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Code Issues Releases Activity

Simplify and correct ZonePlacer main loop, make sure to save optimal solution at every step.

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This commit is contained in:
Tomasz Zieliński
2023-06-14 14:07:31 +02:00
parent e1f8ae94ac
commit 2603e11f48
1 changed files with 46 additions and 30 deletions
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76
lib/rmg/CZonePlacer.cpp
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@@ -326,8 +326,43 @@ void CZonePlacer::placeZones(CRandomGenerator * rand)
TDistanceVector distances;
TDistanceVector overlaps;
auto evaluateSolution = [this, zones, &distances, &overlaps, &bestSolution]() -> bool
{
bool improvement = false;
float totalDistance = 0;
float totalOverlap = 0;
for (const auto& zone : distances) //find most misplaced zone
{
totalDistance += zone.second;
float overlap = overlaps[zone.first];
totalOverlap += overlap;
}
//check fitness function
if ((totalDistance + 1) * (totalOverlap + 1) < (bestTotalDistance + 1) * (bestTotalOverlap + 1))
{
//multiplication is better for auto-scaling, but stops working if one factor is 0
improvement = true;
}
//Save best solution
if (improvement)
{
bestTotalDistance = totalDistance;
bestTotalOverlap = totalOverlap;
for (const auto& zone : zones)
bestSolution[zone.second] = zone.second->getCenter();
}
logGlobal->trace("Total distance between zones after this iteration: %2.4f, Total overlap: %2.4f, Improved: %s", totalDistance, totalOverlap , improvement);
return improvement;
};
//Start with low stiffness. Bigger graphs need more time and more flexibility
for (stifness = stiffnessConstant / zones.size(); stifness <= stiffnessConstant; stifness *= stiffnessIncreaseFactor)
for (stifness = stiffnessConstant / zones.size(); stifness <= stiffnessConstant;)
{
//1. attract connected zones
attractConnectedZones(zones, forces, distances);
@@ -345,42 +380,23 @@ void CZonePlacer::placeZones(CRandomGenerator * rand)
totalForces[zone.first] += zone.second; //accumulate
}
//3. now perform drastic movement of zone that is completely not linked
bool improved = evaluateSolution();
moveOneZone(zones, totalForces, distances, overlaps);
//4. NOW after everything was moved, re-evaluate zone positions
attractConnectedZones(zones, forces, distances);
separateOverlappingZones(zones, forces, overlaps);
float totalDistance = 0;
float totalOverlap = 0;
for(const auto & zone : distances) //find most misplaced zone
if (!improved)
{
totalDistance += zone.second;
float overlap = overlaps[zone.first];
totalOverlap += overlap;
//3. now perform drastic movement of zone that is completely not linked
//TODO: Don't do this is fitness was improved
moveOneZone(zones, totalForces, distances, overlaps);
improved |= evaluateSolution();;
}
//check fitness function
bool improvement = false;
if ((totalDistance + 1) * (totalOverlap + 1) < (bestTotalDistance + 1) * (bestTotalOverlap + 1))
if (!improved)
{
//multiplication is better for auto-scaling, but stops working if one factor is 0
improvement = true;
//Only cool down if we didn't see any improvement
stifness *= stiffnessIncreaseFactor;
}
logGlobal->trace("Total distance between zones after this iteration: %2.4f, Total overlap: %2.4f, Improved: %s", totalDistance, totalOverlap , improvement);
//save best solution
if (improvement)
{
bestTotalDistance = totalDistance;
bestTotalOverlap = totalOverlap;
for(const auto & zone : zones)
bestSolution[zone.second] = zone.second->getCenter();
}
}
logGlobal->trace("Best fitness reached: total distance %2.4f, total overlap %2.4f", bestTotalDistance, bestTotalOverlap);