无法运行PHP::SVM

Question

我尝试运行一个基本的支持向量机官方PHP::SVM教程中的示例，添加一些回波方法并打开错误报告：

<?php
error_reporting(E_ALL);
echo '1';
$data = array(
    array(-1, 1 => 0.43, 3 => 0.12, 9284 => 0.2),
    array(1, 1 => 0.22, 5 => 0.01, 94 => 0.11),
);
echo '2';
$svm = new SVM();
echo '3';
$model = $svm->train($data);
echo '4';
$data = array(1 => 0.43, 3 => 0.12, 9284 => 0.2);
$result = $model->predict($data);
var_dump($result);
$model->save('model.svm');
echo '5';
?>

在本地机器上运行此脚本将显示"12“。这条线有什么问题？

$svm = new SVM();

我该如何运行这个脚本？

Answer 1

它无法创建支持向量机类，大多数情况下是因为它没有安装。如果您尝试使用php-cli，您将得到以下错误：

PHP Fatal error:  Class 'SVM' not found in /tmp/svm.php on line 9

为了安装扩展程序(在Ubuntu12.04上)，我执行了以下操作：

# Install pear so we can get it from the common repo

$sudo apt-get install php-pear

#Install the headers for libsvm

$sudo apt-get install libsvm-dev

# Install the actual extension, I had to force it because it wasn't marked as stable

$sudo pecl install -f svm

#Then add the extension=svm.so line to the php.ini

$vi php.ini

# Now when you run it, you would get an actual output:

$php --php-ini ./php.ini svm.php

1234float(-1)
5