Initializing help system before first use

# HEUREMPHASIS

Description | Branch and Bound: This control specifies an emphasis for the search w.r.t. primal heuristics and other procedures that affect the speed of convergence of the primal-dual gap. For problems where the goal is to achieve a small gap but not neccessarily solving them to optimality, it is recommended to set HEUREMPHASIS to 1. This setting triggers many additional heuristic calls, aiming for reducing the gap at the beginning of the search, typically at the expense of an increased time for proving optimality.
Type | Integer
Topic area | Heuristics
Values |
-1 | Optimizer default strategy.
0 | Disables all heuristics.
1 | Focus on reducing the primal-dual gap in the early part of the search.
2 | Extremely aggressive search heuristics.
Default value | -1
Note | A setting of this control to 2 will enable the Pre-root parallel heuristic phase for a limited, problem-dependent amount of work. This phase can be explicitly disabled by setting PREROOTEFFORT to 0.
Affects routines | XPRSmipoptimize ( MIPOPTIMIZE).
Category | Control

Parent Topic Control Parameters

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