{
  "learned_temperature": 1.650000000000001,
  "selected_by": "ece_grid_on_fit_set",
  "grid": {
    "lo": 0.5,
    "hi": 20.000000000000018,
    "step": 0.05
  },
  "candidates": {
    "nll_optimal_T": 2.1000000000000014,
    "ece_optimal_T": 1.650000000000001,
    "brier_optimal_T": 1.700000000000001,
    "gap_zero_T": 1.750000000000001
  },
  "known_tradeoff": "★ ECE 最优的 T 会【过度校正】平均置信度（peak 口径非线性所致）：ECE 最优处 gap<0，gap=0 处 ECE 略高。两者用途不同，不是 bug。",
  "fit_n": 1399,
  "eval_n": 1399,
  "before": {
    "acc": 0.7019299499642602,
    "mean_conf": 0.816660356396593,
    "gap": 0.11473040643233279,
    "ece": 0.12728501762378236,
    "brier": 0.1746328467529055
  },
  "after": {
    "T": 1.650000000000001,
    "acc": 0.7019299499642602,
    "mean_conf": 0.7088651948607514,
    "gap": 0.006935244896491222,
    "ece": 0.05075217925967601,
    "brier": 0.15447520839714682
  },
  "evaluated_on_eval_set": {
    "未标定": {
      "T": 1.0,
      "acc": 0.7019299499642602,
      "mean_conf": 0.816660356396593,
      "gap": 0.11473040643233279,
      "ece": 0.12728501762378236,
      "brier": 0.1746328467529055
    },
    "NLL 最优": {
      "T": 2.1000000000000014,
      "acc": 0.7019299499642602,
      "mean_conf": 0.6337819371867018,
      "gap": -0.06814801277755833,
      "ece": 0.06985360079196457,
      "brier": 0.1592315759893245
    },
    "ECE 最优": {
      "T": 1.650000000000001,
      "acc": 0.7019299499642602,
      "mean_conf": 0.7088651948607514,
      "gap": 0.006935244896491222,
      "ece": 0.05075217925967601,
      "brier": 0.15447520839714682
    },
    "Brier 最优": {
      "T": 1.700000000000001,
      "acc": 0.7019299499642602,
      "mean_conf": 0.7004748391342072,
      "gap": -0.001455110830053008,
      "ece": 0.04773369963781429,
      "brier": 0.15426105938994958
    },
    "gap=0（置信无偏）": {
      "T": 1.750000000000001,
      "acc": 0.7019299499642602,
      "mean_conf": 0.692083567325022,
      "gap": -0.009846382639238205,
      "ece": 0.04852943644973566,
      "brier": 0.15423682907419622
    },
    "当前生效": {
      "T": 3.7500000000000027,
      "acc": 0.7019299499642602,
      "mean_conf": 0.4126402496230805,
      "gap": -0.2892897003411797,
      "ece": 0.2892897003411796,
      "brier": 0.2554843314346952
    }
  },
  "note": "在留出集的一半上按 ECE 网格搜索 T，另一半评估；准确率不变。★ 温度已回写进 .pt 的 meta（第 27 轮修复）。"
}