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Support for multiple training datasets (#38)
* Multiple training data sets allowed * Tests with multiple training data sets * Updating docs according to #38 Documenting all models which predictions will be based on all training data provided. Some models already supported multiple training data sets.
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@ -27,6 +27,8 @@ $associator = new Apriori($support = 0.5, $confidence = 0.5);
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$associator->train($samples, $labels);
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```
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You can train the associator using multiple data sets, predictions will be based on all the training data.
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### Predict
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To predict sample label use `predict` method. You can provide one sample or array of samples:
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@ -24,6 +24,8 @@ $classifier = new KNearestNeighbors();
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$classifier->train($samples, $labels);
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```
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You can train the classifier using multiple data sets, predictions will be based on all the training data.
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## Predict
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To predict sample label use `predict` method. You can provide one sample or array of samples:
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@ -14,6 +14,8 @@ $classifier = new NaiveBayes();
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$classifier->train($samples, $labels);
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```
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You can train the classifier using multiple data sets, predictions will be based on all the training data.
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### Predict
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To predict sample label use `predict` method. You can provide one sample or array of samples:
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@ -34,6 +34,8 @@ $classifier = new SVC(Kernel::LINEAR, $cost = 1000);
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$classifier->train($samples, $labels);
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```
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You can train the classifier using multiple data sets, predictions will be based on all the training data.
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### Predict
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To predict sample label use `predict` method. You can provide one sample or array of samples:
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@ -27,3 +27,4 @@ $training->train(
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$maxIteraions = 30000
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);
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```
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You can train the neural network using multiple data sets, predictions will be based on all the training data.
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@ -14,6 +14,8 @@ $regression = new LeastSquares();
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$regression->train($samples, $targets);
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```
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You can train the model using multiple data sets, predictions will be based on all the training data.
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### Predict
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To predict sample target value use `predict` method with sample to check (as `array`). Example:
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@ -34,6 +34,8 @@ $regression = new SVR(Kernel::LINEAR);
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$regression->train($samples, $targets);
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```
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You can train the model using multiple data sets, predictions will be based on all the training data.
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### Predict
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To predict sample target value use `predict` method. You can provide one sample or array of samples:
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@ -64,12 +64,13 @@ class DecisionTree implements Classifier
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*/
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public function train(array $samples, array $targets)
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{
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$this->featureCount = count($samples[0]);
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$this->columnTypes = $this->getColumnTypes($samples);
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$this->samples = $samples;
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$this->targets = $targets;
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$this->labels = array_keys(array_count_values($targets));
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$this->tree = $this->getSplitLeaf(range(0, count($samples) - 1));
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$this->samples = array_merge($this->samples, $samples);
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$this->targets = array_merge($this->targets, $targets);
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$this->featureCount = count($this->samples[0]);
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$this->columnTypes = $this->getColumnTypes($this->samples);
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$this->labels = array_keys(array_count_values($this->targets));
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$this->tree = $this->getSplitLeaf(range(0, count($this->samples) - 1));
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}
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protected function getColumnTypes(array $samples)
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@ -63,12 +63,12 @@ class NaiveBayes implements Classifier
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*/
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public function train(array $samples, array $targets)
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{
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$this->samples = $samples;
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$this->targets = $targets;
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$this->sampleCount = count($samples);
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$this->featureCount = count($samples[0]);
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$this->samples = array_merge($this->samples, $samples);
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$this->targets = array_merge($this->targets, $targets);
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$this->sampleCount = count($this->samples);
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$this->featureCount = count($this->samples[0]);
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$labelCounts = array_count_values($targets);
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$labelCounts = array_count_values($this->targets);
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$this->labels = array_keys($labelCounts);
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foreach ($this->labels as $label) {
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$samples = $this->getSamplesByLabel($label);
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@ -9,12 +9,12 @@ trait Trainable
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/**
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* @var array
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*/
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private $samples;
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private $samples = [];
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/**
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* @var array
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*/
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private $targets;
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private $targets = [];
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/**
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* @param array $samples
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@ -22,7 +22,7 @@ trait Trainable
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*/
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public function train(array $samples, array $targets)
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{
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$this->samples = $samples;
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$this->targets = $targets;
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$this->samples = array_merge($this->samples, $samples);
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$this->targets = array_merge($this->targets, $targets);
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}
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}
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@ -13,12 +13,12 @@ class LeastSquares implements Regression
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/**
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* @var array
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*/
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private $samples;
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private $samples = [];
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/**
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* @var array
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*/
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private $targets;
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private $targets = [];
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/**
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* @var float
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@ -36,8 +36,8 @@ class LeastSquares implements Regression
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*/
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public function train(array $samples, array $targets)
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{
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$this->samples = $samples;
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$this->targets = $targets;
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$this->samples = array_merge($this->samples, $samples);
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$this->targets = array_merge($this->targets, $targets);
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$this->computeCoefficients();
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}
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@ -8,7 +8,7 @@ use Phpml\Classification\DecisionTree;
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class DecisionTreeTest extends \PHPUnit_Framework_TestCase
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{
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public $data = [
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private $data = [
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['sunny', 85, 85, 'false', 'Dont_play' ],
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['sunny', 80, 90, 'true', 'Dont_play' ],
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['overcast', 83, 78, 'false', 'Play' ],
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@ -25,34 +25,39 @@ class DecisionTreeTest extends \PHPUnit_Framework_TestCase
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['rain', 71, 80, 'true', 'Dont_play' ]
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];
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public function getData()
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private $extraData = [
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['scorching', 90, 95, 'false', 'Dont_play'],
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['scorching', 100, 93, 'true', 'Dont_play'],
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];
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private function getData($input)
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{
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static $data = null, $targets = null;
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if ($data == null) {
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$data = $this->data;
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$targets = array_column($data, 4);
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array_walk($data, function (&$v) {
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array_splice($v, 4, 1);
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});
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}
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return [$data, $targets];
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$targets = array_column($input, 4);
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array_walk($input, function (&$v) {
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array_splice($v, 4, 1);
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});
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return [$input, $targets];
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}
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public function testPredictSingleSample()
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{
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list($data, $targets) = $this->getData();
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list($data, $targets) = $this->getData($this->data);
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$classifier = new DecisionTree(5);
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$classifier->train($data, $targets);
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$this->assertEquals('Dont_play', $classifier->predict(['sunny', 78, 72, 'false']));
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$this->assertEquals('Play', $classifier->predict(['overcast', 60, 60, 'false']));
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$this->assertEquals('Dont_play', $classifier->predict(['rain', 60, 60, 'true']));
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list($data, $targets) = $this->getData($this->extraData);
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$classifier->train($data, $targets);
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$this->assertEquals('Dont_play', $classifier->predict(['scorching', 95, 90, 'true']));
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$this->assertEquals('Play', $classifier->predict(['overcast', 60, 60, 'false']));
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return $classifier;
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}
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public function testTreeDepth()
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{
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list($data, $targets) = $this->getData();
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list($data, $targets) = $this->getData($this->data);
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$classifier = new DecisionTree(5);
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$classifier->train($data, $targets);
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$this->assertTrue(5 >= $classifier->actualDepth);
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@ -34,5 +34,15 @@ class NaiveBayesTest extends \PHPUnit_Framework_TestCase
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$predicted = $classifier->predict($testSamples);
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$this->assertEquals($testLabels, $predicted);
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// Feed an extra set of training data.
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$samples = [[1, 1, 6]];
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$labels = ['d'];
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$classifier->train($samples, $labels);
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$testSamples = [[1, 1, 6], [5, 1, 1]];
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$testLabels = ['d', 'a'];
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$this->assertEquals($testLabels, $classifier->predict($testSamples));
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}
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}
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