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<?php
declare(strict_types=1);
namespace Phpml\Helper\Optimizer;
use Closure;
use Phpml\Exception\InvalidArgumentException;
abstract class Optimizer
{
/**
* Unknown variables to be found
*
* @var array
*/
protected $theta = [];
* Number of dimensions
* @var int
protected $dimensions;
* Inits a new instance of Optimizer for the given number of dimensions
public function __construct(int $dimensions)
$this->dimensions = $dimensions;
// Inits the weights randomly
$this->theta = [];
for ($i = 0; $i < $this->dimensions; ++$i) {
$this->theta[] = (random_int(0, PHP_INT_MAX) / PHP_INT_MAX) + 0.1;
}
public function setTheta(array $theta): self
if (count($theta) !== $this->dimensions) {
throw new InvalidArgumentException(sprintf('Number of values in the weights array should be %s', $this->dimensions));
$this->theta = $theta;
return $this;
public function theta(): array
return $this->theta;
* Executes the optimization with the given samples & targets
* and returns the weights
abstract public function runOptimization(array $samples, array $targets, Closure $gradientCb): array;