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<?php |
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namespace MachineLearning\Domain\Hypothesis; |
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use MachineLearning\Domain\Exception\WrongVariableForHypothesisException; |
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use MachineLearning\Domain\Model\Result; |
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use MachineLearning\Domain\Model\Value\VectorValue; |
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use MachineLearning\Domain\Model\Value\ScalarValue; |
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use MachineLearning\Domain\Model\ValueInterface; |
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class Linear implements HypothesisInterface |
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{ |
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/** |
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* @inheritdoc |
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*/ |
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public function calculate(ValueInterface $coefficient, ValueInterface $variable) |
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{ |
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if (! $variable instanceof VectorValue) { |
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throw new WrongVariableForHypothesisException(); |
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} |
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list($offset, $firstOrderCoefficients) = $this->getParameters($coefficient, $variable); |
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$value = $offset+$variable->scalar($firstOrderCoefficients); |
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return new ScalarValue($value); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function derivative(ValueInterface $coefficient, ValueInterface $variable, $partialVariable) |
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{ |
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if (! $variable instanceof VectorValue) { |
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throw new WrongVariableForHypothesisException(); |
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} |
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$x = $variable->getValue(); |
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return new ScalarValue($x[$partialVariable]); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function createResultFromData(array $data) |
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{ |
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return new Result( |
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new VectorValue($data[0]), |
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new ScalarValue($data[1]) |
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); |
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} |
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/** |
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* @param ValueInterface $coefficient |
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* @param ValueInterface $variable |
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* @return array |
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*/ |
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protected function getParameters(ValueInterface $coefficient, ValueInterface $variable) |
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{ |
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$coefficientValues = $coefficient->getValue(); //e.g. [1,1,3] |
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$offset = $coefficientValues[0]; |
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array_shift($coefficientValues); |
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$firstOrderCoefficients = new VectorValue($coefficientValues); |
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return array($offset, $firstOrderCoefficients); |
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} |
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} |
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zeopix /
MachineLearning
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This check looks from parameters that have been defined for a function or method, but which are not used in the method body.