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Fixed-Depth Hierarchical Baseline in Strict-Parity Prerequisite Retrieval

The fixed-depth hierarchical baseline is a graph-aware comparator that traverses the prerequisite hierarchy with constant ancestor and descendant traversal depths (no per-query adaptation), in contrast to the paper's adaptive depth gating. It is included among the strict-parity baselines, so it shares the same encoder, m/km/k budgets, split, and exact-ID matching rule as the other compared systems. Because traversal depth is the only structural difference from adaptive depth gating, the fixed-depth baseline isolates the contribution of per-query depth adaptation in headline comparisons.

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Updated 2026-05-17

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Auditable Strict-Parity Evaluation of Prerequisite-Graph Retrieval for RAG under Leakage Controls