added description of example
@@ -76,6 +76,7 @@ def sigmoid(x, use_cudnn=True):
.. admonition:: Example
+ It maps the input values into the range of :math:`[0, 1]`.
>>> x = np.arange(-2, 3, 2).astype('f')
>>> x
array([-2., 0., 2.], dtype=float32)
