{
  "instance_id": "knapsack_medium_s123",
  "problem_type": "knapsack",
  "size": "medium",
  "winner": "cp_sat",
  "oracle_solver": "cp_sat",
  "selector_accuracy": true,
  "par10_score": 0.073,
  "oracle_regret": 0.0,
  "results": [
    {
      "solver_id": "cp_sat",
      "solver_config": {
        "time_limit_sec": 10.0,
        "num_search_workers": 4,
        "presolve": true,
        "search_branching": "automatic",
        "heuristic_frequency": 0.5
      },
      "instance_id": "knapsack_medium_s123",
      "problem_type": "knapsack",
      "metrics": {
        "runtime_sec": 0.0218,
        "optimality_gap_pct": 0,
        "feasible": true,
        "time_to_first_feasible_sec": 0.0076,
        "best_bound": 919.08,
        "gap_improvement_rate": 0.15,
        "search_speed": 1374.68,
        "objective_value": 1118.0,
        "status": "OPTIMAL",
        "memory_mb": 0.03,
        "nodes": 0
      },
      "solution": {}
    },
    {
      "solver_id": "highs",
      "solver_config": {
        "time_limit_sec": 10.0,
        "presolve": "on",
        "threads": 4,
        "mip_rel_gap": 0.01,
        "cut_strategy": "automatic"
      },
      "instance_id": "knapsack_medium_s123",
      "problem_type": "knapsack",
      "metrics": {
        "runtime_sec": 0.08,
        "optimality_gap_pct": 2.06,
        "feasible": true,
        "time_to_first_feasible_sec": 0.0211,
        "best_bound": 909.6135,
        "gap_improvement_rate": 0.206,
        "search_speed": 375.0,
        "objective_value": 915.8632,
        "status": "FEASIBLE",
        "memory_mb": 12.06,
        "nodes": 83
      },
      "solution": {}
    },
    {
      "solver_id": "cbc",
      "solver_config": {
        "time_limit_sec": 10.0,
        "presolve": "on",
        "cuts": "on",
        "heuristics": "on",
        "threads": 2
      },
      "instance_id": "knapsack_medium_s123",
      "problem_type": "knapsack",
      "metrics": {
        "runtime_sec": 0.08,
        "optimality_gap_pct": 2.3,
        "feasible": true,
        "time_to_first_feasible_sec": 0.0216,
        "best_bound": 908.5106,
        "gap_improvement_rate": 0.23,
        "search_speed": 375.0,
        "objective_value": 914.4846,
        "status": "FEASIBLE",
        "memory_mb": 12.06,
        "nodes": 81
      },
      "solution": {}
    },
    {
      "solver_id": "scip",
      "solver_config": {
        "time_limit_sec": 10.0,
        "presolving": true,
        "separating": true,
        "heuristics": true,
        "threads": 4
      },
      "instance_id": "knapsack_medium_s123",
      "problem_type": "knapsack",
      "metrics": {
        "runtime_sec": 0.08,
        "optimality_gap_pct": 1.98,
        "feasible": true,
        "time_to_first_feasible_sec": 0.021,
        "best_bound": 909.9811,
        "gap_improvement_rate": 0.198,
        "search_speed": 375.0,
        "objective_value": 916.3228,
        "status": "FEASIBLE",
        "memory_mb": 12.06,
        "nodes": 84
      },
      "solution": {}
    },
    {
      "solver_id": "glpk",
      "solver_config": {
        "time_limit_sec": 10.0,
        "presolve": true,
        "mip_gap": 0.02
      },
      "instance_id": "knapsack_medium_s123",
      "problem_type": "knapsack",
      "metrics": {
        "runtime_sec": 0.08,
        "optimality_gap_pct": 3.74,
        "feasible": true,
        "time_to_first_feasible_sec": 0.0245,
        "best_bound": 901.8932,
        "gap_improvement_rate": 0.374,
        "search_speed": 375.0,
        "objective_value": 906.2129,
        "status": "FEASIBLE",
        "memory_mb": 12.06,
        "nodes": 64
      },
      "solution": {}
    },
    {
      "solver_id": "gurobi",
      "solver_config": {
        "time_limit_sec": 10.0,
        "Presolve": 2,
        "MIPFocus": 1,
        "Heuristics": 0.25,
        "Threads": 4
      },
      "instance_id": "knapsack_medium_s123",
      "problem_type": "knapsack",
      "metrics": {
        "runtime_sec": 0.08,
        "optimality_gap_pct": 1.66,
        "feasible": true,
        "time_to_first_feasible_sec": 0.0203,
        "best_bound": 911.4516,
        "gap_improvement_rate": 0.166,
        "search_speed": 375.0,
        "objective_value": 918.1609,
        "status": "FEASIBLE",
        "memory_mb": 12.06,
        "nodes": 88
      },
      "solution": {}
    },
    {
      "solver_id": "minizinc",
      "solver_config": {
        "time_limit_sec": 10.0,
        "solver": "chuffed",
        "neighborhood_size": 12
      },
      "instance_id": "knapsack_medium_s123",
      "problem_type": "knapsack",
      "metrics": {
        "runtime_sec": 0.08,
        "optimality_gap_pct": 3.9,
        "feasible": true,
        "time_to_first_feasible_sec": 0.0248,
        "best_bound": 901.1579,
        "gap_improvement_rate": 0.39,
        "search_speed": 375.0,
        "objective_value": 905.2938,
        "status": "FEASIBLE",
        "memory_mb": 12.06,
        "nodes": 63
      },
      "solution": {}
    },
    {
      "solver_id": "alns",
      "solver_config": {
        "time_limit_sec": 10.0,
        "neighborhood_size": 24,
        "destroy_pct": 0.3,
        "initial_solution": "greedy"
      },
      "instance_id": "knapsack_medium_s123",
      "problem_type": "knapsack",
      "metrics": {
        "runtime_sec": 0.08,
        "optimality_gap_pct": 4.7,
        "feasible": true,
        "time_to_first_feasible_sec": 0.0264,
        "best_bound": 897.4816,
        "gap_improvement_rate": 0.47,
        "search_speed": 375.0,
        "objective_value": 900.6984,
        "status": "FEASIBLE",
        "memory_mb": 12.06,
        "nodes": 54
      },
      "solution": {}
    }
  ],
  "instance_features": {
    "general": {
      "n_variables": 30,
      "n_constraints": 1,
      "pct_binary": 1.0,
      "pct_integer": 1.0,
      "sparsity": 0.0,
      "coefficient_range": 95,
      "constraint_tightness": 1.5025
    },
    "graph": {
      "graph_density": 0.0,
      "clustering_coefficient": 0.0,
      "avg_degree": 0.0,
      "connected_components": 1,
      "treewidth_approx": 1.0
    },
    "problem": {
      "n_machines": 0,
      "n_jobs": 30,
      "capacity_utilization": 3.005,
      "customer_clustering": 0.0,
      "demand_variance": 0.0,
      "time_window_tightness": 0.0
    }
  }
}