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Re: [Bug-gnubg] Possible error in SSE sigmoid calculation

From: Philippe Michel
Subject: Re: [Bug-gnubg] Possible error in SSE sigmoid calculation
Date: Sat, 31 Dec 2011 14:57:50 +0100 (CET)
User-agent: Alpine 2.00 (BSF 1167 2008-08-23)

On Thu, 22 Dec 2011, Joseph Heled wrote:

I am not sure which nets and which sigmoid implementation is used by
gnubg now - but note that my nets were trained against an
approximation. It does not matter that much if you use the exact
definition - what is important is using a "valid pair", that is a net
and the sigmoid implementation it was trained with.

In the past, breaking this meant a serious drop in move quality. I
suggest someone checks this ....

As far as I understand, the non-SSE sigmoid approximation in gnubg is the same as the one in gnubg-nn (the default code in the latter, with SIGMOIDNEW undefined). With the SSE code in gnubg now fixed, the sigmoid implementation is the same everywhere.

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