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Minor parameter changes #2449

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Opt-Mucca wants to merge 6 commits into from
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Minor parameter changes #2449

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b4a09e1
Add max degeneracyFactor
Opt-Mucca Jun 30, 2025
6f930b8
Lower parallelism filter threshold
Opt-Mucca Jun 30, 2025
181132e
Lower bound change acceptance threshold
Opt-Mucca Jun 30, 2025
64b1a3d
Revert parallelism threshold change
Opt-Mucca Jul 1, 2025
6af72c2
Change domain change threshold from .15 to .2
Opt-Mucca Jul 1, 2025
629c4b8
Add const_boundchg_threshold
Opt-Mucca Aug 13, 2025
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7 changes: 4 additions & 3 deletions highs/mip/HighsDomain.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -62,7 +62,8 @@ static inline double boundRange(double upper_bound, double lower_bound,
double tolerance, HighsVarType var_type) {
double range = upper_bound - lower_bound;
return range - (var_type == HighsVarType::kContinuous
? std::max(0.3 * range, 1000.0 * tolerance)
? std::max(HighsDomain::cont_boundchg_threshold * range,
1000.0 * tolerance)
: tolerance);
}

Expand Down Expand Up @@ -1353,7 +1354,7 @@ double HighsDomain::adjustedUb(HighsInt col, HighsCDouble boundVal,
else
relativeImprove /=
std::max(std::fabs(col_upper_[col]), std::fabs(bound));
accept = relativeImprove >= 0.3;
accept = relativeImprove >= cont_boundchg_threshold;
} else
accept = false;
}
Expand Down Expand Up @@ -1385,7 +1386,7 @@ double HighsDomain::adjustedLb(HighsInt col, HighsCDouble boundVal,
else
relativeImprove /=
std::max(std::fabs(col_lower_[col]), std::fabs(bound));
accept = relativeImprove >= 0.3;
accept = relativeImprove >= cont_boundchg_threshold;
} else
accept = false;
}
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2 changes: 2 additions & 0 deletions highs/mip/HighsDomain.h
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Expand Up @@ -339,6 +339,8 @@ class HighsDomain {
std::vector<double> col_lower_;
std::vector<double> col_upper_;

static constexpr double cont_boundchg_threshold = 0.2;

HighsDomain(HighsMipSolver& mipsolver);

HighsDomain(const HighsDomain& other)
Expand Down
2 changes: 1 addition & 1 deletion highs/mip/HighsSearch.cpp
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Expand Up @@ -1208,7 +1208,7 @@ HighsSearch::NodeResult HighsSearch::branch() {
}
}

double degeneracyFac = lp->computeLPDegneracy(localdom);
double degeneracyFac = std::min(10.0, lp->computeLPDegneracy(localdom));
pseudocost.setDegeneracyFactor(degeneracyFac);
if (degeneracyFac >= 10.0) pseudocost.setMinReliable(0);
// if (!mipsolver.submip)
Expand Down
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