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<?php |
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namespace devfym\IntelliPHP\Regression; |
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use devfym\IntelliPHP\Data\DataFrame; |
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class LinearRegression |
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{ |
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/** |
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* @var array |
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*/ |
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private $xColumn; |
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/** |
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* @var array |
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*/ |
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private $yColumn; |
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/** |
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* @var int |
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*/ |
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private $df; |
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/** |
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* @var float |
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*/ |
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private $slope; |
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/** |
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* @var float |
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*/ |
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private $intercept; |
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/** |
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* @var String |
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*/ |
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private $metric; |
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/** |
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* LinearRegression constructor. |
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*/ |
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public function __construct() |
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{ |
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$this->xColumn = ''; |
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$this->yColumn = ''; |
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$this->df = new DataFrame(); |
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$this->slope = 0; |
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$this->intercept = 0; |
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} |
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/** |
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* @param DataFrame $df |
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*/ |
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public function setTrain(DataFrame $df) : void |
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{ |
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$this->df = $df; |
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} |
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/** |
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* @param string $xColumn |
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* @param string $yColumn |
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* @param string $metric |
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*/ |
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public function model($xColumn = '', $yColumn = '', $metric = '') : void |
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{ |
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$this->xColumn = $xColumn; |
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$this->yColumn = $yColumn; |
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$mx = $this->df->{$xColumn}->mean(); |
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$my = $this->df->{$yColumn}->mean(); |
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$this->slope = $my / $mx; |
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$this->intercept = $my - ($mx * $this->slope); |
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$this->metric = $metric; |
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} |
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/** |
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* @param array $x |
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* @return array |
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*/ |
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public function predict($x = []) : array |
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{ |
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$y = []; |
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foreach ($x as $p) { |
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array_push($y, round(($p * $this->slope) + $this->intercept, 2)); |
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} |
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return $y; |
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} |
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/** |
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* @param $y_train |
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* @param $y_test |
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* @return float |
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*/ |
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public function validate($y_train, $y_test) : float |
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{ |
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$n = count($y_train); |
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$total_diff = 0; |
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if ($this->metric == 'mean_squared_error') { |
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for ($i = 0; $i < $n; $i++) { |
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$total_diff += $y_test[$i] - $y_train[$i]; |
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} |
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$total_diff /= $n; |
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} |
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return round($total_diff, 4); |
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} |
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public function saveModel() : string |
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{ |
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$model = [ |
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'type' => 'LinearRegression', |
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'xColumn' => $this->xColumn, |
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'yColumn' => $this->yColumn, |
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'slope' => $this->slope, |
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'intercept' => $this->intercept, |
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'metric' => $this->metric |
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]; |
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return json_encode($model); |
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} |
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public function loadModel($model = '') : void |
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{ |
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$model = json_decode($model); |
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$this->xColumn = $model->xColumn; |
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$this->yColumn = $model->yColumn; |
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$this->slope = $model->slope; |
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$this->intercept = $model->intercept; |
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$this->metric = $model->metric; |
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} |
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} |
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devfym /
intelliphp
Loading history...
Our type inference engine has found an assignment to a property that is incompatible with the declared type of that property.
Either this assignment is in error or the assigned type should be added to the documentation/type hint for that property..