141 lines
6.1 KiB
Python
Executable File
141 lines
6.1 KiB
Python
Executable File
import numpy as np
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class network:
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def __init__(self, inputLayerSize, *layerSizes):
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if type(inputLayerSize) != int:
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raise TypeError("The input layer size must be an int!")
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self.weights = []
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self.__inputLayerSize = inputLayerSize
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oldLayerSize = inputLayerSize
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for layerSize in layerSizes:
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self.weights.append( np.random.randn(layerSize, oldLayerSize) )
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oldLayerSize = layerSize
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self.biases = [np.random.randn(layerSize) for layerSize in layerSizes]
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def __reLu(value, derivative=False):
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if (derivative):
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return 0 if (value < 0) else 1
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return max(0, value)
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def __sigmoid(value, derivative=False):
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if (derivative):
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return network.__sigmoid(value) * (1 - network.__sigmoid(value))
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return 1.0/(1.0+np.exp(-value))
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def process(self, _input, __storeValues=False):
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if type(_input) != np.ndarray:
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raise TypeError("The input must be a vector!")
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if _input.size != self.__inputLayerSize:
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raise ValueError("The input vector has the wrong size!")
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if _input.dtype != np.float64:
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print(_input.dtype)
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raise TypeError("The input vector must contain floats!")
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if (__storeValues):
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self.activations = []
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self.outputs = []
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self.outputs.append(_input)
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for layerWeights, layerBias in zip(self.weights, self.biases):
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_input = np.dot(layerWeights, _input)
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_input = np.add(_input, layerBias)
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if (__storeValues):
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self.activations.append(_input)
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#activation function application
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#for i in range(len(_input)):
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# _input[i] = network.__sigmoid(_input)
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_input = network.__sigmoid(_input)
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#On peut comparer la performance si on recalcul plus tard
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if (__storeValues):
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self.outputs.append(_input)
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return _input
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def train(self, inputs, desiredOutputs, learningRate):
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if (len(inputs) != len(desiredOutputs)):
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raise ValueError("The inputs and desired outputs vectors must have the same amount of data !")
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for _input, desiredOutput in zip(inputs, desiredOutputs):
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errorSumsWeights = [np.zeros(layer.shape) for layer in self.weights]
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errorSumsBiases = [np.zeros(layer.shape) for layer in self.biases]
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self.__errors = [np.zeros(len(layer)) for layer in self.weights]
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#rempli self.activations et self.outputs
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self.process(_input, True)
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self.__desiredOutput = desiredOutput
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#Somme de matrice ?
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for layerNumber in range(len(errorSumsWeights)-1, -1, -1):
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for neuronNumber in range(len(errorSumsWeights[layerNumber])):
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errorSumsBiases[layerNumber][neuronNumber] += self.__Error(layerNumber, neuronNumber)
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for weightNumber in range(len(errorSumsWeights[layerNumber][neuronNumber])):
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#print("layer : " + str(layerNumber) + " neuron : " + str(neuronNumber) + " weight : " + str(weightNumber))
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errorSumsWeights[layerNumber][neuronNumber][weightNumber] += self.__PartialDerivative(layerNumber, neuronNumber, weightNumber)
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total = 0
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errorSumsWeights = np.multiply(errorSumsWeights, -(learningRate/len(inputs)))
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self.weights = np.add(self.weights, errorSumsWeights)
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errorSumsBiases = np.multiply(errorSumsBiases, -(learningRate/len(inputs)))
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self.biases = np.add(self.biases, errorSumsBiases)
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#print(self.__biases)
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"""
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for layerNumber in range(len(errorSumsWeights)):
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for neuronNumber in range(len(errorSumsWeights[layerNumber])):
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errorSumsBiases[layerNumber][neuronNumber] = errorSumsBiases[layerNumber][neuronNumber] / len(inputs)
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total += errorSumsBiases[layerNumber][neuronNumber]
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self.biases[layerNumber][neuronNumber] -= learningRate * errorSumsBiases[layerNumber][neuronNumber]
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for weightNumber in range(len(errorSumsWeights[layerNumber][neuronNumber])):
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#Probablement faisable avec une multiplication de matrices
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errorSumsWeights[layerNumber][neuronNumber][weightNumber] = errorSumsWeights[layerNumber][neuronNumber][weightNumber] / len(inputs)
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total += errorSumsWeights[layerNumber][neuronNumber][weightNumber]
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#Probablement faisable avec une somme de matrices
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self.weights[layerNumber][neuronNumber][weightNumber] -= learningRate * errorSumsWeights[layerNumber][neuronNumber][weightNumber]
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#print("Error : " + str(total))"""
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def __Error(self, layer, neuron):
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if (self.__errors[layer][neuron] == 0 ):
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self.__errors[layer][neuron] = self.__ErrorFinalLayer(neuron) if (layer == len(self.weights)-1) else self.__ErrorHiddenLayer(layer, neuron)
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return self.__errors[layer][neuron]
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def __ErrorFinalLayer(self, neuron):
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return network.__sigmoid(self.activations[-1][neuron], derivative=True) * (self.outputs[-1][neuron] - self.__desiredOutput[neuron])
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def __ErrorHiddenLayer(self, layer, neuron):
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upperLayerLinksSum = 0
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#Probablement faisable avec une multiplication de matrices
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for upperLayerNeuron in range(len(self.weights[layer+1])):
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upperLayerLinksSum += self.weights[layer+1][upperLayerNeuron][neuron] * self.__errors[layer+1][upperLayerNeuron]
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return network.__sigmoid(self.activations[layer][neuron], derivative=True) * upperLayerLinksSum
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def __PartialDerivative(self, layer, neuron, weight):
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return self.__Error(layer, neuron) * self.outputs[layer][weight]
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def saveToFile(self, fileName):
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np.savez(fileName, biases=self.biases, weights=self.weights)
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def loadFromFile(self, fileName):
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data = np.load(fileName)
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self.biases = data['biases']
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self.weights = data['weights'] |