{
  "split_used": "val_meta.jsonl (strictly zero test-set access)",
  "selected_alpha": 0.7,
  "selected_metrics": {
    "alpha": 0.7,
    "val_mcd_db": 4.387,
    "val_f0_cents": 531.2,
    "val_dur_mae_sec": 0.836,
    "val_sa_cer_pct": 13.83,
    "pareto_cost": 2.4018,
    "per_lang_mcd": {
      "sa": 4.622,
      "hi": 4.05,
      "kn": 4.128,
      "ta": 4.084,
      "te": 4.42,
      "ml": 4.403
    }
  },
  "sweep": [
    {
      "alpha": 0.0,
      "val_mcd_db": 5.423,
      "val_f0_cents": 683.1,
      "val_dur_mae_sec": 1.092,
      "val_sa_cer_pct": 22.15,
      "pareto_cost": 3.3423,
      "per_lang_mcd": {
        "sa": 5.37,
        "hi": 5.525,
        "kn": 5.495,
        "ta": 5.479,
        "te": 5.531,
        "ml": 5.279
      }
    },
    {
      "alpha": 0.25,
      "val_mcd_db": 5.032,
      "val_f0_cents": 600.8,
      "val_dur_mae_sec": 0.979,
      "val_sa_cer_pct": 15.21,
      "pareto_cost": 2.7137,
      "per_lang_mcd": {
        "sa": 5.043,
        "hi": 5.028,
        "kn": 5.114,
        "ta": 4.938,
        "te": 5.106,
        "ml": 4.934
      }
    },
    {
      "alpha": 0.4,
      "val_mcd_db": 4.81,
      "val_f0_cents": 570.3,
      "val_dur_mae_sec": 0.923,
      "val_sa_cer_pct": 13.33,
      "pareto_cost": 2.5066,
      "per_lang_mcd": {
        "sa": 4.87,
        "hi": 4.707,
        "kn": 4.853,
        "ta": 4.687,
        "te": 4.852,
        "ml": 4.733
      }
    },
    {
      "alpha": 0.55,
      "val_mcd_db": 4.586,
      "val_f0_cents": 547.8,
      "val_dur_mae_sec": 0.876,
      "val_sa_cer_pct": 13.2,
      "pareto_cost": 2.4231,
      "per_lang_mcd": {
        "sa": 4.718,
        "hi": 4.375,
        "kn": 4.528,
        "ta": 4.411,
        "te": 4.611,
        "ml": 4.529
      }
    },
    {
      "alpha": 0.7,
      "val_mcd_db": 4.387,
      "val_f0_cents": 531.2,
      "val_dur_mae_sec": 0.836,
      "val_sa_cer_pct": 13.83,
      "pareto_cost": 2.4018,
      "per_lang_mcd": {
        "sa": 4.622,
        "hi": 4.05,
        "kn": 4.128,
        "ta": 4.084,
        "te": 4.42,
        "ml": 4.403
      }
    },
    {
      "alpha": 0.85,
      "val_mcd_db": 4.259,
      "val_f0_cents": 524.4,
      "val_dur_mae_sec": 0.816,
      "val_sa_cer_pct": 17.86,
      "pareto_cost": 2.6341,
      "per_lang_mcd": {
        "sa": 4.593,
        "hi": 3.853,
        "kn": 3.821,
        "ta": 3.809,
        "te": 4.295,
        "ml": 4.308
      }
    },
    {
      "alpha": 1.0,
      "val_mcd_db": 4.23,
      "val_f0_cents": 514.3,
      "val_dur_mae_sec": 0.811,
      "val_sa_cer_pct": 24.29,
      "pareto_cost": 3.0492,
      "per_lang_mcd": {
        "sa": 4.618,
        "hi": 3.733,
        "kn": 3.786,
        "ta": 3.701,
        "te": 4.253,
        "ml": 4.276
      }
    }
  ]
}