pla_test.php

<?php

$fact = array(10, -1);
$taringData = array();

for ($i = 0; $i < 50000; $i++)
{
    $x = rand(1, 10);
    $y = rand(1, 100);

    $source = ($x * $fact[0] + $y * $fact[1]) > 0 ? 1 : -1;
    $taringData[] = (object) array('data' => array($x, $y), 'return' => $source);
}


$weight = array(0, 0);
$update = 0;

t:

foreach ($taringData as $historyData)
{
    $historySource = $historyData->return;
    $historyTest   = $historyData->data;

    $getSource = 0;

    // 測試
    foreach ($historyTest as $testId => $test) {
        $getSource += $weight[$testId] * $test;
    }

    $getSource = $getSource > 0 ? 1 : -1;

    // 答錯
    if ($getSource != $historySource)
    {
        // 修正
        foreach ($historyTest as $testId => $test) {
            $weight[$testId] = $weight[$testId] + $test * $historySource;
        }

        $update++;

        // 重新考試
        goto t;
    }
}

print_r($update);
print_r($weight);

預到了個問題，如果我只有知道 x 跟 y ，接著用一條線畫分他們。
我算出的值，可能會是實質的值得倍率。