pipelines as $pipeline) {
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foreach ($pipeline->getTransformers() as $transformer) {
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if ($fit) {
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$transformer->fit($samples, $targets);
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}
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$transformer->transform($samples, $targets);
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}
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foreach ($samples as $index => $sample) {
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$union[$index] = array_merge($union[$index] ?? [], is_array($sample) ? $sample : [$sample]);
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}
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$samples = $originSamples;
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}
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$samples = $union;
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}
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}
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