Version 2.12.1
This is a bugfix release. It should resolve some issues some people saw where the sigmoid activation function would throw floating point overflow warnings.
To avoid the FPEs we return 0 when the sigmoid input is less than -30, and 1 when the input is greater than 30. This is the same behavior we had prior to e3622dd. The outputs should be unchanged to O(1e-6), if they change at all.