always-cautious/ortools-clone
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

new crash procedure for the dual simplex, off for now

Browse Source
This commit is contained in:
Laurent Perron
2021-03-10 11:40:47 +01:00
parent 9de99d789e
commit 7bcfc3a223
7 changed files with 361 additions and 47 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
ortools/glop/parameters.proto
View File

@@ -22,7 +22,7 @@ syntax = "proto2";
package operations_research.glop;
// next id = 62
// next id = 63
message GlopParameters {
// Supported algorithms for scaling:
@@ -413,6 +413,16 @@ message GlopParameters {
// simplex solver", Ph.D, dissertation, University of Edinburgh.
optional bool perturb_costs_in_dual_simplex = 53 [default = false];
// We have two possible dual phase I algorithms. Both work on an LP that
// minimize the sum of dual infeasiblities. One use dedicated code (when this
// param is true), the other one use exactly the same code as the dual phase
// II but on an auxiliary problem where the variable bounds of the original
// problem are changed.
//
// TODO(user): For now we have both, but ideally the non-dedicated version
// will win since it is a lot less code to maintain.
optional bool use_dedicated_dual_feasibility_algorithm = 62 [default = true];
// The magnitude of the cost perturbation is given by
// RandomIn(1.0, 2.0) * (
// relative_cost_perturbation * cost