chainer.functions.logsumexp¶
-
chainer.functions.
logsumexp
(x, axis=None)[source]¶ Log-sum-exp of array elements over a given axis.
This function calculates logarithm of sum of exponential of array elements.
\[y_i = \log\left(\sum_j \exp(x_{ij})\right)\]- Parameters
x (
Variable
or N-dimensional array) – Elements to log-sum-exp.axis (None, int, or tuple of int) – Axis which a sum is performed. The default (axis = None) is perform a sum over all the dimensions of the input array.
- Returns
Output variable.
- Return type