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Bin Packing : Coluna does not find a solution when CPLEX subsolver #382

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guimarqu opened this issue Jul 10, 2020 · 1 comment
Closed

Bin Packing : Coluna does not find a solution when CPLEX subsolver #382

guimarqu opened this issue Jul 10, 2020 · 1 comment
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bug Something isn't working needs investigation The issue needs investigation because we don't know if it's a bug and if it comes from Coluna.

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@guimarqu
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guimarqu commented Jul 10, 2020 •
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Describe the bug

  1. When using CPLEX, for some cases (for example, PM-u020-01.txt). Coluna won't find a solution.

To Reproduce
Bin packing demo PM-u020-01.txt

Expected behavior
Find the optimal solution

Thank you @rafaelmartinelli for reporting the issue.
Code :

using JuMP, BlockDecomposition, Coluna, GLPK, ColunaDemos
using DelimitedFiles

coluna = optimizer_with_attributes(
    Coluna.Optimizer,
    "params" => Coluna.Params(
        solver = Coluna.Algorithm.TreeSearchAlgorithm()
    ),
    "default_optimizer" => GLPK.Optimizer
)

d = ColunaDemos.BinPacking.data("instances/PM-u020-01.txt")
bpp, x, y, dec = BinPacking.model(d, coluna)

optimize!(bpp)
@guimarqu guimarqu added bug Something isn't working needs investigation The issue needs investigation because we don't know if it's a bug and if it comes from Coluna. labels Jul 10, 2020
@guimarqu guimarqu added this to the v0.4 milestone Jul 10, 2020
@guimarqu
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We can't reproduce this issue (we don't have cplex).

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bug Something isn't working needs investigation The issue needs investigation because we don't know if it's a bug and if it comes from Coluna.
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