DecisionStump::getTrainingErrorRate() - Code Metrics - Inspection of "AdaBoost improvements (#53)" - php-ai/php-ml - Measure and Improve Code Quality continuously with Scrutinizer

Test Failed

Push — master ( e8c600...c028a7 )

by Arkadiusz

created 2017-02-28 20:45 UTC

DecisionStump::getTrainingErrorRate() A

↳ Parent: DecisionStump::train()

Complexity

Conditions	1
Paths	1

Size

Total Lines	4
Code Lines	2

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
dl	0
loc	4
rs	10
c	0
b	0
f	0
cc	1
eloc	2
nc	1
nop	0

<?php

declare(strict_types=1);

namespace Phpml\Classification\Linear;

use Phpml\Helper\Predictable;
use Phpml\Helper\Trainable;
use Phpml\Classification\WeightedClassifier;
use Phpml\Classification\DecisionTree;

class DecisionStump extends WeightedClassifier
{
    use Trainable, Predictable;

    const AUTO_SELECT = -1;

    /**
     * @var int
     */
    protected $givenColumnIndex;


    /**
     * Sample weights : If used the optimization on the decision value
     * will take these weights into account. If not given, all samples
     * will be weighed with the same value of 1
     *
     * @var array
     */
    protected $weights = null;

    /**
     * Lowest error rate obtained while training/optimizing the model
     *
     * @var float
     */
    protected $trainingErrorRate;

    /**
     * @var int
     */
    protected $column;

    /**
     * @var mixed
     */
    protected $value;

    /**
     * @var string
     */
    protected $operator;

    /**
     * @var array
     */
    protected $columnTypes;

    /**
     * @var float
     */
    protected $numSplitCount = 10.0;

    /**
     * A DecisionStump classifier is a one-level deep DecisionTree. It is generally
     * used with ensemble algorithms as in the weak classifier role. <br>
     *
     * If columnIndex is given, then the stump tries to produce a decision node
     * on this column, otherwise in cases given the value of -1, the stump itself
     * decides which column to take for the decision (Default DecisionTree behaviour)
     *
     * @param int $columnIndex
     */
    public function __construct(int $columnIndex = self::AUTO_SELECT)
    {
        $this->givenColumnIndex = $columnIndex;
    }

    /**
     * @param array $samples
     * @param array $targets
     */
    public function train(array $samples, array $targets)
    {
        $this->samples = array_merge($this->samples, $samples);
        $this->targets = array_merge($this->targets, $targets);

        // DecisionStump is capable of classifying between two classes only
        $labels = array_count_values($this->targets);
        $this->labels = array_keys($labels);
class MyClass { }

$x = new MyClass();
$x->foo = true;
        if (count($this->labels) != 2) {
            throw new \Exception("DecisionStump can classify between two classes only:" . implode(',', $this->labels));
        }

        // If a column index is given, it should be among the existing columns
        if ($this->givenColumnIndex > count($samples[0]) - 1) {
            $this->givenColumnIndex = self::AUTO_SELECT;
        }

        // Check the size of the weights given.
        // If none given, then assign 1 as a weight to each sample
        if ($this->weights) {

            $numWeights = count($this->weights);
            if ($numWeights != count($this->samples)) {
                throw new \Exception("Number of sample weights does not match with number of samples");
            }
        } else {
            $this->weights = array_fill(0, count($samples), 1);
        }

        // Determine type of each column as either "continuous" or "nominal"
        $this->columnTypes = DecisionTree::getColumnTypes($this->samples);

        // Try to find the best split in the columns of the dataset
        // by calculating error rate for each split point in each column
        $columns = range(0, count($samples[0]) - 1);
        if ($this->givenColumnIndex != self::AUTO_SELECT) {
            $columns = [$this->givenColumnIndex];
        }

        $bestSplit = [
            'value' => 0, 'operator' => '',
            'column' => 0, 'trainingErrorRate' => 1.0];
        foreach ($columns as $col) {
            if ($this->columnTypes[$col] == DecisionTree::CONTINUOS) {
                $split = $this->getBestNumericalSplit($col);
            } else {
                $split = $this->getBestNominalSplit($col);
            }

            if ($split['trainingErrorRate'] < $bestSplit['trainingErrorRate']) {
                $bestSplit = $split;
            }
        }

        // Assign determined best values to the stump
        foreach ($bestSplit as $name => $value) {
            $this->{$name} = $value;
        }
    }

    /**
     * While finding best split point for a numerical valued column,
     * DecisionStump looks for equally distanced values between minimum and maximum
     * values in the column. Given <i>$count</i> value determines how many split
     * points to be probed. The more split counts, the better performance but
     * worse processing time (Default value is 10.0)
     *
     * @param float $count
     */
    public function setNumericalSplitCount(float $count)
    {
        $this->numSplitCount = $count;
    }

    /**
     * Determines best split point for the given column
     *
     * @param int $col
     *
     * @return array
     */
    protected function getBestNumericalSplit(int $col)
    {
        $values = array_column($this->samples, $col);
        $minValue = min($values);
        $maxValue = max($values);
        $stepSize = ($maxValue - $minValue) / $this->numSplitCount;

        $split = null;

        foreach (['<=', '>'] as $operator) {
            // Before trying all possible split points, let's first try
            // the average value for the cut point
            $threshold = array_sum($values) / (float) count($values);
            $errorRate = $this->calculateErrorRate($threshold, $operator, $values);
            if ($split == null || $errorRate < $split['trainingErrorRate']) {

                $split = ['value' => $threshold, 'operator' => $operator,
                        'column' => $col, 'trainingErrorRate' => $errorRate];
            }

            // Try other possible points one by one
            for ($step = $minValue; $step <= $maxValue; $step+= $stepSize) {
                $threshold = (float)$step;
                $errorRate = $this->calculateErrorRate($threshold, $operator, $values);
                if ($errorRate < $split['trainingErrorRate']) {

                    $split = ['value' => $threshold, 'operator' => $operator,
                        'column' => $col, 'trainingErrorRate' => $errorRate];
                }
            }// for
        }

        return $split;
    }

    /**
     *
     * @param int $col
     *
     * @return array
     */
    protected function getBestNominalSplit(int $col)
    {
        $values = array_column($this->samples, $col);
        $valueCounts = array_count_values($values);
        $distinctVals= array_keys($valueCounts);

        $split = null;

        foreach (['=', '!='] as $operator) {
            foreach ($distinctVals as $val) {
                $errorRate = $this->calculateErrorRate($val, $operator, $values);

                if ($split == null || $split['trainingErrorRate'] < $errorRate) {

                    $split = ['value' => $val, 'operator' => $operator,
                        'column' => $col, 'trainingErrorRate' => $errorRate];
                }
            }// for
        }

        return $split;
    }


    /**
     *
     * @param type $leftValue
     * @param type $operator
     * @param type $rightValue
     *
     * @return boolean
     */
    protected function evaluate($leftValue, $operator, $rightValue)
    {
        switch ($operator) {
            case '>': return $leftValue > $rightValue;
switch ($expr) {
case "A":
    doSomething(); //right
    break;
case "B":

    doSomethingElse(); //wrong
    break;
            case '>=': return $leftValue >= $rightValue;
switch ($expr) {
case "A":
    doSomething(); //right
    break;
case "B":

    doSomethingElse(); //wrong
    break;
            case '<': return $leftValue < $rightValue;
switch ($expr) {
case "A":
    doSomething(); //right
    break;
case "B":

    doSomethingElse(); //wrong
    break;
            case '<=': return $leftValue <= $rightValue;
switch ($expr) {
case "A":
    doSomething(); //right
    break;
case "B":

    doSomethingElse(); //wrong
    break;
            case '=': return $leftValue == $rightValue;
switch ($expr) {
case "A":
    doSomething(); //right
    break;
case "B":

    doSomethingElse(); //wrong
    break;
            case '!=':
            case '<>': return $leftValue != $rightValue;
switch ($expr) {
case "A":
    doSomething(); //right
    break;
case "B":

    doSomethingElse(); //wrong
    break;
        }

        return false;
    }

    /**
     * Calculates the ratio of wrong predictions based on the new threshold
     * value given as the parameter
     *
     * @param float $threshold
     * @param string $operator
     * @param array $values
     */
    protected function calculateErrorRate(float $threshold, string $operator, array $values)
    {
        $total = (float) array_sum($this->weights);
        $wrong = 0.0;
        $leftLabel = $this->labels[0];
        $rightLabel= $this->labels[1];
        foreach ($values as $index => $value) {
            if ($this->evaluate($threshold, $operator, $value)) {
function acceptsInteger($int) { }

$x = '123'; // string "123"

// Instead of
acceptsInteger($x);

// we recommend to use
acceptsInteger((integer) $x);
                $predicted = $leftLabel;
            } else {
                $predicted = $rightLabel;
            }

            if ($predicted != $this->targets[$index]) {
                $wrong += $this->weights[$index];
            }
        }

        return $wrong / $total;
    }

    /**
     * @param array $sample
     * @return mixed
     */
    protected function predictSample(array $sample)
    {
        if ($this->evaluate($this->value, $this->operator, $sample[$this->column])) {
function acceptsInteger($int) { }

$x = '123'; // string "123"

// Instead of
acceptsInteger($x);

// we recommend to use
acceptsInteger((integer) $x);
            return $this->labels[0];
        }
        return $this->labels[1];
    }

    public function __toString()
    {
        return "$this->column $this->operator $this->value";
    }
}


1		<?php
2
3		declare(strict_types=1);
4
5		namespace Phpml\Classification\Linear;
6
7		use Phpml\Helper\Predictable;
8		use Phpml\Helper\Trainable;
9		use Phpml\Classification\WeightedClassifier;
10		use Phpml\Classification\DecisionTree;
11
12		class DecisionStump extends WeightedClassifier
13		{
14		use Trainable, Predictable;
15
16		const AUTO_SELECT = -1;
17
18		/**
19		* @var int
20		*/
21		protected $givenColumnIndex;
22
23
24		/**
25		* Sample weights : If used the optimization on the decision value
26		* will take these weights into account. If not given, all samples
27		* will be weighed with the same value of 1
28		*
29		* @var array
30		*/
31		protected $weights = null;
32
33		/**
34		* Lowest error rate obtained while training/optimizing the model
35		*
36		* @var float
37		*/
38		protected $trainingErrorRate;
39
40		/**
41		* @var int
42		*/
43		protected $column;
44
45		/**
46		* @var mixed
47		*/
48		protected $value;
49
50		/**
51		* @var string
52		*/
53		protected $operator;
54
55		/**
56		* @var array
57		*/
58		protected $columnTypes;
59
60		/**
61		* @var float
62		*/
63		protected $numSplitCount = 10.0;
64
65		/**
66		* A DecisionStump classifier is a one-level deep DecisionTree. It is generally
67		* used with ensemble algorithms as in the weak classifier role. <br>
68		*
69		* If columnIndex is given, then the stump tries to produce a decision node
70		* on this column, otherwise in cases given the value of -1, the stump itself
71		* decides which column to take for the decision (Default DecisionTree behaviour)
72		*
73		* @param int $columnIndex
74		*/
75		public function __construct(int $columnIndex = self::AUTO_SELECT)
76		{
77		$this->givenColumnIndex = $columnIndex;
78		}
79
80		/**
81		* @param array $samples
82		* @param array $targets
83		*/
84		public function train(array $samples, array $targets)
85		{
86		$this->samples = array_merge($this->samples, $samples);
87		$this->targets = array_merge($this->targets, $targets);
88
89		// DecisionStump is capable of classifying between two classes only
90		$labels = array_count_values($this->targets);
91		$this->labels = array_keys($labels);
		0 ignored issues – show Bug introduced 2017-02-25 14:37 UTC by Report Bug Copy Issue Report The property `labels` does not exist. Did you maybe forget to declare it? In PHP it is possible to write to properties without declaring them. For example, the following is perfectly valid PHP code: class MyClass { } $x = new MyClass(); $x->foo = true; Generally, it is a good practice to explictly declare properties to avoid accidental typos and provide IDE auto-completion: class MyClass { public $foo; } $x = new MyClass(); $x->foo = true; Loading history...
92		if (count($this->labels) != 2) {
93		throw new \Exception("DecisionStump can classify between two classes only:" . implode(',', $this->labels));
94		}
95
96		// If a column index is given, it should be among the existing columns
97		if ($this->givenColumnIndex > count($samples[0]) - 1) {
98		$this->givenColumnIndex = self::AUTO_SELECT;
99		}
100
101		// Check the size of the weights given.
102		// If none given, then assign 1 as a weight to each sample
103		if ($this->weights) {
		0 ignored issues – show Bug Best Practice introduced 2017-02-19 10:47 UTC by Report Bug Copy Issue Report The expression `$this->weights` of type `array` is implicitly converted to a boolean; are you sure this is intended? If so, consider using `! empty($expr)` instead to make it clear that you intend to check for an array without elements. This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent. Consider making the comparison explicit by using `empty(..)` or `! empty(...)` instead. Loading history...
104		$numWeights = count($this->weights);
105		if ($numWeights != count($this->samples)) {
106		throw new \Exception("Number of sample weights does not match with number of samples");
107		}
108		} else {
109		$this->weights = array_fill(0, count($samples), 1);
110		}
111
112		// Determine type of each column as either "continuous" or "nominal"
113		$this->columnTypes = DecisionTree::getColumnTypes($this->samples);
114
115		// Try to find the best split in the columns of the dataset
116		// by calculating error rate for each split point in each column
117		$columns = range(0, count($samples[0]) - 1);
118		if ($this->givenColumnIndex != self::AUTO_SELECT) {
119		$columns = [$this->givenColumnIndex];
120		}
121
122		$bestSplit = [
123		'value' => 0, 'operator' => '',
124		'column' => 0, 'trainingErrorRate' => 1.0];
125		foreach ($columns as $col) {
126		if ($this->columnTypes[$col] == DecisionTree::CONTINUOS) {
127		$split = $this->getBestNumericalSplit($col);
128		} else {
129		$split = $this->getBestNominalSplit($col);
130		}
131
132		if ($split['trainingErrorRate'] < $bestSplit['trainingErrorRate']) {
133		$bestSplit = $split;
134		}
135		}
136
137		// Assign determined best values to the stump
138		foreach ($bestSplit as $name => $value) {
139		$this->{$name} = $value;
140		}
141		}
142
143		/**
144		* While finding best split point for a numerical valued column,
145		* DecisionStump looks for equally distanced values between minimum and maximum
146		* values in the column. Given <i>$count</i> value determines how many split
147		* points to be probed. The more split counts, the better performance but
148		* worse processing time (Default value is 10.0)
149		*
150		* @param float $count
151		*/
152		public function setNumericalSplitCount(float $count)
153		{
154		$this->numSplitCount = $count;
155		}
156
157		/**
158		* Determines best split point for the given column
159		*
160		* @param int $col
161		*
162		* @return array
163		*/
164		protected function getBestNumericalSplit(int $col)
165		{
166		$values = array_column($this->samples, $col);
167		$minValue = min($values);
168		$maxValue = max($values);
169		$stepSize = ($maxValue - $minValue) / $this->numSplitCount;
170
171		$split = null;
172
173		foreach (['<=', '>'] as $operator) {
174		// Before trying all possible split points, let's first try
175		// the average value for the cut point
176		$threshold = array_sum($values) / (float) count($values);
177		$errorRate = $this->calculateErrorRate($threshold, $operator, $values);
178	View Code Duplication	if ($split == null \|\| $errorRate < $split['trainingErrorRate']) {
		0 ignored issues – show Duplication introduced 2017-02-25 14:37 UTC by Report Bug Copy Issue Report This code seems to be duplicated across your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
179		$split = ['value' => $threshold, 'operator' => $operator,
180		'column' => $col, 'trainingErrorRate' => $errorRate];
181		}
182
183		// Try other possible points one by one
184		for ($step = $minValue; $step <= $maxValue; $step+= $stepSize) {
185		$threshold = (float)$step;
186		$errorRate = $this->calculateErrorRate($threshold, $operator, $values);
187	View Code Duplication	if ($errorRate < $split['trainingErrorRate']) {
		0 ignored issues – show Duplication introduced 2017-02-25 14:37 UTC by Report Bug Copy Issue Report This code seems to be duplicated across your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
188		$split = ['value' => $threshold, 'operator' => $operator,
189		'column' => $col, 'trainingErrorRate' => $errorRate];
190		}
191		}// for
192		}
193
194		return $split;
195		}
196
197		/**
198		*
199		* @param int $col
200		*
201		* @return array
202		*/
203		protected function getBestNominalSplit(int $col)
204		{
205		$values = array_column($this->samples, $col);
206		$valueCounts = array_count_values($values);
207		$distinctVals= array_keys($valueCounts);
208
209		$split = null;
210
211		foreach (['=', '!='] as $operator) {
212		foreach ($distinctVals as $val) {
213		$errorRate = $this->calculateErrorRate($val, $operator, $values);
214
215	View Code Duplication	if ($split == null \|\| $split['trainingErrorRate'] < $errorRate) {
		0 ignored issues – show Duplication introduced 2017-02-25 14:37 UTC by Report Bug Copy Issue Report This code seems to be duplicated across your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
216		$split = ['value' => $val, 'operator' => $operator,
217		'column' => $col, 'trainingErrorRate' => $errorRate];
218		}
219		}// for
220		}
221
222		return $split;
223		}
224
225
226		/**
227		*
228		* @param type $leftValue
229		* @param type $operator
230		* @param type $rightValue
231		*
232		* @return boolean
233		*/
234		protected function evaluate($leftValue, $operator, $rightValue)
235		{
236		switch ($operator) {
237		case '>': return $leftValue > $rightValue;
		0 ignored issues – show Coding Style introduced 2017-02-27 13:38 UTC by Report Bug Copy Issue Report The case body in a switch statement must start on the line following the statement. According to the PSR-2, the body of a case statement must start on the line immediately following the case statement. switch ($expr) { case "A": doSomething(); //right break; case "B": doSomethingElse(); //wrong break; } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history... Coding Style introduced 2017-02-27 13:38 UTC by Report Bug Copy Issue Report Terminating statement must be on a line by itself As per the PSR-2 coding standard, the `break` (or other terminating) statement must be on a line of its own. switch ($expr) { case "A": doSomething(); break; //wrong case "B": doSomething(); break; //right case "C:": doSomething(); return true; //right } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history...
238		case '>=': return $leftValue >= $rightValue;
		0 ignored issues – show Coding Style introduced 2017-02-27 13:38 UTC by Report Bug Copy Issue Report The case body in a switch statement must start on the line following the statement. According to the PSR-2, the body of a case statement must start on the line immediately following the case statement. switch ($expr) { case "A": doSomething(); //right break; case "B": doSomethingElse(); //wrong break; } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history... Coding Style introduced 2017-02-27 13:38 UTC by Report Bug Copy Issue Report Terminating statement must be on a line by itself As per the PSR-2 coding standard, the `break` (or other terminating) statement must be on a line of its own. switch ($expr) { case "A": doSomething(); break; //wrong case "B": doSomething(); break; //right case "C:": doSomething(); return true; //right } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history...
239		case '<': return $leftValue < $rightValue;
		0 ignored issues – show Coding Style introduced 2017-02-27 13:38 UTC by Report Bug Copy Issue Report The case body in a switch statement must start on the line following the statement. According to the PSR-2, the body of a case statement must start on the line immediately following the case statement. switch ($expr) { case "A": doSomething(); //right break; case "B": doSomethingElse(); //wrong break; } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history... Coding Style introduced 2017-02-27 13:38 UTC by Report Bug Copy Issue Report Terminating statement must be on a line by itself As per the PSR-2 coding standard, the `break` (or other terminating) statement must be on a line of its own. switch ($expr) { case "A": doSomething(); break; //wrong case "B": doSomething(); break; //right case "C:": doSomething(); return true; //right } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history...
240		case '<=': return $leftValue <= $rightValue;
		0 ignored issues – show Coding Style introduced 2017-02-27 13:38 UTC by Report Bug Copy Issue Report The case body in a switch statement must start on the line following the statement. According to the PSR-2, the body of a case statement must start on the line immediately following the case statement. switch ($expr) { case "A": doSomething(); //right break; case "B": doSomethingElse(); //wrong break; } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history... Coding Style introduced 2017-02-27 13:38 UTC by Report Bug Copy Issue Report Terminating statement must be on a line by itself As per the PSR-2 coding standard, the `break` (or other terminating) statement must be on a line of its own. switch ($expr) { case "A": doSomething(); break; //wrong case "B": doSomething(); break; //right case "C:": doSomething(); return true; //right } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history...
241		case '=': return $leftValue == $rightValue;
		0 ignored issues – show Coding Style introduced 2017-02-27 13:38 UTC by Report Bug Copy Issue Report The case body in a switch statement must start on the line following the statement. According to the PSR-2, the body of a case statement must start on the line immediately following the case statement. switch ($expr) { case "A": doSomething(); //right break; case "B": doSomethingElse(); //wrong break; } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history... Coding Style introduced 2017-02-27 13:38 UTC by Report Bug Copy Issue Report Terminating statement must be on a line by itself As per the PSR-2 coding standard, the `break` (or other terminating) statement must be on a line of its own. switch ($expr) { case "A": doSomething(); break; //wrong case "B": doSomething(); break; //right case "C:": doSomething(); return true; //right } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history...
242		case '!=':
243		case '<>': return $leftValue != $rightValue;
		0 ignored issues – show Coding Style introduced 2017-02-27 13:38 UTC by Report Bug Copy Issue Report The case body in a switch statement must start on the line following the statement. According to the PSR-2, the body of a case statement must start on the line immediately following the case statement. switch ($expr) { case "A": doSomething(); //right break; case "B": doSomethingElse(); //wrong break; } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history... Coding Style introduced 2017-02-27 13:38 UTC by Report Bug Copy Issue Report Terminating statement must be on a line by itself As per the PSR-2 coding standard, the `break` (or other terminating) statement must be on a line of its own. switch ($expr) { case "A": doSomething(); break; //wrong case "B": doSomething(); break; //right case "C:": doSomething(); return true; //right } To learn more about the PSR-2 coding standard, please refer to the PHP-Fig. Loading history...
244		}
245
246		return false;
247		}
248
249		/**
250		* Calculates the ratio of wrong predictions based on the new threshold
251		* value given as the parameter
252		*
253		* @param float $threshold
254		* @param string $operator
255		* @param array $values
256		*/
257		protected function calculateErrorRate(float $threshold, string $operator, array $values)
258		{
259		$total = (float) array_sum($this->weights);
260		$wrong = 0.0;
261		$leftLabel = $this->labels[0];
262		$rightLabel= $this->labels[1];
263		foreach ($values as $index => $value) {
264		if ($this->evaluate($threshold, $operator, $value)) {
		0 ignored issues – show Documentation introduced 2017-02-25 14:37 UTC by Report Bug Copy Issue Report `$threshold` is of type `double`, but the function expects a `object<Phpml\Classification\Linear\type>`. It seems like the type of the argument is not accepted by the function/method which you are calling. In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug. We suggest to add an explicit type cast like in the following example: function acceptsInteger($int) { } $x = '123'; // string "123" // Instead of acceptsInteger($x); // we recommend to use acceptsInteger((integer) $x); Loading history... Documentation introduced 2017-02-25 14:37 UTC by Report Bug Copy Issue Report `$operator` is of type `string`, but the function expects a `object<Phpml\Classification\Linear\type>`. It seems like the type of the argument is not accepted by the function/method which you are calling. In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug. We suggest to add an explicit type cast like in the following example: function acceptsInteger($int) { } $x = '123'; // string "123" // Instead of acceptsInteger($x); // we recommend to use acceptsInteger((integer) $x); Loading history...
265		$predicted = $leftLabel;
266		} else {
267		$predicted = $rightLabel;
268		}
269
270		if ($predicted != $this->targets[$index]) {
271		$wrong += $this->weights[$index];
272		}
273		}
274
275		return $wrong / $total;
276		}
277
278		/**
279		* @param array $sample
280		* @return mixed
281		*/
282		protected function predictSample(array $sample)
283		{
284		if ($this->evaluate($this->value, $this->operator, $sample[$this->column])) {
		0 ignored issues – show Documentation introduced 2017-02-25 14:37 UTC by Report Bug Copy Issue Report `$this->operator` is of type `string`, but the function expects a `object<Phpml\Classification\Linear\type>`. It seems like the type of the argument is not accepted by the function/method which you are calling. In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug. We suggest to add an explicit type cast like in the following example: function acceptsInteger($int) { } $x = '123'; // string "123" // Instead of acceptsInteger($x); // we recommend to use acceptsInteger((integer) $x); Loading history...
285		return $this->labels[0];
286		}
287		return $this->labels[1];
288		}
289
290		public function __toString()
291		{
292		return "$this->column $this->operator $this->value";
293		}
294		}
295

php-ai / php-ml

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DecisionStump::getTrainingErrorRate() A

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