DecisionNode::purityIncrease() - Code Metrics - php-ai/php-ml - Measure and Improve Code Quality continuously with Scrutinizer

DecisionNode::purityIncrease() A
last analyzed 2020-05-15 05:48 UTC

↳ Parent: DecisionNode

Complexity

Conditions	3
Paths	4

Size

Total Lines	15
Code Lines	8

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
eloc	8
c	1
b	0
f	0
dl	0
loc	15
rs	10
cc	3
nc	4
nop	0

<?php

declare(strict_types=1);

namespace Phpml\Tree\Node;

use Phpml\Exception\InvalidArgumentException;

class DecisionNode extends BinaryNode implements PurityNode
{
    /**
     * @var int
     */
    private $column;

    /**
     * @var mixed
     */
    private $value;

    /**
     * @var array
     */
    private $groups = [];

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

    /**
     * @var int
     */
    private $samplesCount;

    /**
     * @param mixed $value
     */
    public function __construct(int $column, $value, array $groups, float $impurity)
    {
        if (count($groups) !== 2) {
            throw new InvalidArgumentException('The number of groups must be exactly two.');
        }

        if ($impurity < 0.) {
            throw new InvalidArgumentException('Impurity cannot be less than 0.');
        }

        $this->column = $column;
        $this->value = $value;
        $this->groups = $groups;
        $this->impurity = $impurity;
        $this->samplesCount = (int) array_sum(array_map(static function (array $group): int {
            return count($group[0]);
        }, $groups));
    }

    public function column(): int
    {
        return $this->column;
    }

    /**
     * @return mixed
     */
    public function value()
    {
        return $this->value;
    }

    public function groups(): array
    {
        return $this->groups;
    }

    public function impurity(): float
    {
        return $this->impurity;
    }

    public function samplesCount(): int
    {
        return $this->samplesCount;
    }

    public function purityIncrease(): float
    {
        $impurity = $this->impurity;

        if ($this->left() instanceof PurityNode) {
            $impurity -= $this->left()->impurity()
                * ($this->left()->samplesCount() / $this->samplesCount);
        }

        if ($this->right() instanceof PurityNode) {
            $impurity -= $this->right()->impurity()
                * ($this->right()->samplesCount() / $this->samplesCount);
        }

        return $impurity;
    }

    public function cleanup(): void
    {
        $this->groups = [[], []];
    }
}


1			<?php
2
3			declare(strict_types=1);
4
5			namespace Phpml\Tree\Node;
6
7			use Phpml\Exception\InvalidArgumentException;
8
9			class DecisionNode extends BinaryNode implements PurityNode
10			{
11			/**
12			* @var int
13			*/
14			private $column;
15
16			/**
17			* @var mixed
18			*/
19			private $value;
20
21			/**
22			* @var array
23			*/
24			private $groups = [];
25
26			/**
27			* @var float
28			*/
29			private $impurity;
30
31			/**
32			* @var int
33			*/
34			private $samplesCount;
35
36			/**
37			* @param mixed $value
38			*/
39			public function __construct(int $column, $value, array $groups, float $impurity)
40			{
41			if (count($groups) !== 2) {
42			throw new InvalidArgumentException('The number of groups must be exactly two.');
43			}
44
45			if ($impurity < 0.) {
46			throw new InvalidArgumentException('Impurity cannot be less than 0.');
47			}
48
49			$this->column = $column;
50			$this->value = $value;
51			$this->groups = $groups;
52			$this->impurity = $impurity;
53			$this->samplesCount = (int) array_sum(array_map(static function (array $group): int {
54			return count($group[0]);
55			}, $groups));
56			}
57
58			public function column(): int
59			{
60			return $this->column;
61			}
62
63			/**
64			* @return mixed
65			*/
66			public function value()
67			{
68			return $this->value;
69			}
70
71			public function groups(): array
72			{
73			return $this->groups;
74			}
75
76			public function impurity(): float
77			{
78			return $this->impurity;
79			}
80
81			public function samplesCount(): int
82			{
83			return $this->samplesCount;
84			}
85
86			public function purityIncrease(): float
87			{
88			$impurity = $this->impurity;
89
90			if ($this->left() instanceof PurityNode) {
91			$impurity -= $this->left()->impurity()
92			* ($this->left()->samplesCount() / $this->samplesCount);
93			}
94
95			if ($this->right() instanceof PurityNode) {
96			$impurity -= $this->right()->impurity()
97			* ($this->right()->samplesCount() / $this->samplesCount);
98			}
99
100			return $impurity;
101			}
102
103			public function cleanup(): void
104			{
105			$this->groups = [[], []];
106			}
107			}
108

php-ai / php-ml

DecisionNode::purityIncrease() A last analyzed 2020-05-15 05:48 UTC

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DecisionNode::purityIncrease() A
last analyzed 2020-05-15 05:48 UTC