Iteration final - SOLVER_EXECUTION
Sequence: 6
Timestamp: 2025-07-27 23:53:52

Prompt:
Generated solver codes with templates and executed them with retry logic

Response:
{
  "gurobipy": {
    "solver_type": "gurobipy",
    "execution_time": 0.6143777370452881,
    "return_code": 0,
    "stdout": "Restricted license - for non-production use only - expires 2026-11-23\nGurobi Optimizer version 12.0.2 build v12.0.2rc0 (linux64 - \"Red Hat Enterprise Linux 9.4 (Plow)\")\n\nCPU model: AMD EPYC 7513 32-Core Processor, instruction set [SSE2|AVX|AVX2]\nThread count: 64 physical cores, 128 logical processors, using up to 32 threads\n\nOptimize a model with 15 rows, 9 columns and 27 nonzeros\nModel fingerprint: 0x38b7ad31\nVariable types: 0 continuous, 9 integer (9 binary)\nCoefficient statistics:\n  Matrix range     [1e+00, 1e+00]\n  Objective range  [2e+02, 4e+02]\n  Bounds range     [1e+00, 1e+00]\n  RHS range        [1e+00, 5e+00]\nFound heuristic solution: objective 600.0000000\nPresolve removed 15 rows and 9 columns\nPresolve time: 0.00s\nPresolve: All rows and columns removed\n\nExplored 0 nodes (0 simplex iterations) in 0.00 seconds (0.00 work units)\nThread count was 1 (of 128 available processors)\n\nSolution count 2: 700 600 \n\nOptimal solution found (tolerance 1.00e-04)\nBest objective 7.000000000000e+02, best bound 7.000000000000e+02, gap 0.0000%\nOptimal value: 700.0\nTrain 101 assigned to Station 2 with demand 300\nTrain 102 assigned to Station 3 with demand 400\n",
    "stderr": "",
    "status": "optimal",
    "optimal_value": 700.0,
    "error_message": null,
    "decision_variables": {}
  },
  "docplex": {
    "solver_type": "docplex",
    "execution_time": 3.4282500743865967,
    "return_code": 0,
    "stdout": "Optimal value: 700.0\nx[101,2] = 1.000\nx[102,3] = 1.000\n",
    "stderr": "",
    "status": "optimal",
    "optimal_value": 700.0,
    "error_message": null,
    "decision_variables": {}
  },
  "pyomo": {
    "solver_type": "pyomo",
    "execution_time": 1.8065073490142822,
    "return_code": 1,
    "stdout": "ERROR: Rule failed when generating expression for Constraint\nservice_compatibility_constraint with index (101, 1): TypeError: '<=' not\nsupported between instances of 'VarData' and 'bool'\nERROR: Constructing component 'service_compatibility_constraint' from\ndata=None failed:\n        TypeError: '<=' not supported between instances of 'VarData' and\n        'bool'\n",
    "stderr": "Traceback (most recent call last):\n  File \"/tmp/tmpq4jplxlt.py\", line 104, in <module>\n    train_station_optimization()\n  File \"/tmp/tmpq4jplxlt.py\", line 69, in train_station_optimization\n    model.service_compatibility_constraint = pyo.Constraint(model.Trains, model.Stations, rule=service_compatibility_rule)\n  File \"/dccstor/nl2opt/miniforge3/envs/nl2opt_optim/lib/python3.10/site-packages/pyomo/core/base/block.py\", line 571, in __setattr__\n    self.add_component(name, val)\n  File \"/dccstor/nl2opt/miniforge3/envs/nl2opt_optim/lib/python3.10/site-packages/pyomo/core/base/block.py\", line 1101, in add_component\n    val.construct(data)\n  File \"/dccstor/nl2opt/miniforge3/envs/nl2opt_optim/lib/python3.10/site-packages/pyomo/core/base/constraint.py\", line 722, in construct\n    self._setitem_when_not_present(index, rule(block, index))\n  File \"/dccstor/nl2opt/miniforge3/envs/nl2opt_optim/lib/python3.10/site-packages/pyomo/core/base/initializer.py\", line 349, in __call__\n    return self._fcn(parent, *idx)\n  File \"/tmp/tmpq4jplxlt.py\", line 68, in service_compatibility_rule\n    return model.x[i, j] <= model.Compatible[i, j]\nTypeError: '<=' not supported between instances of 'VarData' and 'bool'\n",
    "status": "error",
    "optimal_value": null,
    "error_message": "Traceback (most recent call last):\n  File \"/tmp/tmpq4jplxlt.py\", line 104, in <module>\n    train_station_optimization()\n  File \"/tmp/tmpq4jplxlt.py\", line 69, in train_station_optimization\n    model.service_compatibility_constraint = pyo.Constraint(model.Trains, model.Stations, rule=service_compatibility_rule)\n  File \"/dccstor/nl2opt/miniforge3/envs/nl2opt_optim/lib/python3.10/site-packages/pyomo/core/base/block.py\", line 571, in __setattr__\n    self.add_component(name, val)\n  File \"/dccstor/nl2opt/miniforge3/envs/nl2opt_optim/lib/python3.10/site-packages/pyomo/core/base/block.py\", line 1101, in add_component\n    val.construct(data)\n  File \"/dccstor/nl2opt/miniforge3/envs/nl2opt_optim/lib/python3.10/site-packages/pyomo/core/base/constraint.py\", line 722, in construct\n    self._setitem_when_not_present(index, rule(block, index))\n  File \"/dccstor/nl2opt/miniforge3/envs/nl2opt_optim/lib/python3.10/site-packages/pyomo/core/base/initializer.py\", line 349, in __call__\n    return self._fcn(parent, *idx)\n  File \"/tmp/tmpq4jplxlt.py\", line 68, in service_compatibility_rule\n    return model.x[i, j] <= model.Compatible[i, j]\nTypeError: '<=' not supported between instances of 'VarData' and 'bool'\n",
    "decision_variables": {}
  }
}
