Record EasyCom loss structure ablation

2026-08-26 16:30:48 +08:00
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@@ -147,6 +147,19 @@ Treat this as a capacity ablation. If it improves, compare it against a
 parameter-matched single-layer MLP and use stronger regularization or a clean
 development session before attributing the gain to cross-layer fusion.

+#### Four-epoch loss-structure ablation
+
+Using the same frozen 8-second last-4 stack and concat-MLP readout, a
+three-seed fixed-budget comparison tested LSTR-MCE, independent sigmoid/BCE,
+and four-state softmax. All nine training sessions were used for exactly four
+epochs with no development set. On the causal-valid test metric, no objective
+is a decisive winner: BCE has the highest mean mAP (`60.91733`), while
+four-state CE has the highest 0.2-second wearer AP (`78.72040`). Relative to
+LSTR-MCE, both alternatives slightly improve the two speech classes while
+reducing background AP. The full protocol, per-seed summary, seed-0 horizon
+curves, and machine-readable data are archived in
+[`results/easycom_loss_structure_4ep_2026-08-26/`](results/easycom_loss_structure_4ep_2026-08-26/README.md).
+
 ## Current Ego4D context-length results

 The following single-seed snapshot was recorded on 2026-08-22. Both variants