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Committing a comment to the annealer to look at down the road, ideas from Kris to speed up the scheduler when the cost isnt changing, instead of waiting for the temperature to fall slowly, speed it up when the acceptance rate is really good or really bad

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james 2009-03-24 16:52:10 +00:00
parent 4b3455f730
commit b3bbd801ef
1 changed files with 28 additions and 0 deletions
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28
admin/anneal.inc.php
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@ -275,6 +275,34 @@ class annealer {
break;
// TRACE("Cost is {$this->cost}\n");
$temperature *= $this->rate;
/*
FIXME: README: NOTE: TODO:
From Kris, 2009-03-24
Dave do you think we should consider something like this?
<Kris_School_1> here's the schedule i use in my academic annealer:
if( _params._useVPRTempSchedule ) {
// This is VPR's temperature schedule...
if( successRate > 0.96 ) {
_temp *= 0.5;
} else if( successRate > 0.8 ) {
_temp *= 0.9;
} else if( successRate > 0.15 || !windowsSized ) {
_temp *= 0.95;
} else {
_temp *= 0.8;
}
} else {
// This is identical to Aaarts and Van Laarhaven.
real64 kappa = _params._tempReduction; // 1.0 == slow, 10 = reasonable, 100 == fast
real64 sqrvar = std::sqrt( variance );
if( variance <= EPSNEG || sqrvar <= EPSNEG ) {
_temp = 0.;
} else {
_temp = _temp * ( sqrvar / ( sqrvar + kappa * _temp ) );
}
}
*/
}
TRACE("Annealing complete. {$this->iterations} iterations. Final cost is {$this->cost}\n");
}