Submitter | Variables | Constraints | Density | Status | Group | Objective | MPS File |
---|---|---|---|---|---|---|---|

Simon Felix | 80600 | 160000 | 3.71824e-05 | open | schedule | -35.4988125672093* | fhnw-schedule-paira400.mps.gz |

Continuous-time project scheduling and selection, inspired by an industry use-case. Each project has a value, the sum should be maximized. Each project has a deadline, and an earliest start date. Three formulations of the same problem ("Pair A", "Pair B" and "Slot") - we expect "Pair B" to be the best formulation.

Detailed explanation of the following tables can be found here.

Original | Presolved | |
---|---|---|

Variables | 80600 | 80504 |

Constraints | 160000 | 159904 |

Binaries | 80200 | 80104 |

Integers | 0 | 0 |

Continuous | 400 | 400 |

Implicit Integers | 0 | 0 |

Fixed Variables | 0 | 0 |

Nonzero Density | 3.71824e-05 | 3.72416e-05 |

Nonzeroes | 479504 | 479408 |

Original | Presolved | |
---|---|---|

Total | 160000 | 159904 |

Empty | 0 | 0 |

Free | 0 | 0 |

Singleton | 96 | 0 |

Aggregations | 0 | 0 |

Precedence | 0 | 0 |

Variable Bound | 304 | 304 |

Set Partitioning | 0 | 0 |

Set Packing | 0 | 0 |

Set Covering | 0 | 0 |

Cardinality | 0 | 0 |

Invariant Knapsack | 0 | 0 |

Equation Knapsack | 0 | 0 |

Bin Packing | 0 | 0 |

Knapsack | 0 | 0 |

Integer Knapsack | 0 | 0 |

Mixed Binary | 159600 | 159600 |

General Linear | 0 | 0 |

Indicator | 0 | 0 |

Available nonzero structure and decomposition information. Further information can be found here.

Decomposed structure of original problem (dec-file)

Decomposed structure after trivial presolving (dec-file)

value | min | median | mean | max | |
---|---|---|---|---|---|

Components | 0.301030 | ||||

Constraint % | 99.8099 | 99.8099 | 99.8099 | 99.8099 | |

Variable % | 99.6224 | 99.6224 | 99.6224 | 99.6224 | |

Score | 0.003769 |

Find solutions below. Download the archive containing all solutions from the Download page.

ID | Objective | Exact | Int. Viol | Cons. Viol | Obj. Viol | Submitter | Date | Description | |
---|---|---|---|---|---|---|---|---|---|

1 | 3 | -35.49881 | 6.9e-06 | 0.0000000 | 0.0e+00 | Edward Rothberg | 2019-12-13 | Obtained with Gurobi 9.0 | |

3 | 2 | -20.49320 | -20.49319 | 0.0e+00 | 0.0007593 | 8.6e-06 | Frederic Didier | 2020-01-22 | Obtained with Google OR-tools using 8 Threads through generating subproblems by fixing part of the current solution and trying to solve them with a sub CP-SAT solver |

2 | 1 | -11.31802 | 1.0e-05 | 0.0000000 | 0.0e+00 | - | 2018-10-10 | Solution found during MIPLIB2017 problem selection. |

The following instances are most similar to fhnw-schedule-paira400 in the collection. This similarity analysis is based on 100 scaled instance features describing properties of the variables, objective function, bounds, constraints, and right hand sides.

Instance | Status | Variables | Binaries | Integers | Continuous | Constraints | Nonz. | Submitter | Group | Objective | Tags |
---|---|---|---|---|---|---|---|---|---|---|---|

fhnw-schedule-paira200 | open | 20300 | 20100 | 0 | 200 | 40000 | 119746 | Simon Felix | schedule | -19.157058350349338* | variable_bound mixed_binary |

fhnw-schedule-paira100 | open | 5150 | 5050 | 0 | 100 | 10000 | 29873 | Simon Felix | schedule | -15.1131226682367* | variable_bound mixed_binary |

nh97_potential | easy | 1180 | 630 | 328 | 222 | 1916 | 5748 | MIPLIB submission pool | -- | 1418 | benchmark_suitable mixed_binary general_linear |

pg | easy | 2700 | 100 | 0 | 2600 | 125 | 5200 | M. Dawande | -- | -8674.34260712 | benchmark decomposition benchmark_suitable mixed_binary |

pg5_34 | easy | 2600 | 100 | 0 | 2500 | 225 | 7700 | M. Dawande | -- | -14339.35345 | benchmark decomposition benchmark_suitable mixed_binary |

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Last Update Mai 20, 2021 by Philipp Wellner

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