Default Primal Heuristics

Detailed Description

implementation files (.c files) of the default primal heuristics of SCIP

Files
file	heur_actconsdiving.c
	LP diving heuristic that chooses fixings w.r.t. the active constraints the variable appear in.
file	heur_adaptivediving.c
	diving heuristic that selects adaptively between the existing, public dive sets
file	heur_alns.c
	Adaptive large neighborhood search heuristic that orchestrates popular LNS heuristics.
file	heur_bound.c
	heuristic which fixes all integer variables to a bound (lower/upper) and solves the remaining LP
file	heur_clique.c
	LNS heuristic using a clique partition to restrict the search neighborhood.
file	heur_coefdiving.c
	LP diving heuristic that chooses fixings w.r.t. the matrix coefficients.
file	heur_completesol.c
	COMPLETESOL - primal heuristic trying to complete given partial solutions.
file	heur_conflictdiving.c
	LP diving heuristic that chooses fixings w.r.t. conflict locks.
file	heur_crossover.c
	crossover primal heuristic
file	heur_dins.c
	DINS primal heuristic (according to Ghosh)
file	heur_distributiondiving.c
	Diving heuristic that chooses fixings w.r.t. changes in the solution density after Pryor and Chinneck.
file	heur_dps.c
	dynamic partition search
file	heur_dualval.c
	dualval primal heuristic
file	heur_farkasdiving.c
	LP diving heuristic that tries to construct a Farkas-proof.
file	heur_feaspump.c
	Objective Feasibility Pump 2.0.
file	heur_fixandinfer.c
	fix-and-infer primal heuristic
file	heur_fracdiving.c
	LP diving heuristic that chooses fixings w.r.t. the fractionalities.
file	heur_gins.c
	LNS heuristic that tries to delimit the search region to a neighborhood in the constraint graph.
file	heur_guideddiving.c
	LP diving heuristic that chooses fixings in direction of incumbent solutions.
file	heur_indicator.c
	handle partial solutions for linear problems with indicators and otherwise continuous variables
file	heur_indicatordiving.c
	LP diving heuristic that fixes indicator variables controlling semicontinuous variables.
file	heur_intdiving.c
	LP diving heuristic that fixes variables with integral LP value.
file	heur_intshifting.c
	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.
file	heur_linesearchdiving.c
	LP diving heuristic that fixes variables with a large difference to their root solution.
file	heur_localbranching.c
	Local branching heuristic according to Fischetti and Lodi.
file	heur_locks.c
	rounding locks primal heuristic
file	heur_lpface.c
	lpface primal heuristic that searches the optimal LP face inside a sub-MIP
file	heur_mpec.c
	mpec primal heuristic
file	heur_multistart.c
	multistart heuristic for convex and nonconvex MINLPs
file	heur_mutation.c
	LNS heuristic that tries to randomly mutate the incumbent solution.
file	heur_nlpdiving.c
	NLP diving heuristic that chooses fixings w.r.t. the fractionalities.
file	heur_objpscostdiving.c
	LP diving heuristic that changes variable's objective value instead of bounds, using pseudo cost values as guide.
file	heur_octane.c
	octane primal heuristic based on Balas, Ceria, Dawande, Margot, and Pataki
file	heur_ofins.c
	OFINS - Objective Function Induced Neighborhood Search - a primal heuristic for reoptimization.
file	heur_oneopt.c
	improvement heuristic that alters single variable values
file	heur_proximity.c
	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.
file	heur_pscostdiving.c
	LP diving heuristic that chooses fixings w.r.t. the pseudo cost values.
file	heur_randrounding.c
	randomized LP rounding heuristic which also generates conflicts via an auxiliary probing tree
file	heur_rens.c
	LNS heuristic that finds the optimal rounding to a given point.
file	heur_reoptsols.c
	reoptsols primal heuristic
file	heur_repair.c
	repair primal heuristic
file	heur_rins.c
	LNS heuristic that combines the incumbent with the LP optimum.
file	heur_rootsoldiving.c
	LP diving heuristic that changes variable's objective values using root LP solution as guide.
file	heur_rounding.c
	LP rounding heuristic that tries to recover from intermediate infeasibilities.
file	heur_scheduler.c
	Adaptive heuristic to schedule LNS and diving heuristics.
file	heur_shiftandpropagate.c
	shiftandpropagate primal heuristic
file	heur_shifting.c
	LP rounding heuristic that tries to recover from intermediate infeasibilities and shifts continuous variables.
file	heur_simplerounding.c
	simple and fast LP rounding heuristic
file	heur_subnlp.c
	NLP local search primal heuristic using sub-SCIPs.
file	heur_sync.c
	primal heuristic that adds solutions from synchronization
file	heur_trivial.c
	trivial primal heuristic
file	heur_trivialnegation.c
	trivialnegation primal heuristic
file	heur_trustregion.c
	Large neighborhood search heuristic for Benders' decomposition based on trust region methods.
file	heur_trysol.c
	primal heuristic that tries a given solution
file	heur_twoopt.c
	primal heuristic to improve incumbent solution by flipping pairs of variables
file	heur_undercover.c
	Undercover primal heuristic for MINLPs.
file	heur_vbounds.c
	LNS heuristic uses the variable lower and upper bounds to determine the search neighborhood.
file	heur_veclendiving.c
	LP diving heuristic that rounds variables with long column vectors.
file	heur_zeroobj.c
	heuristic that tries to solve the problem without objective. In Gurobi, this heuristic is known as "Hail Mary"
file	heur_zirounding.c
	zirounding primal heuristic