php-ml/docs/machine-learning/metric/confusion-matrix.md
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# Confusion Matrix
Class for computing confusion matrix to evaluate the accuracy of a classification.
### Example (all targets)
Compute ConfusionMatrix for all targets.
```
use Phpml\Metric\ConfusionMatrix;
$actualTargets = [2, 0, 2, 2, 0, 1];
$predictedTargets = [0, 0, 2, 2, 0, 2];
$confusionMatrix = ConfusionMatrix::compute($actualTargets, $predictedTargets)
/*
$confusionMatrix = [
[2, 0, 0],
[0, 0, 1],
[1, 0, 2],
];
*/
```
### Example (chosen targets)
Compute ConfusionMatrix for chosen targets.
```
use Phpml\Metric\ConfusionMatrix;
$actualTargets = ['cat', 'ant', 'cat', 'cat', 'ant', 'bird'];
$predictedTargets = ['ant', 'ant', 'cat', 'cat', 'ant', 'cat'];
$confusionMatrix = ConfusionMatrix::compute($actualTargets, $predictedTargets, ['ant', 'bird'])
/*
$confusionMatrix = [
[2, 0],
[0, 0],
];
*/
```