php-ai /
php-ml
| @@ 83-98 (lines=16) @@ | ||
| 80 | } |
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| 81 | } |
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| 82 | ||
| 83 | private function normalizeL1(array &$sample) |
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| 84 | { |
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| 85 | $norm1 = 0; |
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| 86 | foreach ($sample as $feature) { |
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| 87 | $norm1 += abs($feature); |
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| 88 | } |
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| 89 | ||
| 90 | if (0 == $norm1) { |
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| 91 | $count = count($sample); |
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| 92 | $sample = array_fill(0, $count, 1.0 / $count); |
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| 93 | } else { |
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| 94 | foreach ($sample as &$feature) { |
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| 95 | $feature /= $norm1; |
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| 96 | } |
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| 97 | } |
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| 98 | } |
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| 99 | ||
| 100 | private function normalizeL2(array &$sample) |
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| 101 | { |
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| @@ 100-115 (lines=16) @@ | ||
| 97 | } |
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| 98 | } |
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| 99 | ||
| 100 | private function normalizeL2(array &$sample) |
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| 101 | { |
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| 102 | $norm2 = 0; |
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| 103 | foreach ($sample as $feature) { |
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| 104 | $norm2 += $feature * $feature; |
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| 105 | } |
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| 106 | $norm2 = sqrt((float) $norm2); |
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| 107 | ||
| 108 | if (0 == $norm2) { |
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| 109 | $sample = array_fill(0, count($sample), 1); |
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| 110 | } else { |
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| 111 | foreach ($sample as &$feature) { |
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| 112 | $feature /= $norm2; |
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| 113 | } |
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| 114 | } |
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| 115 | } |
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| 116 | ||
| 117 | private function normalizeSTD(array &$sample) |
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| 118 | { |
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