Created
August 30, 2018 00:07
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PMC problemática na atualização.
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import numpy as np | |
def sigmoid(soma): | |
return 1 / (1+np.exp(-soma)) | |
def sigmoidDerivada(sig): | |
return sig * (1 - sig) | |
entradas = np.array([[0,0], | |
[0,1], | |
[1,0], | |
[1,1]]) | |
saidas = np.array([[0],[1],[1],[0]]) | |
pesos0 = np.array([[-0.424, -0.740, -0.961], | |
[0.358, -0.577, -0.469]]) | |
pesos1 = np.array([[-0.017], [-0.893], [0.148]]) | |
epocas = 100 | |
taxaAprendizagem = 0.3 | |
momento = 1 | |
for j in range(epocas): | |
camadaEntrada = entradas | |
somaSinapse0 = np.dot(camadaEntrada, pesos0) | |
camadaOculta = sigmoid(somaSinapse0) | |
somaSinapse1 = np.dot(camadaOculta, pesos1) | |
camadaSaida = sigmoid(somaSinapse1) | |
erroCamadaSaida = saidas - camadaSaida | |
mediaAbsoluta = np.mean(np.abs(erroCamadaSaida)) | |
derivadaSaida = sigmoidDerivada(camadaSaida) | |
deltaSaida = erroCamadaSaida * derivadaSaida | |
pesos1Transposta = pesos1.T | |
deltaSaidaXPeso = deltaSaida.dot(pesos1Transposta) | |
deltaCamadaOculta = deltaSaidaXPeso * sigmoidDerivada(camadaOculta) | |
camadaOcultaTransposta = camadaOculta.T | |
pesosNovo1 = camadaOcultaTransposta.dot(deltaSaida) | |
pesos1 = (pesos1 * momento) + (pesosNovo1 * taxaAprendizagem) |
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