{
  "record": "easycom_track_gru_residual_4ep_2026-09-07",
  "dataset": "easycom",
  "global_features": "open_stream_2fps_8s_last4_stack",
  "local_features": "local_qwen_1s_encoded_tf4576",
  "train_sessions": [4, 5, 6, 7, 8, 9, 10, 11],
  "dev_sessions": [12],
  "test_sessions": [1, 2, 3],
  "epochs": 4,
  "loss": "lstr-mce",
  "layer_fusion": "concat-mlp",
  "person_history_frames": 16,
  "person_history_fps": 2.0,
  "person_track_max_gap_seconds": 1.0,
  "protocol": "causal_valid_only",
  "units": "percentage_points",
  "dev": {
    "seeds": [0, 1, 2],
    "paired_delta_track_minus_pooled": {
      "map_0p2": {"mean": 0.00918, "sample_std": 0.01429},
      "bg_ap_0p2": {"mean": -0.03206, "sample_std": 0.06281},
      "wearer_ap_0p2": {"mean": 0.07930, "sample_std": 0.13610},
      "others_ap_0p2": {"mean": -0.01969, "sample_std": 0.03062},
      "mean_map": {"mean": 0.01306, "sample_std": 0.02368}
    }
  },
  "test_audit": {
    "seeds": [0],
    "pooled": {
      "map_0p2": 81.74161,
      "bg_ap_0p2": 68.57326,
      "wearer_ap_0p2": 84.71790,
      "others_ap_0p2": 91.93366,
      "mean_map": 64.88810,
      "full_timeline_mean_map": 64.87493
    },
    "track_gru": {
      "map_0p2": 81.74160,
      "bg_ap_0p2": 68.57367,
      "wearer_ap_0p2": 84.71783,
      "others_ap_0p2": 91.93330,
      "mean_map": 64.88780,
      "full_timeline_mean_map": 64.87463
    },
    "paired_delta_track_minus_pooled": {
      "map_0p2": -0.00001,
      "bg_ap_0p2": 0.00041,
      "wearer_ap_0p2": -0.00007,
      "others_ap_0p2": -0.00037,
      "mean_map": -0.00030
    },
    "warning": "Observed before diagnosing residual optimization; do not use to tune the corrected architecture."
  },
  "selected_track_checkpoints": [
    {"seed": 0, "best_epoch": 1, "saved_tanh_gate": -0.0015261819353327155, "selection_dev_mean_map": 0.5945069810061214},
    {"seed": 1, "best_epoch": 1, "saved_tanh_gate": 0.004098099190741777, "selection_dev_mean_map": 0.5952841235072595},
    {"seed": 2, "best_epoch": 2, "saved_tanh_gate": 0.010815753601491451, "selection_dev_mean_map": 0.5959213772894789}
  ],
  "decision": "No meaningful gain. Treat as a zero-gate optimization failure, not evidence against track continuity.",
  "next_step": "Remove scalar gate, zero-initialize the final residual layer, verify nonzero branch gradients, and screen only on Session 12."
}