php-ai /
php-ml
| @@ 59-71 (lines=13) @@ | ||
| 56 | return $f; |
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| 57 | } |
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| 58 | ||
| 59 | private static function sumOfSquaresPerFeature(array $samples): array |
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| 60 | { |
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| 61 | $sum = array_fill(0, count($samples[0][0]), 0); |
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| 62 | foreach ($samples as $class) { |
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| 63 | foreach ($class as $sample) { |
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| 64 | foreach ($sample as $index => $feature) { |
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| 65 | $sum[$index] += $feature ** 2; |
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| 66 | } |
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| 67 | } |
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| 68 | } |
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| 69 | ||
| 70 | return $sum; |
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| 71 | } |
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| 72 | ||
| 73 | private static function sumOfFeaturesPerClass(array $samples): array |
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| 74 | { |
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| @@ 87-99 (lines=13) @@ | ||
| 84 | }, $samples); |
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| 85 | } |
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| 86 | ||
| 87 | private static function sumOfSquares(array $sums): array |
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| 88 | { |
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| 89 | $squares = array_fill(0, count($sums[0]), 0); |
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| 90 | foreach ($sums as $row) { |
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| 91 | foreach ($row as $index => $sum) { |
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| 92 | $squares[$index] += $sum; |
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| 93 | } |
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| 94 | } |
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| 95 | ||
| 96 | return array_map(function ($sum) { |
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| 97 | return $sum ** 2; |
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| 98 | }, $squares); |
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| 99 | } |
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| 100 | ||
| 101 | private static function squaresSum(array $sums): array |
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| 102 | { |
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