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ãã¡ããããã¥ãŒã©ã« ãããã¯ãŒã¯ ã¯ã©ã¹ãäœæããããšããå§ããããšãã§ããŸãã
npãšããŠnumpyãã€ã³ããŒããã
X=np.array([[0,1,1,0],[0,1,1,1],[1,0,0,1]])
y=np.array([[0],[1],[1]])
ã·ã°ã¢ã€ãé¢æ°ãé©çšãããšã次ã®ããã«ãªããŸãã
def sigmoid ():
return 1/(1 + np.exp(-x))
def derivatives_sigmoid ():
return x * (1-x)
åæã®éã¿ãšãã€ã¢ã¹ã䜿çšããŠã¢ãã«ããã¬ãŒãã³ã°ãã:
epoch=10000
lr=0.1
inputlayer_neurons = X.shape[1]
hiddenlayer_neurons = 3
output_neurons = 1
wh=np.random.uniform(size=(inputlayer_neurons,hiddenlayer_neurons))
bh=np.random.uniform(size=(1,hiddenlayer_neurons))
wout=np.random.uniform(size=(hiddenlayer_neurons,output_neurons))
bout=np.random.uniform(size=(1,output_neurons))
åå¿è
ã®å Žåããã¥ãŒã©ã« ãããã¯ãŒã¯ã«é¢ããŠãµããŒããå¿
èŠãªå Žåã¯ã次ã®åãåããå
ãŸã§ãé£çµ¡ãã ããã
åºåå±€ãã¥ãŒãã³ã䜿çšããã³ãŒãã®å€æŽ
hidden_layer_input1=np.dot(X,wh)
hidden_layer_input=hidden_layer_input1 + bh
hiddenlayer_activations = sigmoid(hidden_layer_input)
output_layer_input1=np.dot(hiddenlayer_activations,wout)
output_layer_input= output_layer_input1+ bout
output = sigmoid(output_layer_input)
ã³ãŒãã®é ãå±€ã®èª€å·®ã®èšç®
E = y-output
slope_output_layer = derivatives_sigmoid(output)
slope_hidden_layer = derivatives_sigmoid(hiddenlayer_activations)
d_output = E * slope_output_layer
Error_at_hidden_layer = d_output.dot(wout.T)
d_hiddenlayer = Error_at_hidden_layer * slope_hidden_layer
wout += hiddenlayer_activations.T.dot(d_output) *lr
bout += np.sum(d_output, axis=0,keepdims=True) *lr
wh += X.T.dot(d_hiddenlayer) *lr
bh += np.sum(d_hiddenlayer, axis=0,keepdims=True) *lr
åºåïŒ
print (output)
[[0.03391414]
[0.97065091]
[0.9895072 ]]
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