Math optimization in C#

Question

I\'ve been profiling an application all day long and, having optimized a couple bits of code, I\'m left with this on my todo list. It\'s the activation function for a neural

Answer 1

There are a lot of good answers here. I would suggest running it through this technique, just to make sure

• You're not calling it any more times than you need to.
  (Sometimes functions get called more than necessary, just because they are so easy to call.)
• You're not calling it repeatedly with the same arguments
  (where you could use memoization)

BTW the function you have is the inverse logit function,
or the inverse of the log-odds-ratio function log(f/(1-f)).