chainer.functions.sigmoid¶
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chainer.functions.
sigmoid
(x)[source]¶ Element-wise sigmoid logistic function.
\[f(x)=(1 + \exp(-x))^{-1}.\]Parameters: x ( Variable
ornumpy.ndarray
orcupy.ndarray
) – Input variable. A \((s_1, s_2, ..., s_N)\)-shaped float array.Returns: Output variable. A \((s_1, s_2, ..., s_N)\)-shaped float array. Return type: Variable Example
It maps the input values into the range of \([0, 1]\).
>>> x = np.arange(-2, 3, 2).astype('f') >>> x array([-2., 0., 2.], dtype=float32) >>> F.sigmoid(x) variable([0.11920291, 0.5 , 0.8807971 ])