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RE: [Bug-gnubg] Re: Confidence intervals from rollouts

From: David Montgomery
Subject: RE: [Bug-gnubg] Re: Confidence intervals from rollouts
Date: Thu, 5 Sep 2002 12:25:09 -0700

> Actually thrice :-)

As long as we are counting, we should count Fredrik Dahl, 
who I believe did it first, for a total of four. :-)
> Gary's rollout code from rollout.c has:
>   for( i = 0; i < cGames; i++ ) {
>      if( prc->rngRollout != RNG_MANUAL )
>         InitRNGSeed( rcRollout.nSeed + ( i << 8 ), prc->rngRollout );
> Since gnubg doesn't change the seed between rollouts of different moves
> the same dice sequence will be used for each game.

This gives duplicate dice, but unless I'm mistaken it
doesn't do stratified sampling (perfect distribution
of rolls at every depth).  I'm not sure whether Joseph
was saying he had duplicate dice, or stratified sampling,
or both.

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