TfIdfTransformer::fit() - Code Metrics - Inspection of "php-cs-fixer" - php-ai/php-ml - Measure and Improve Code Quality continuously with Scrutinizer

Completed

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by Arkadiusz

created 2016-06-16 22:34 UTC

TfIdfTransformer::fit() A

↳ Parent: TfIdfTransformer

Complexity

Conditions	2
Paths	2

Size

Total Lines	9
Code Lines	5

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	1

Metric	Value
c	1
b	0
f	1
dl	0
loc	9
rs	9.6666
cc	2
eloc	5
nc	2
nop	1

<?php

declare (strict_types = 1);

namespace Phpml\FeatureExtraction;

use Phpml\Transformer;

class TfIdfTransformer implements Transformer
{
    /**
     * @var array
     */
    private $idf;

    /**
     * @param array $samples
     */
    public function __construct(array $samples = null)
    {
        if ($samples) {
            $this->fit($samples);
        }
    }

    /**
     * @param array $samples
     */
    public function fit(array $samples)
    {
        $this->countTokensFrequency($samples);

        $count = count($samples);
        foreach ($this->idf as &$value) {
            $value = log($count / $value, 10);
        }
    }

    /**
     * @param array $samples
     */
    public function transform(array &$samples)
    {
        foreach ($samples as &$sample) {
            foreach ($sample as $index => &$feature) {
                $feature = $feature * $this->idf[$index];
            }
        }
    }

    /**
     * @param array $samples
     *
     * @return array
     */
    private function countTokensFrequency(array $samples)
    {
        $this->idf = array_fill_keys(array_keys($samples[0]), 0);

        foreach ($samples as $sample) {
            foreach ($sample as $index => $count) {
                if ($count > 0) {
                    ++$this->idf[$index];
                }
            }
        }
    }
}


1			<?php
2
3			declare (strict_types = 1);
4
5			namespace Phpml\FeatureExtraction;
6
7			use Phpml\Transformer;
8
9			class TfIdfTransformer implements Transformer
10			{
11			/**
12			* @var array
13			*/
14			private $idf;
15
16			/**
17			* @param array $samples
18			*/
19			public function __construct(array $samples = null)
20			{
21			if ($samples) {
22			$this->fit($samples);
23			}
24			}
25
26			/**
27			* @param array $samples
28			*/
29			public function fit(array $samples)
30			{
31			$this->countTokensFrequency($samples);
32
33			$count = count($samples);
34			foreach ($this->idf as &$value) {
35			$value = log($count / $value, 10);
36			}
37			}
38
39			/**
40			* @param array $samples
41			*/
42			public function transform(array &$samples)
43			{
44			foreach ($samples as &$sample) {
45			foreach ($sample as $index => &$feature) {
46			$feature = $feature * $this->idf[$index];
47			}
48			}
49			}
50
51			/**
52			* @param array $samples
53			*
54			* @return array
55			*/
56			private function countTokensFrequency(array $samples)
57			{
58			$this->idf = array_fill_keys(array_keys($samples[0]), 0);
59
60			foreach ($samples as $sample) {
61			foreach ($sample as $index => $count) {
62			if ($count > 0) {
63			++$this->idf[$index];
64			}
65			}
66			}
67			}
68			}
69

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TfIdfTransformer::fit() A

Complexity

Size

Duplication

Importance

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