LeastSquares::getCoefficients() - Code Metrics - Inspection of "php-cs-fxier" - php-ai/php-ml - Measure and Improve Code Quality continuously with Scrutinizer

Completed

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by Arkadiusz

created 2016-04-29 22:59 UTC

LeastSquares::getCoefficients() A

↳ Parent: LeastSquares

Complexity

Conditions	1
Paths	1

Size

Total Lines	4
Code Lines	2

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
c	1
b	0
f	0
dl	0
loc	4
rs	10
cc	1
eloc	2
nc	1
nop	0

<?php

declare (strict_types = 1);

namespace Phpml\Regression;

use Phpml\Math\Matrix;

class LeastSquares implements Regression
{
    /**
     * @var array
     */
    private $samples;

    /**
     * @var array
     */
    private $targets;

    /**
     * @var float
     */
    private $intercept;

    /**
     * @var array
     */
    private $coefficients;

    /**
     * @param array $samples
     * @param array $targets
     */
    public function train(array $samples, array $targets)
    {
        $this->samples = $samples;
        $this->targets = $targets;

        $this->computeCoefficients();
    }

    /**
     * @param array $sample
     *
     * @return mixed
     */
    public function predict($sample)
    {
        $result = $this->intercept;
        foreach ($this->coefficients as $index => $coefficient) {
            $result += $coefficient * $sample[$index];
        }

        return $result;
    }

    /**
     * @return array
     */
    public function getCoefficients()
    {
        return $this->coefficients;
    }

    /**
     * coefficient(b) = (X'X)-1X'Y.
     */
    private function computeCoefficients()
    {
        $samplesMatrix = new Matrix($this->samples);
        $targetsMatrix = new Matrix($this->targets);

        $ts = $samplesMatrix->transpose()->multiply($samplesMatrix)->inverse();
        $tf = $samplesMatrix->transpose()->multiply($targetsMatrix);

        $this->coefficients = $ts->multiply($tf)->getColumnValues(0);
        $this->intercept = array_shift($this->coefficients);
    }
}


1			<?php
2
3			declare (strict_types = 1);
4
5			namespace Phpml\Regression;
6
7			use Phpml\Math\Matrix;
8
9			class LeastSquares implements Regression
10			{
11			/**
12			* @var array
13			*/
14			private $samples;
15
16			/**
17			* @var array
18			*/
19			private $targets;
20
21			/**
22			* @var float
23			*/
24			private $intercept;
25
26			/**
27			* @var array
28			*/
29			private $coefficients;
30
31			/**
32			* @param array $samples
33			* @param array $targets
34			*/
35			public function train(array $samples, array $targets)
36			{
37			$this->samples = $samples;
38			$this->targets = $targets;
39
40			$this->computeCoefficients();
41			}
42
43			/**
44			* @param array $sample
45			*
46			* @return mixed
47			*/
48			public function predict($sample)
49			{
50			$result = $this->intercept;
51			foreach ($this->coefficients as $index => $coefficient) {
52			$result += $coefficient * $sample[$index];
53			}
54
55			return $result;
56			}
57
58			/**
59			* @return array
60			*/
61			public function getCoefficients()
62			{
63			return $this->coefficients;
64			}
65
66			/**
67			* coefficient(b) = (X'X)-1X'Y.
68			*/
69			private function computeCoefficients()
70			{
71			$samplesMatrix = new Matrix($this->samples);
72			$targetsMatrix = new Matrix($this->targets);
73
74			$ts = $samplesMatrix->transpose()->multiply($samplesMatrix)->inverse();
75			$tf = $samplesMatrix->transpose()->multiply($targetsMatrix);
76
77			$this->coefficients = $ts->multiply($tf)->getColumnValues(0);
78			$this->intercept = array_shift($this->coefficients);
79			}
80			}
81

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LeastSquares::getCoefficients() A

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