Iteration final - SOLVER_EXECUTION
Sequence: 6
Timestamp: 2025-07-25 22:30:48

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

Response:
{
  "gurobipy": {
    "solver_type": "gurobipy",
    "execution_time": 0.17636942863464355,
    "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 5 rows, 3 columns and 15 nonzeros\nModel fingerprint: 0x9fa1ce4c\nVariable types: 0 continuous, 3 integer (3 binary)\nCoefficient statistics:\n  Matrix range     [1e+00, 7e+01]\n  Objective range  [2e+01, 4e+01]\n  Bounds range     [1e+00, 1e+00]\n  RHS range        [1e+01, 2e+02]\nFound heuristic solution: objective 97.5000000\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 1: 97.5 \n\nOptimal solution found (tolerance 1.00e-04)\nBest objective 9.750000000000e+01, best bound 9.750000000000e+01, gap 0.0000%\nOptimal value: 97.5\nFarm 1 is invited.\nFarm 2 is invited.\nFarm 3 is invited.\n",
    "stderr": "",
    "status": "optimal",
    "optimal_value": 97.5,
    "error_message": null,
    "decision_variables": {}
  },
  "docplex": {
    "solver_type": "docplex",
    "execution_time": 1.0018391609191895,
    "return_code": 0,
    "stdout": "Optimal value: 97.5\nFarm 1 is invited: 1\nFarm 2 is invited: 1\nFarm 3 is invited: 1\n",
    "stderr": "",
    "status": "optimal",
    "optimal_value": 97.5,
    "error_message": null,
    "decision_variables": {}
  },
  "pyomo": {
    "solver_type": "pyomo",
    "execution_time": 0.8329043388366699,
    "return_code": 1,
    "stdout": "ERROR: Rule failed when generating expression for Objective objective with\nindex None: TypeError: 'LinearExpression' object is not iterable\nERROR: Constructing component 'objective' from data=None failed:\n        TypeError: 'LinearExpression' object is not iterable\n",
    "stderr": "Traceback (most recent call last):\n  File \"/tmp/tmp8cz1ew2l.py\", line 112, in <module>\n    farm_selection_optimization()\n  File \"/tmp/tmp8cz1ew2l.py\", line 56, in farm_selection_optimization\n    model.objective = pyo.Objective(rule=obj_rule, sense=pyo.maximize)\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/objective.py\", line 336, in construct\n    ans = 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 485, in __call__\n    return self._fcn(parent)\n  File \"/tmp/tmp8cz1ew2l.py\", line 55, in obj_rule\n    return sum(24 * model.x[1] + 32.5 * model.x[2] + 41 * model.x[3])\nTypeError: 'LinearExpression' object is not iterable\n",
    "status": "error",
    "optimal_value": null,
    "error_message": "Traceback (most recent call last):\n  File \"/tmp/tmp8cz1ew2l.py\", line 112, in <module>\n    farm_selection_optimization()\n  File \"/tmp/tmp8cz1ew2l.py\", line 56, in farm_selection_optimization\n    model.objective = pyo.Objective(rule=obj_rule, sense=pyo.maximize)\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/objective.py\", line 336, in construct\n    ans = 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 485, in __call__\n    return self._fcn(parent)\n  File \"/tmp/tmp8cz1ew2l.py\", line 55, in obj_rule\n    return sum(24 * model.x[1] + 32.5 * model.x[2] + 41 * model.x[3])\nTypeError: 'LinearExpression' object is not iterable\n",
    "decision_variables": {}
  }
}
