add document for axis argument
@@ -95,6 +95,7 @@ def softmax(x, use_cudnn=True, axis=1):
x (~chainer.Variable): Input variable.
use_cudnn (bool): If ``True`` and cuDNN is enabled, then this function
uses cuDNN as the core implementation.
+ axis: The axis along which the softmax is to be computed.
Returns:
~chainer.Variable: Output variable.
