Code Duplication    Length = 4-4 lines in 2 locations

src/Tree/Node/DecisionNode.php 2 locations

@@ 90-93 (lines=4) @@
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    {
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        $impurity = $this->impurity;
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        if ($this->left() instanceof PurityNode) {
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            $impurity -= $this->left()->impurity()
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                * ($this->left()->samplesCount() / $this->samplesCount);
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        }
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        if ($this->right() instanceof PurityNode) {
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            $impurity -= $this->right()->impurity()
@@ 95-98 (lines=4) @@
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                * ($this->left()->samplesCount() / $this->samplesCount);
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        }
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        if ($this->right() instanceof PurityNode) {
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            $impurity -= $this->right()->impurity()
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                * ($this->right()->samplesCount() / $this->samplesCount);
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        }
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        return $impurity;
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    }