J'essaie d'appliquer un réseau de neurones (Multi perceptron) à mes données. Je reçois cette erreur: ValueError: shapes (3,) et (4,99) non alignés: 3 (dim 0)! = 4 (dim 0)Neural Networks Value Errors: Formes non alliées
J'ai une erreur sur cette ligne: a = self.activation (np.dot (a, self.weights [l]))
Si quelqu'un pouvait m'aider, je serais heureux.Merci.
nn_inputs: [[15, 0, 2,48489062802], [-35, 29, 1,15616438943], [-5, -1, 2,32958496377], [-48, 33, 0,706488511889], [-10, 2 , 2,09510386284], [-3, 11, 1,8423515073]]
nn_labels: [0, 1, 0, 1, 0, 1]
def tanh(x):
return np.tanh(x)
def tanh_deriv(x):
return 1.0 - np.tanh(x)**2
def logistic(x):
return 1/(1 + np.exp(-x))
def logistic_derivative(x):
return logistic(x)*(1-logistic(x))
class NeuralNetwork:
def __init__(self, layers, activation='tanh'):
"""
:param layers: A list containing the number of units in each layer.
Should be at least two values
:param activation: The activation function to be used. Can be
"logistic" or "tanh"
"""
if activation == 'logistic':
self.activation = logistic
self.activation_deriv = logistic_derivative
elif activation == 'tanh':
self.activation = tanh
self.activation_deriv = tanh_deriv
self.weights = []
for i in range(1, len(layers) - 1):
self.weights.append((2*np.random.random((layers[i - 1] + 1, layers[i]+ 1))-1)*0.25)
self.weights.append((2*np.random.random((layers[i] + 1, layers[i +
1]))-1)*0.25)
def fit(self, X, y, learning_rate=0.2, epochs=10000):
X = np.atleast_2d(X)
temp = np.ones([X.shape[0], X.shape[1]+1])
temp[:, 0:-1] = X # adding the bias unit to the input layer
X = temp
y = np.array(y)
for k in range(epochs):
i = np.random.randint(X.shape[0])
a = [X[i]]
for l in range(len(self.weights)):
a.append(self.activation(np.dot(a[l], self.weights[l])))
error = y[i] - a[-1]
deltas = [error * self.activation_deriv(a[-1])]
for l in range(len(a) - 2, 0, -1): # we need to begin at the second to last layer
deltas.append(deltas[-1].dot(self.weights[l].T)*self.activation_deriv(a[l]))
deltas.reverse()
for i in range(len(self.weights)):
layer = np.atleast_2d(a[i])
delta = np.atleast_2d(deltas[i])
self.weights[i] += learning_rate * layer.T.dot(delta)
def predict(self, x):
x = np.array(x)
temp = np.ones(x.shape[0]+1)
temp[0:-1] = x
a = temp
for l in range(0, len(self.weights)):
a = self.activation(np.dot(a, self.weights[l]))
return a
nn_inputs = map(list, zip(speed, occupancy, capacity))
nn_labels = labels
nn = NeuralNetwork([3,len(nn_inputs),1], 'tanh')
nn.fit(nn_inputs, nn_labels)
for i in [[0, 0], [0, 1], [1, 0], [1,1]]:
print(i,nn.predict(i))
Malheureusement, cela n'a pas fonctionné.Je ne comprends pas comment fonctionne la forme dans Nd @dougoutigui – serenade
Salut @Serenade, ça marche bien pour moi – dougoutigui