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1 | <?php |
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2 | |||
3 | declare(strict_types=1); |
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4 | |||
5 | namespace Phpml\Tree\Node; |
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6 | |||
7 | use Phpml\Exception\InvalidArgumentException; |
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8 | |||
9 | class DecisionNode extends BinaryNode implements PurityNode |
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10 | { |
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11 | /** |
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12 | * @var int |
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13 | */ |
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14 | private $column; |
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15 | |||
16 | /** |
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17 | * @var mixed |
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18 | */ |
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19 | private $value; |
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20 | |||
21 | /** |
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22 | * @var array |
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23 | */ |
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24 | private $groups = []; |
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25 | |||
26 | /** |
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27 | * @var float |
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28 | */ |
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29 | private $impurity; |
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30 | |||
31 | /** |
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32 | * @var int |
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33 | */ |
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34 | private $samplesCount; |
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35 | |||
36 | /** |
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37 | * @param mixed $value |
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38 | */ |
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39 | public function __construct(int $column, $value, array $groups, float $impurity) |
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40 | { |
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41 | if (count($groups) !== 2) { |
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42 | throw new InvalidArgumentException('The number of groups must be exactly two.'); |
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43 | } |
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44 | |||
45 | if ($impurity < 0.) { |
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46 | throw new InvalidArgumentException('Impurity cannot be less than 0.'); |
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47 | } |
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48 | |||
49 | $this->column = $column; |
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50 | $this->value = $value; |
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51 | $this->groups = $groups; |
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52 | $this->impurity = $impurity; |
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53 | $this->samplesCount = (int) array_sum(array_map(function (array $group) { |
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54 | return count($group[0]); |
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55 | }, $groups)); |
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56 | } |
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57 | |||
58 | public function column(): int |
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59 | { |
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60 | return $this->column; |
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61 | } |
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62 | |||
63 | /** |
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64 | * @return mixed |
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65 | */ |
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66 | public function value() |
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67 | { |
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68 | return $this->value; |
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69 | } |
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70 | |||
71 | public function groups(): array |
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72 | { |
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73 | return $this->groups; |
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74 | } |
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75 | |||
76 | public function impurity(): float |
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77 | { |
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78 | return $this->impurity; |
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79 | } |
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80 | |||
81 | public function samplesCount(): int |
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82 | { |
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83 | return $this->samplesCount; |
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84 | } |
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85 | |||
86 | public function purityIncrease(): float |
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87 | { |
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88 | $impurity = $this->impurity; |
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89 | |||
90 | View Code Duplication | if ($this->left() instanceof PurityNode) { |
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0 ignored issues
–
show
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91 | $impurity -= $this->left()->impurity() |
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92 | * ($this->left()->samplesCount() / $this->samplesCount); |
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93 | } |
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94 | |||
95 | View Code Duplication | if ($this->right() instanceof PurityNode) { |
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0 ignored issues
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show
This code seems to be duplicated across your project.
Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository.
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96 | $impurity -= $this->right()->impurity() |
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97 | * ($this->right()->samplesCount() / $this->samplesCount); |
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98 | } |
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99 | |||
100 | return $impurity; |
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101 | } |
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102 | |||
103 | public function cleanup(): void |
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104 | { |
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105 | $this->groups = [[], []]; |
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106 | } |
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107 | } |
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108 |
Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation.
You can also find more detailed suggestions in the “Code” section of your repository.