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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; }
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