Gurobi's output is not within the specified bounds

Wissal Guedri

2021年03月22日 07:58

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Hello,

I'm using cbGetNodeRel() to extract the variables' values, after the resolution of the linear relaxation of the MIP. However, I noticed that the retrieved values are not within the specified boundaries.

Here is an example:

IsUnbounded False
IsOptimal True
IsInfeasible False
Gurobi Output is [-0.2122615124209688, -0.27435047186283634, -0.5000000551328638, -1.2929915821077418, -0.7374218577665886, -0.301111111, 0.0]

Bounds:
inp0 -0.2952339157996051 -0.2122615124209688 :  -0.2122615124209688
inp1 -0.0636619772367539 -0.0222816920328639 : -0.27435047186283634
inp2 -0.5000000551328638 -0.498408505701945  : -0.5000000551328638
inp3 -0.5 -0.4545454545454545 : -1.2929915821077418
inp4 -0.5 -0.375 : -0.7374218577665886
inp5 -0.301111111 -0.301111111 : -0.301111111
inp6 0.0 0.0 : 0.0

Your help is really appreciated. Thanks

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• 正式なコメント

  

  Simranjit Kaur

  • Gurobi Staff

  2024年12月06日 00:34

  This post is more than three years old. Some information may not be up to date. For current information, please check the Gurobi Documentation or Knowledge Base. If you need more help, please create a new post in the community forum. Or why not try our AI Gurobot?.
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  Silke Horn

  • Gurobi Staff

  2021年03月22日 08:50

  Hi,

  Could you post your model's coefficient statistics?

  Silke

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  Wissal Guedri

  2021年03月22日 09:05

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  Hi,

  Model has 408 quadratic constraints
  Coefficient statistics:
  Matrix range [2e-05, 3e+00]
  QMatrix range [5e-09, 2e+00]
  QLMatrix range [1e-05, 1e+00]
  Objective range [1e+00, 1e+00]
  Bounds range [2e-02, 5e-01]
  RHS range [1e-02, 8e-01]
  QRHS range [1e-05, 6e-01]
  Presolve removed 0 rows and 2 columns

  Continuous model is non-convex -- solving as a MIP.

  Warning: diagonal adjustment of 2.7e-07 performed to make Q PSD
  Warning: diagonal adjustment of 4.4e-08 performed to make Q PSD
  Warning: diagonal adjustment of 2.2e-08 performed to make Q PSD
  Warning: diagonal adjustment of 1.9e-08 performed to make Q PSD
  Presolve removed 4 rows and 6 columns
  Presolve time: 0.51s
  Presolved: 25610 rows, 6697 columns, 305515 nonzeros
  Presolved model has 4 quadratic constraint(s)
  Presolved model has 6390 bilinear constraint(s)
  Variable types: 6697 continuous, 0 integer (0 binary)

  0

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