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Re: [Bug-gnubg] Is GNUBG actively developed?

From: Philippe Michel
Subject: Re: [Bug-gnubg] Is GNUBG actively developed?
Date: Tue, 15 Jan 2013 23:11:32 +0100 (CET)
User-agent: Alpine 2.00 (BSF 1167 2008-08-23)

On Mon, 14 Jan 2013, Mark Higgins wrote:

What training approach have you been using, if you don't mind elaborating?

Supervised training. I used the same training tools that were used years ago to create the current nets.

The main difference is that I rolled out the training database while it previously used (as far as I know) 2ply evaluations from the preceding generation of nets.

This obviously took some time, but with current processors what was out of question in the early- to mid-2000s when the currents nets were trained is now doable.

I don't know if Joseph Heled did many iterations (reevaluate database / train nets / maybe add mishandled positions) but with rollouts, each of them take a long time (I did it twice for the crashed database and once for the contact one). This is then mostly a one-shot effort, at least until something important changes in the training database.

Another thing that must have been helpful is that I added to the trainig databases its positions with the other player on roll. I think this helped a little for the general playing strength and diminished significantly the odd/even plies discrepancies.

I used slightly larger pruning nets, with sizes adapted to SSE or AVX instructions, but I don't think it make much of a difference.

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