This page contains a list of all primal heuristics which are currently available.
A detailed description what a primal heuristic does and how to add a primal heuristic to SCIP can be found here.
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| file | heur_actconsdiving.h |
| | LP diving heuristic that chooses fixings w.r.t. the active constraints the variable appear in.
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| file | heur_bound.h |
| | heuristic which fixes all integer variables to a bound (lower/upper) and solves the remaining LP
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| file | heur_clique.h |
| | LNS heuristic using a clique partition to restrict the search neighborhood.
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| file | heur_coefdiving.h |
| | LP diving heuristic that chooses fixings w.r.t. the matrix coefficients.
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| file | heur_crossover.h |
| | LNS heuristic that tries to combine several feasible solutions.
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| file | heur_dins.h |
| | DINS primal heuristic.
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| file | heur_distributiondiving.h |
| | Diving heuristic that chooses fixings w.r.t. changes in the solution density after Pryor and Chinneck.
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| file | heur_dualval.h |
| | primal heuristic that uses dualvalues for successive switching variable values
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| file | heur_feaspump.h |
| | Objective Feasibility Pump 2.0.
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| file | heur_fixandinfer.h |
| | fix-and-infer primal heuristic
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| file | heur_fracdiving.h |
| | LP diving heuristic that chooses fixings w.r.t. the fractionalities.
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| file | heur_guideddiving.h |
| | LP diving heuristic that chooses fixings in direction of incumbent solutions.
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| file | heur_indicator.h |
| | handle partial solutions for linear problems with indicators and otherwise continuous variables
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| file | heur_intdiving.h |
| | LP diving heuristic that fixes variables with integral LP value.
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| file | heur_intshifting.h |
| | LP rounding heuristic that tries to recover from intermediate infeasibilities, shifts integer variables, and solves a final LP to calculate feasible values for continuous variables.
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| file | heur_linesearchdiving.h |
| | LP diving heuristic that fixes variables with a large difference to their root solution.
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| file | heur_localbranching.h |
| | Local branching heuristic according to Fischetti and Lodi.
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| file | heur_mutation.h |
| | LNS heuristic that tries to randomly mutate the incumbent solution.
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| file | heur_nlpdiving.h |
| | NLP diving heuristic that chooses fixings w.r.t. the fractionalities.
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| file | heur_objpscostdiving.h |
| | LP diving heuristic that changes variable's objective value instead of bounds, using pseudo cost values as guide.
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| file | heur_octane.h |
| | octane primal heuristic based on Balas, Ceria, Dawande, Margot, and Pataki
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| file | heur_ofins.h |
| | OFINS - Objective Function Induced Neighborhood Search - a primal heuristic for reoptimization.
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| file | heur_oneopt.h |
| | Improvement heuristic that alters single variable values.
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| file | heur_proximity.h |
| | improvement heuristic which uses an auxiliary objective instead of the original objective function which is itself added as a constraint to a sub-SCIP instance. The heuristic was presented by Matteo Fischetti and Michele Monaci
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| file | heur_pscostdiving.h |
| | LP diving heuristic that chooses fixings w.r.t. the pseudo cost values.
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| file | heur_randrounding.h |
| | randomized LP rounding heuristic which also generates conflicts via an auxiliary probing tree
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| file | heur_rens.h |
| | LNS heuristic that finds the optimal rounding to a given point.
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| file | heur_reoptsols.h |
| | reoptsols primal heuristic
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| file | heur_rins.h |
| | LNS heuristic that combines the incumbent with the LP optimum.
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| file | heur_rootsoldiving.h |
| | LP diving heuristic that changes variables' objective values using root LP solution as guide.
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| file | heur_rounding.h |
| | LP rounding heuristic that tries to recover from intermediate infeasibilities.
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| file | heur_shiftandpropagate.h |
| | preroot heuristic that alternatingly fixes variables and propagates domains
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| file | heur_shifting.h |
| | LP rounding heuristic that tries to recover from intermediate infeasibilities and shifts continuous variables.
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| file | heur_simplerounding.h |
| | Simple and fast LP rounding heuristic.
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| file | heur_subnlp.h |
| | NLP local search primal heuristic using sub-SCIPs.
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| file | heur_trivial.h |
| | trivial primal heuristic
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| file | heur_trivialnegation.h |
| | trivialnegation primal heuristic
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| file | heur_trysol.h |
| | primal heuristic that tries a given solution
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| file | heur_twoopt.h |
| | Primal heuristic to improve incumbent solution by flipping pairs of variables.
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| file | heur_undercover.h |
| | Undercover primal heuristic for MINLPs.
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| file | heur_vbounds.h |
| | LNS heuristic uses the variable lower and upper bounds to determine the search neighborhood.
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| file | heur_veclendiving.h |
| | LP diving heuristic that rounds variables with long column vectors.
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| file | heur_zeroobj.h |
| | heuristic that tries to solve the problem without objective. In Gurobi, this heuristic is known as "Hail Mary"
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| file | heur_zirounding.h |
| | ZI Round primal heuristic.
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