php-ml/src/FeatureUnion.php

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2019-05-14 19:26:25 +00:00
<?php
declare(strict_types=1);
namespace Phpml;
use Phpml\Exception\InvalidArgumentException;
final class FeatureUnion implements Transformer
{
/**
* @var Pipeline[]
*/
private $pipelines = [];
/**
* @var Pipeline[]
*/
public function __construct(array $pipelines)
{
if ($pipelines === []) {
throw new InvalidArgumentException('At least one pipeline is required');
}
$this->pipelines = array_map(static function (Pipeline $pipeline): Pipeline {
return $pipeline;
}, $pipelines);
}
public function fit(array $samples, ?array $targets = null): void
{
$originSamples = $samples;
foreach ($this->pipelines as $pipeline) {
foreach ($pipeline->getTransformers() as $transformer) {
$transformer->fit($samples, $targets);
$transformer->transform($samples, $targets);
}
$samples = $originSamples;
}
}
public function transform(array &$samples, ?array &$targets = null): void
{
$this->transformSamples($samples, $targets);
}
public function fitAndTransform(array &$samples, ?array &$targets = null): void
{
$this->transformSamples($samples, $targets, true);
}
private function transformSamples(array &$samples, ?array &$targets = null, bool $fit = false): void
{
$union = [];
$originSamples = $samples;
foreach ($this->pipelines as $pipeline) {
foreach ($pipeline->getTransformers() as $transformer) {
if ($fit) {
$transformer->fit($samples, $targets);
}
$transformer->transform($samples, $targets);
}
foreach ($samples as $index => $sample) {
$union[$index] = array_merge($union[$index] ?? [], is_array($sample) ? $sample : [$sample]);
}
$samples = $originSamples;
}
$samples = $union;
}
}