Source code for GPy.util.squashers

# Copyright (c) 2012, GPy authors (see AUTHORS.txt).
# Licensed under the BSD 3-clause license (see LICENSE.txt)


import numpy as np

[docs]def sigmoid(x):
    return 1./(1.+np.exp(-x))

[docs]def softmax(x):
    ex = np.exp(x-x.max(1)[:,None])
    return ex/ex.sum(1)[:,np.newaxis]

[docs]def single_softmax(x):
    ex = np.exp(x)
    return ex/ex.sum()