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1 | <?php |
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2 | |||
3 | declare(strict_types=1); |
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4 | |||
5 | namespace Phpml\SupportVectorMachine; |
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6 | |||
7 | use Phpml\Exception\InvalidArgumentException; |
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8 | use Phpml\Exception\LibsvmCommandException; |
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9 | use Phpml\Helper\Trainable; |
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10 | |||
11 | class SupportVectorMachine |
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12 | { |
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13 | use Trainable; |
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14 | |||
15 | /** |
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16 | * @var int |
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17 | */ |
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18 | private $type; |
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19 | |||
20 | /** |
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21 | * @var int |
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22 | */ |
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23 | private $kernel; |
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24 | |||
25 | /** |
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26 | * @var float |
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27 | */ |
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28 | private $cost; |
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29 | |||
30 | /** |
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31 | * @var float |
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32 | */ |
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33 | private $nu; |
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34 | |||
35 | /** |
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36 | * @var int |
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37 | */ |
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38 | private $degree; |
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39 | |||
40 | /** |
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41 | * @var float|null |
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42 | */ |
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43 | private $gamma; |
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44 | |||
45 | /** |
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46 | * @var float |
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47 | */ |
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48 | private $coef0; |
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49 | |||
50 | /** |
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51 | * @var float |
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52 | */ |
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53 | private $epsilon; |
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54 | |||
55 | /** |
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56 | * @var float |
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57 | */ |
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58 | private $tolerance; |
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59 | |||
60 | /** |
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61 | * @var int |
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62 | */ |
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63 | private $cacheSize; |
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64 | |||
65 | /** |
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66 | * @var bool |
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67 | */ |
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68 | private $shrinking; |
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69 | |||
70 | /** |
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71 | * @var bool |
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72 | */ |
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73 | private $probabilityEstimates; |
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74 | |||
75 | /** |
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76 | * @var string |
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77 | */ |
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78 | private $binPath; |
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79 | |||
80 | /** |
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81 | * @var string |
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82 | */ |
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83 | private $varPath; |
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84 | |||
85 | /** |
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86 | * @var string |
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87 | */ |
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88 | private $model; |
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89 | |||
90 | /** |
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91 | * @var array |
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92 | */ |
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93 | private $targets = []; |
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94 | |||
95 | public function __construct( |
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96 | int $type, |
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97 | int $kernel, |
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98 | float $cost = 1.0, |
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99 | float $nu = 0.5, |
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100 | int $degree = 3, |
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101 | ?float $gamma = null, |
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102 | float $coef0 = 0.0, |
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103 | float $epsilon = 0.1, |
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104 | float $tolerance = 0.001, |
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105 | int $cacheSize = 100, |
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106 | bool $shrinking = true, |
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107 | bool $probabilityEstimates = false |
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108 | ) { |
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109 | $this->type = $type; |
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110 | $this->kernel = $kernel; |
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111 | $this->cost = $cost; |
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112 | $this->nu = $nu; |
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113 | $this->degree = $degree; |
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114 | $this->gamma = $gamma; |
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115 | $this->coef0 = $coef0; |
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116 | $this->epsilon = $epsilon; |
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117 | $this->tolerance = $tolerance; |
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118 | $this->cacheSize = $cacheSize; |
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119 | $this->shrinking = $shrinking; |
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120 | $this->probabilityEstimates = $probabilityEstimates; |
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121 | |||
122 | $rootPath = realpath(implode(DIRECTORY_SEPARATOR, [__DIR__, '..', '..', '..'])).DIRECTORY_SEPARATOR; |
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123 | |||
124 | $this->binPath = $rootPath.'bin'.DIRECTORY_SEPARATOR.'libsvm'.DIRECTORY_SEPARATOR; |
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125 | $this->varPath = $rootPath.'var'.DIRECTORY_SEPARATOR; |
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126 | } |
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127 | |||
128 | public function setBinPath(string $binPath): void |
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129 | { |
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130 | $this->ensureDirectorySeparator($binPath); |
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131 | $this->verifyBinPath($binPath); |
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132 | |||
133 | $this->binPath = $binPath; |
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134 | } |
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135 | |||
136 | public function setVarPath(string $varPath): void |
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137 | { |
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138 | if (!is_writable($varPath)) { |
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139 | throw InvalidArgumentException::pathNotWritable($varPath); |
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140 | } |
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141 | |||
142 | $this->ensureDirectorySeparator($varPath); |
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143 | $this->varPath = $varPath; |
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144 | } |
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145 | |||
146 | public function train(array $samples, array $targets): void |
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147 | { |
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148 | $this->samples = array_merge($this->samples, $samples); |
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149 | $this->targets = array_merge($this->targets, $targets); |
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150 | |||
151 | $trainingSet = DataTransformer::trainingSet($this->samples, $this->targets, in_array($this->type, [Type::EPSILON_SVR, Type::NU_SVR])); |
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152 | file_put_contents($trainingSetFileName = $this->varPath.uniqid('phpml', true), $trainingSet); |
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153 | $modelFileName = $trainingSetFileName.'-model'; |
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154 | |||
155 | $command = $this->buildTrainCommand($trainingSetFileName, $modelFileName); |
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156 | $output = []; |
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157 | exec(escapeshellcmd($command).' 2>&1', $output, $return); |
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158 | |||
159 | unlink($trainingSetFileName); |
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160 | |||
161 | if ($return !== 0) { |
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162 | throw LibsvmCommandException::failedToRun($command, array_pop($output)); |
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0 ignored issues
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|
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163 | } |
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164 | |||
165 | $this->model = file_get_contents($modelFileName); |
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166 | |||
167 | unlink($modelFileName); |
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168 | } |
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169 | |||
170 | public function getModel(): string |
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171 | { |
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172 | return $this->model; |
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173 | } |
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174 | |||
175 | /** |
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176 | * @return array|string |
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177 | * |
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178 | * @throws LibsvmCommandException |
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179 | */ |
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180 | public function predict(array $samples) |
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181 | { |
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182 | $testSet = DataTransformer::testSet($samples); |
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183 | file_put_contents($testSetFileName = $this->varPath.uniqid('phpml', true), $testSet); |
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184 | file_put_contents($modelFileName = $testSetFileName.'-model', $this->model); |
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185 | $outputFileName = $testSetFileName.'-output'; |
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186 | |||
187 | $command = sprintf('%ssvm-predict%s %s %s %s', $this->binPath, $this->getOSExtension(), $testSetFileName, $modelFileName, $outputFileName); |
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188 | $output = []; |
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189 | exec(escapeshellcmd($command).' 2>&1', $output, $return); |
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190 | |||
191 | unlink($testSetFileName); |
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192 | unlink($modelFileName); |
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193 | $predictions = file_get_contents($outputFileName); |
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194 | |||
195 | unlink($outputFileName); |
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196 | |||
197 | if ($return !== 0) { |
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198 | throw LibsvmCommandException::failedToRun($command, array_pop($output)); |
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0 ignored issues
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show
array_pop($output) is of type array|null , but the function expects a string .
It seems like the type of the argument is not accepted by the function/method which you are calling. In some cases, in particular if PHP’s automatic type-juggling kicks in this might be fine. In other cases, however this might be a bug. We suggest to add an explicit type cast like in the following example: function acceptsInteger($int) { }
$x = '123'; // string "123"
// Instead of
acceptsInteger($x);
// we recommend to use
acceptsInteger((integer) $x);
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199 | } |
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200 | |||
201 | if (in_array($this->type, [Type::C_SVC, Type::NU_SVC])) { |
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202 | $predictions = DataTransformer::predictions($predictions, $this->targets); |
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203 | } else { |
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204 | $predictions = explode(PHP_EOL, trim($predictions)); |
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205 | } |
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206 | |||
207 | if (!is_array($samples[0])) { |
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208 | return $predictions[0]; |
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209 | } |
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210 | |||
211 | return $predictions; |
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212 | } |
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213 | |||
214 | private function getOSExtension(): string |
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215 | { |
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216 | $os = strtoupper(substr(PHP_OS, 0, 3)); |
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217 | if ($os === 'WIN') { |
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218 | return '.exe'; |
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219 | } elseif ($os === 'DAR') { |
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220 | return '-osx'; |
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221 | } |
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222 | |||
223 | return ''; |
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224 | } |
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225 | |||
226 | private function buildTrainCommand(string $trainingSetFileName, string $modelFileName): string |
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227 | { |
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228 | return sprintf( |
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229 | '%ssvm-train%s -s %s -t %s -c %s -n %s -d %s%s -r %s -p %s -m %s -e %s -h %d -b %d %s %s', |
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230 | $this->binPath, |
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231 | $this->getOSExtension(), |
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232 | $this->type, |
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233 | $this->kernel, |
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234 | $this->cost, |
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235 | $this->nu, |
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236 | $this->degree, |
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237 | $this->gamma !== null ? ' -g '.$this->gamma : '', |
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238 | $this->coef0, |
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239 | $this->epsilon, |
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240 | $this->cacheSize, |
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241 | $this->tolerance, |
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242 | $this->shrinking, |
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243 | $this->probabilityEstimates, |
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244 | escapeshellarg($trainingSetFileName), |
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245 | escapeshellarg($modelFileName) |
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246 | ); |
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247 | } |
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248 | |||
249 | private function ensureDirectorySeparator(string &$path): void |
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250 | { |
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251 | if (substr($path, -1) !== DIRECTORY_SEPARATOR) { |
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252 | $path .= DIRECTORY_SEPARATOR; |
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253 | } |
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254 | } |
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255 | |||
256 | private function verifyBinPath(string $path): void |
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257 | { |
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258 | if (!is_dir($path)) { |
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259 | throw InvalidArgumentException::pathNotFound($path); |
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260 | } |
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261 | |||
262 | $osExtension = $this->getOSExtension(); |
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263 | foreach (['svm-predict', 'svm-scale', 'svm-train'] as $filename) { |
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264 | $filePath = $path.$filename.$osExtension; |
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265 | if (!file_exists($filePath)) { |
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266 | throw InvalidArgumentException::fileNotFound($filePath); |
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267 | } |
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268 | |||
269 | if (!is_executable($filePath)) { |
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270 | throw InvalidArgumentException::fileNotExecutable($filePath); |
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271 | } |
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272 | } |
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273 | } |
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274 | } |
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275 |
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: