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Softmax calculation for PHP (useful for logistic classifications)
function softmax(array $v){
//Just in case values are passed in as string, apply floatval
$v = array_map('exp',array_map('floatval',$v));
$sum = array_sum($v);
foreach($v as $index => $value) {
$v[$index] = $value/$sum;
return $v;
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