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[Bug-gnubg] sse and sigmoid bug

From: Joseph Heled
Subject: [Bug-gnubg] sse and sigmoid bug
Date: Mon, 2 Jul 2012 08:25:39 +1200


While "importing" the sse code to gnubg-nn I discovered an error in the sigmoid implementation. The calculation made by the see code did not match the one from the straight C code. (It was relatively easy for me to catch since sse can be toggled during run time in gnubg-nn)

Since this results in bad evaluations, I am surprised it has not been detected in gnubg.

Has anyone did a real side-by-side comparison of gnubg with sse enabled and disabled?

I would not like to make changes to gnubg, but encourage the people responsible for the sse code to have a look at gnubg-nn and see if they agree.



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