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import numpy as np
def relu(x):
return np.maximum(x, 0)
def relu_prime(x):
return np.where(x > 0, 1, 0)
def tanh(x):
return np.tanh(x)
def tanh_prime(x):
return 1 - np.tanh(x) ** 2
def sigmoid(x):
return 1.0 / (1.0 + np.exp(-x))
def sigmoid_prime(x):
s = sigmoid(x)
return s / 1.0 - s
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