{"abstract":"Candidates exactly on the score floor disappear.","category":"Vector retrieval ranking","checks":6,"contract":"Keep rows [id,score] when score is at least floor, preserving input order.","contract_signature":"rows, floor","evaluation_group":"vector-retrieval-threshold-inclusive","failed_approach":"An epsilon offset still excludes values exactly equal to the floor.","family":"w3-vector-retrieval-ranking-threshold-inclusive","id":"FA-99461","implementations":{"attempt":{"sha256":"2656413ba73515bd5327c295a1384038c51b84939a069525eed585ac2dd3c333","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(rows, floor):\n    return [r[0] for r in rows if r[1]>=floor+1e-9]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('exact boundary',solve([['edge',N],['above',N+1]],N),['edge','above'])\ncheck('boundary only',solve([['edge',N]],N),['edge'])\ncheck('negative floor',solve([['edge',-N],['low',-N-1]],-N),['edge'])\ncheck('fraction boundary',solve([['edge',1.25],['above',1.5]],1.25),['edge','above'])\ncheck('empty',solve([],N),[])\ncheck('all above',solve([['x',N+2],['y',N+3]],N),['x','y'])\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"795145ba7191a1404815d88ec6a382e9c66e66f66b8a97c24d0a7de92a0dcbaa","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(rows, floor):\n    return [r[0] for r in rows if r[1]>floor]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('exact boundary',solve([['edge',N],['above',N+1]],N),['edge','above'])\ncheck('boundary only',solve([['edge',N]],N),['edge'])\ncheck('negative floor',solve([['edge',-N],['low',-N-1]],-N),['edge'])\ncheck('fraction boundary',solve([['edge',1.25],['above',1.5]],1.25),['edge','above'])\ncheck('empty',solve([],N),[])\ncheck('all above',solve([['x',N+2],['y',N+3]],N),['x','y'])\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":"Inputs are small exact toy vectors and scores. No production index, ANN recall, embedding quality, or latency claim is implied. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"w3-vector-retrieval-ranking-threshold-inclusive","generated_at":"2026-09-30T16:48:24.474761+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"An offline vector retrieval toy model isolates one ranking contract from embedding generation, storage, and serving.","root_cause":"The cutoff uses a strict comparison.","sha256":"965cb3ac704d9839d87781a7804e56d51fafb41f6f4510e512e05b134ce4915e","title":"Vector retrieval: Candidates exactly on the score floor disappear · case 01","variant":1,"variant_policy":"The fixture code references N, supplied as 1 through 5. Fixed boundary checks may repeat. These records share one mechanism and must remain together in evaluation splits.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":27.909,"exit_code":1,"observations":[{"actual":["above"],"check":"exact boundary","expected":["edge","above"],"passed":false},{"actual":[],"check":"boundary only","expected":["edge"],"passed":false},{"actual":[],"check":"negative floor","expected":["edge"],"passed":false},{"actual":["above"],"check":"fraction boundary","expected":["edge","above"],"passed":false},{"actual":[],"check":"empty","expected":[],"passed":true},{"actual":["x","y"],"check":"all above","expected":["x","y"],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"exact boundary\", \"actual\": [\"above\"], \"expected\": [\"edge\", \"above\"], \"passed\": false}, {\"check\": \"boundary only\", \"actual\": [], \"expected\": [\"edge\"], \"passed\": false}, {\"check\": \"negative floor\", \"actual\": [], \"expected\": [\"edge\"], \"passed\": false}, {\"check\": \"fraction boundary\", \"actual\": [\"above\"], \"expected\": [\"edge\", \"above\"], \"passed\": false}, {\"check\": \"empty\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"all above\", \"actual\": [\"x\", \"y\"], \"expected\": [\"x\", \"y\"], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":27.825,"exit_code":1,"observations":[{"actual":["above"],"check":"exact boundary","expected":["edge","above"],"passed":false},{"actual":[],"check":"boundary only","expected":["edge"],"passed":false},{"actual":[],"check":"negative floor","expected":["edge"],"passed":false},{"actual":["above"],"check":"fraction boundary","expected":["edge","above"],"passed":false},{"actual":[],"check":"empty","expected":[],"passed":true},{"actual":["x","y"],"check":"all above","expected":["x","y"],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"exact boundary\", \"actual\": [\"above\"], \"expected\": [\"edge\", \"above\"], \"passed\": false}, {\"check\": \"boundary only\", \"actual\": [], \"expected\": [\"edge\"], \"passed\": false}, {\"check\": \"negative floor\", \"actual\": [], \"expected\": [\"edge\"], \"passed\": false}, {\"check\": \"fraction boundary\", \"actual\": [\"above\"], \"expected\": [\"edge\", \"above\"], \"passed\": false}, {\"check\": \"empty\", \"actual\": [], \"expected\": [], \"passed\": true}, {\"check\": \"all above\", \"actual\": [\"x\", \"y\"], \"expected\": [\"x\", \"y\"], \"passed\": true}], \"passed\": false}\n"}},"member_only":{"stages":["fixed"],"fields":["implementations.fixed","verification.fixed","harness","repair"],"note":"The verified repair, its recorded checks, the repair description, and the scoring harness are available to members."}}