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HEURSEARCHSTRATEGY

Description
Meta strategy control for large neighborhood search (LNS) heuristics. When set to a value other than automatic, it determines the frequency and effort of all LNS heuristics whose individual strategy control is set to automatic. Individual heuristic strategy controls take precedence over this setting.
Type
Integer
Topic area
Heuristics
Values
-1 
XPRS_HEURSEARCHSTRATEGY_AUTOMATIC Each LNS heuristic uses its own default strategy.
0 
XPRS_HEURSEARCHSTRATEGY_OFF All LNS heuristics set to automatic are disabled.
1 
XPRS_HEURSEARCHSTRATEGY_CONSERVATIVE Conservative strategy applied to all LNS heuristics set to automatic.
2 
XPRS_HEURSEARCHSTRATEGY_MODERATE Moderate strategy applied to all LNS heuristics set to automatic.
3 
XPRS_HEURSEARCHSTRATEGY_AGGRESSIVE Aggressive strategy applied to all LNS heuristics set to automatic.
Default value
-1
Notes
Each individual LNS heuristic control has a special value XPRS_HEURSEARCHSTRATEGY_AUTOENFORCED, which can be set to ignore the value of this meta control and force the default behavior for the heuristic.
At a moderate strategy, the LNS heuristics obey any user-specified value for HEURSEARCHROOTCUTFREQ and/or HEURSEARCHFREQ exactly. However, setting an LNS heuristic to a conservative (aggressive) strategy will lead to a less (more) frequent execution during the root cut loop and/or during the tree search than mandated by the frequency controls.
Affects routines
XPRSmipoptimize ( MIPOPTIMIZE).
See also
HEURSEARCHRINSSTRATEGY, HEURSEARCHLPFIRSTSTRATEGY, HEURSEARCHMIPFIRSTSTRATEGY, HEURSEARCHCOMBINESTRATEGY, HEURSEARCHZEROOBJSTRATEGY, HEURSEARCHANALYTICSTRATEGY, HEUREMPHASIS.
Category
Control

Parent Topic Control Parameters

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