PHP code example of medansoftware / c45-algorithm-php

1. Go to this page and download the library: Download medansoftware/c45-algorithm-php library. Choose the download type require.

2. Extract the ZIP file and open the index.php.

3. Add this code to the index.php. 
    
        
<?php
require_once('vendor/autoload.php');

/* Start to develop here. Best regards https://php-download.com/ */

medansoftware / c45-algorithm-php example snippets


$c45 = new Algorithm\C45('examples/example.xlsx', 'PLAY');

$tree = $c45->initialize()->buildTree();

echo $tree->toString();


$c45 = new Algorithm\C45();
$c45->loadFile('examples/example.xlsx');
$c45->setTargetAttribute('PLAY');

$tree = $c45->initialize()->buildTree();

echo $tree->toString();


$data = [
    ['OUTLOOK' => 'Sunny',  'TEMPERATURE' => 'Hot',  'HUMIDITY' => 'High',   'WINDY' => 'False', 'PLAY' => 'No'],
    ['OUTLOOK' => 'Sunny',  'TEMPERATURE' => 'Hot',  'HUMIDITY' => 'High',   'WINDY' => 'True',  'PLAY' => 'No'],
    ['OUTLOOK' => 'Cloudy', 'TEMPERATURE' => 'Hot',  'HUMIDITY' => 'High',   'WINDY' => 'False', 'PLAY' => 'Yes'],
    ['OUTLOOK' => 'Rainy',  'TEMPERATURE' => 'Mild', 'HUMIDITY' => 'High',   'WINDY' => 'False', 'PLAY' => 'Yes'],
    ['OUTLOOK' => 'Rainy',  'TEMPERATURE' => 'Cool', 'HUMIDITY' => 'Normal', 'WINDY' => 'False', 'PLAY' => 'Yes'],
    ['OUTLOOK' => 'Rainy',  'TEMPERATURE' => 'Cool', 'HUMIDITY' => 'Normal', 'WINDY' => 'True',  'PLAY' => 'No'],
    ['OUTLOOK' => 'Cloudy', 'TEMPERATURE' => 'Cool', 'HUMIDITY' => 'Normal', 'WINDY' => 'True',  'PLAY' => 'Yes'],
    ['OUTLOOK' => 'Sunny',  'TEMPERATURE' => 'Mild', 'HUMIDITY' => 'High',   'WINDY' => 'False', 'PLAY' => 'No'],
    ['OUTLOOK' => 'Sunny',  'TEMPERATURE' => 'Cool', 'HUMIDITY' => 'Normal', 'WINDY' => 'False', 'PLAY' => 'Yes'],
    ['OUTLOOK' => 'Rainy',  'TEMPERATURE' => 'Mild', 'HUMIDITY' => 'Normal', 'WINDY' => 'False', 'PLAY' => 'Yes'],
    ['OUTLOOK' => 'Sunny',  'TEMPERATURE' => 'Mild', 'HUMIDITY' => 'Normal', 'WINDY' => 'True',  'PLAY' => 'Yes'],
    ['OUTLOOK' => 'Cloudy', 'TEMPERATURE' => 'Mild', 'HUMIDITY' => 'High',   'WINDY' => 'True',  'PLAY' => 'Yes'],
    ['OUTLOOK' => 'Cloudy', 'TEMPERATURE' => 'Hot',  'HUMIDITY' => 'Normal', 'WINDY' => 'False', 'PLAY' => 'Yes'],
    ['OUTLOOK' => 'Rainy',  'TEMPERATURE' => 'Mild', 'HUMIDITY' => 'High',   'WINDY' => 'True',  'PLAY' => 'No'],
];

$input = new Algorithm\C45\DataInput();
$input->setData($data);
$input->setAttributes(['OUTLOOK', 'TEMPERATURE', 'HUMIDITY', 'WINDY', 'PLAY']);

$c45 = new Algorithm\C45();
$c45->c45 = $input;
$c45->setTargetAttribute('PLAY');

$tree = $c45->initialize()->buildTree();

echo $tree->toString();


$input = new Algorithm\C45\DataInput();
$input->loadCsv('example.csv'); // delimiter defaults to ','

$c45 = new Algorithm\C45();
$c45->c45 = $input;
$c45->setTargetAttribute('PLAY');

$tree = $c45->initialize()->buildTree();

echo $tree->toString();


$newData = [
    'OUTLOOK'     => 'Sunny',
    'TEMPERATURE' => 'Hot',
    'HUMIDITY'    => 'High',
    'WINDY'       => 'False',
];

echo $tree->classify($newData); // "No"


$newData = [
    'TEMPERATURE' => 'Hot',
    'HUMIDITY'    => 'High',
    'WINDY'       => 'False',
    // OUTLOOK is missing
];

echo $tree->classify($newData);


$result = $c45->evaluate($tree, $testData);

echo $result['accuracy'];          // e.g. 0.86
echo $result['correct'] . '/' . $result['total'];
print_r($result['misclassified']);


[
    'accuracy'      => 0.86,
    'correct'       => 86,
    'total'         => 100,
    'misclassified' => [
        // rows that were classified incorrectly
    ],
]


echo $tree->toString();


echo $tree->toJson();


print_r($tree->toArray());


file_put_contents('tree.dot', $tree->toDot());

bash
> composer 
bash
composer 
text
.
├── .github/
│   └── workflows/
│       └── tests.yml
├── examples/
│   ├── example.xlsx
│   ├── tree.dot
│   └── tree.png
├── src/
│   ├── C45.php
│   └── C45/
│       ├── Calculator/
│       ├── DataInput/
│       ├── DataInput.php
│       └── TreeNode.php
├── tests/
├── composer.json
├── phpunit.xml
├── CHANGELOG.md
└── LICENSE