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Constant.php
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Constant.php
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<?php
namespace Rubix\ML\NeuralNet\Initializers;
use Tensor\Matrix;
use Rubix\ML\Exceptions\InvalidArgumentException;
/**
* Constant
*
* Initialize the parameter to a user specified constant value.
*
* @category Machine Learning
* @package Rubix/ML
* @author Andrew DalPino
*/
class Constant implements Initializer
{
/**
* The value to initialize the parameter to.
*
* @var float
*/
protected float $value;
/**
* @param float $value
* @throws InvalidArgumentException
*/
public function __construct(float $value = 0.0)
{
if (is_nan($value)) {
throw new InvalidArgumentException('Cannot initialize'
. ' weight values to NaN.');
}
$this->value = $value;
}
/**
* Initialize a weight matrix W in the dimensions fan in x fan out.
*
* @internal
*
* @param int<0,max> $fanIn
* @param int<0,max> $fanOut
* @return Matrix
*/
public function initialize(int $fanIn, int $fanOut) : Matrix
{
return Matrix::fill($this->value, $fanOut, $fanIn);
}
/**
* Return the string representation of the object.
*
* @internal
*
* @return string
*/
public function __toString() : string
{
return "Constant (value: {$this->value})";
}
}