Iteration final - SOLVER_EXECUTION
Sequence: 6
Timestamp: 2025-07-25 22:45:19

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

Response:
{
  "gurobipy": {
    "solver_type": "gurobipy",
    "execution_time": 0.21326684951782227,
    "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 17 rows, 10 columns and 35 nonzeros\nModel fingerprint: 0x4c8db857\nVariable types: 0 continuous, 10 integer (10 binary)\nCoefficient statistics:\n  Matrix range     [1e+00, 1e+00]\n  Objective range  [3e+00, 2e+01]\n  Bounds range     [1e+00, 1e+00]\n  RHS range        [3e+00, 5e+01]\nPresolve removed 6 rows and 0 columns\nPresolve time: 0.00s\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 0\nNo other solutions better than -1e+100\n\nModel is infeasible\nBest objective -, best bound -, gap -\nProblem is infeasible\n",
    "stderr": "",
    "status": "infeasible",
    "optimal_value": null,
    "error_message": "Problem is infeasible",
    "decision_variables": {},
    "retry_attempt": 4
  },
  "docplex": {
    "solver_type": "docplex",
    "execution_time": 1.0256924629211426,
    "return_code": 0,
    "stdout": "No solution found\nStatus: integer infeasible\n",
    "stderr": "",
    "status": "infeasible",
    "optimal_value": null,
    "error_message": "Problem is infeasible",
    "decision_variables": {},
    "retry_attempt": 4
  },
  "pyomo": {
    "solver_type": "pyomo",
    "execution_time": 0.7571032047271729,
    "return_code": 1,
    "stdout": "ERROR: Rule failed when generating expression for Constraint\nmax_songs_per_artist with index A5: ValueError: Invalid constraint expression.\nThe constraint expression resolved to a trivial Boolean (True) instead of a\nPyomo object. Please modify your rule to return Constraint.Feasible instead of\nTrue.\n\n    Error thrown for Constraint 'max_songs_per_artist[A5]'\nERROR: Constructing component 'max_songs_per_artist' from data=None failed:\n        ValueError: Invalid constraint expression. The constraint expression\n        resolved to a trivial Boolean (True) instead of a Pyomo object. Please\n        modify your rule to return Constraint.Feasible instead of True.\n\n    Error thrown for Constraint 'max_songs_per_artist[A5]'\n",
    "stderr": "Traceback (most recent call last):\n  File \"/tmp/tmpt88bxd9t.py\", line 108, in <module>\n    music_festival_optimization()\n  File \"/tmp/tmpt88bxd9t.py\", line 54, in music_festival_optimization\n    model.max_songs_per_artist = pyo.Constraint(model.ARTISTS, rule=max_songs_per_artist_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/indexed_component.py\", line 1111, in _setitem_when_not_present\n    obj.set_value(value)\n  File \"/dccstor/nl2opt/miniforge3/envs/nl2opt_optim/lib/python3.10/site-packages/pyomo/core/base/constraint.py\", line 469, in set_value\n    raise ValueError(\nValueError: Invalid constraint expression. The constraint expression resolved to a trivial Boolean (True) instead of a Pyomo object. Please modify your rule to return Constraint.Feasible instead of True.\n\nError thrown for Constraint 'max_songs_per_artist[A5]'\n",
    "status": "error",
    "optimal_value": null,
    "error_message": "Traceback (most recent call last):\n  File \"/tmp/tmpt88bxd9t.py\", line 108, in <module>\n    music_festival_optimization()\n  File \"/tmp/tmpt88bxd9t.py\", line 54, in music_festival_optimization\n    model.max_songs_per_artist = pyo.Constraint(model.ARTISTS, rule=max_songs_per_artist_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/indexed_component.py\", line 1111, in _setitem_when_not_present\n    obj.set_value(value)\n  File \"/dccstor/nl2opt/miniforge3/envs/nl2opt_optim/lib/python3.10/site-packages/pyomo/core/base/constraint.py\", line 469, in set_value\n    raise ValueError(\nValueError: Invalid constraint expression. The constraint expression resolved to a trivial Boolean (True) instead of a Pyomo object. Please modify your rule to return Constraint.Feasible instead of True.\n\nError thrown for Constraint 'max_songs_per_artist[A5]'\n",
    "decision_variables": {},
    "retry_attempt": 4
  }
}
