Initializing help system before first use

HEURSEARCHTREESELECT

Description
This parameter is deprecated and will be removed in a future release. This control has been deprecated. Use the meta LNS heuristic strategy control HEURSEARCHSTRATEGY or one of the individual strategy controls to (de-)activate individual LNS heuristics.
A bit-vector control (see Section Bit-vector controls) for selecting which large neighborhood search (LNS) heuristics to apply during the tree search of a MIP solve.
Type
Integer
Topic areas
Heuristics, Branch and Bound Search, Bit-vector
Values
Bit
Meaning
0 
LNS heuristic with a large neighborhood. Potentially expensive but good for finding solutions that differs significantly from the incumbent. Use HEURSEARCHRINSSTRATEGY instead.
1 
LNS heuristic with a small neighborhood centered around a node LP solution. Use HEURSEARCHLPFIRSTSTRATEGY instead.
2 
LNS heuristic with a small neighborhood centered around an integer solution. This heuristic will often provide smaller, incremental improvements to an incumbent solution. Use HEURSEARCHMIPFIRSTSTRATEGY instead.
3 
LNS heuristic with a neighborhood set up through the combination of multiple integer solutions. Use HEURSEARCHCOMBINESTRATEGY instead.
5 
LNS heuristic without an objective function. Called seldom and only when no feasible solution is available. Use HEURSEARCHZEROOBJSTRATEGY instead.
6 
LNS heuristic with an auxiliary objective function. Called seldom and only when no feasible solution is available. Use HEURSEARCHANALYTICSTRATEGY instead.
Default value
17
Note
Some of the LNS heuristics will benefit from having an existing incumbent solution, but it is not required. An initial solution can also be provided by the user through XPRSaddmipsol.
Affects routines
XPRSmipoptimize ( MIPOPTIMIZE).
See also
HEUREMPHASIS, HEURSEARCHSTRATEGY, HEURSEARCHANALYTICSTRATEGY, HEURSEARCHCOMBINESTRATEGY, HEURSEARCHLPFIRSTSTRATEGY, HEURSEARCHMIPFIRSTSTRATEGY, HEURSEARCHRINSSTRATEGY, HEURSEARCHZEROOBJSTRATEGY, HEURSEARCHEFFORT.
Category
Control

Parent Topic Control Parameters

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