measure: BM25 lexical leg vs semseed baseline - net +2 (q10,q11), NOT-SHOWN

hit@5 68.6% -> 74.3%, phrase 71.4% -> 100%, MRR@10 0.461 -> 0.502, latency p50 0.97x. Zero losses, zero run-to-run drift on both sides. 2 queries moved against a 6-query noise floor: NO MEASURABLE DIFFERENCE by the harness's own test (McNemar exact p=0.50). Unaddressable records in returned slots: 57 -> 0. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
2026-08-07 15:55:42 -05:00
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commit 55f9ee3cb0
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+{
+ "baseline": "semseed",
+ "candidate": "bm25lex",
+ "n_shared_queries": 38,
+ "fixed_by_candidate": [
+  "q10",
+  "q11"
+ ],
+ "broken_by_candidate": [],
+ "discordant": 2,
+ "net_queries": 2,
+ "mcnemar_exact_p": 0.5,
+ "min_detectable_swing_queries": 6,
+ "observed_run_to_run_drift_queries": 0,
+ "noise_floor_queries": 6,
+ "verdict": "no measurable difference",
+ "baseline_aggregate": {
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+  "n_scored": 35,
+  "hit@5": 0.6857142857142857,
+  "recall@5": 0.5213459159887731,
+  "recall@10": 0.6027048348476919,
+  "precision@5": 0.18285714285714294,
+  "mrr@10": 0.4608730158730158,
+  "nonsense_clean": "2/3",
+  "superseded_outranks": "2/3",
+  "latency_ms_p50": 1227.1,
+  "latency_ms_p95": 1692.6,
+  "latency_ms_max": 1710.4,
+  "errors": 0,
+  "by_category": {
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+    "hit@5": 0.6666666666666666,
+    "recall@5": 0.07342657342657344,
+    "recall@10": 0.24825174825174823,
+    "mrr@10": 0.20833333333333334
+   },
+   "exact_rare": {
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+    "hit@5": 1.0,
+    "recall@5": 1.0,
+    "recall@10": 1.0,
+    "mrr@10": 1.0
+   },
+   "nonsense": {
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+    "clean": 2,
+    "avg_false_positives": 3.3333333333333335
+   },
+   "paraphrase": {
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+    "recall@5": 0.6153846153846154,
+    "recall@10": 0.6153846153846154,
+    "mrr@10": 0.2846153846153846
+   },
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+    "mrr@10": 0.6507936507936508
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+    "outranks": 2
+   }
+  }
+ },
+ "candidate_aggregate": {
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+  "n_scored": 35,
+  "hit@5": 0.7428571428571429,
+  "recall@5": 0.5536485340056769,
+  "recall@10": 0.6175677497106068,
+  "precision@5": 0.20000000000000007,
+  "mrr@10": 0.5021428571428571,
+  "nonsense_clean": "2/3",
+  "superseded_outranks": "2/3",
+  "latency_ms_p50": 1184.4,
+  "latency_ms_p95": 1620.0,
+  "latency_ms_max": 1655.4,
+  "errors": 0,
+  "by_category": {
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+    "recall@10": 0.23310023310023312,
+    "mrr@10": 0.25
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+    "hit@5": 1.0,
+    "recall@5": 1.0,
+    "recall@10": 1.0,
+    "mrr@10": 1.0
+   },
+   "nonsense": {
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+    "clean": 2,
+    "avg_false_positives": 3.3333333333333335
+   },
+   "paraphrase": {
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+    "recall@10": 0.6153846153846154,
+    "mrr@10": 0.2846153846153846
+   },
+   "phrase": {
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+    "recall@5": 0.5494614512471656,
+    "recall@10": 0.6023242630385487,
+    "mrr@10": 0.8214285714285714
+   },
+   "superseded": {
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+    "hit@5": 0.3333333333333333,
+    "recall@5": 0.3333333333333333,
+    "recall@10": 0.6666666666666666,
+    "mrr@10": 0.20833333333333334,
+    "outranks": 2
+   }
+  }
+ },
+ "repeat_variance": {
+  "baseline": {
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+   "hit@5_min": 0.6857142857142857,
+   "hit@5_max": 0.6857142857142857,
+   "spread_queries": 0
+  },
+  "candidate": {
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+   "hit@5_min": 0.7428571428571429,
+   "hit@5_max": 0.7428571428571429,
+   "spread_queries": 0
+  }
+ }
+}