{"abstract":"short duplicate fragment fails containment test.","category":"Dataset deduplication grouping","checks":6,"contract":"Return overlap coefficient: intersection size divided by smaller set size; two empty sets score 1.","contract_signature":"a, b","evaluation_group":"dedup-overlap-coefficient","failed_approach":"Normalizing by the larger size makes a short subset look weakly related.","family":"w3-dataset-deduplication-grouping-containment-direction","id":"FA-100306","implementations":{"attempt":{"sha256":"6d15ccd915d27b2cbf9e0342d982885b83602a5d178f40ed17da9a4e3b2c9cfd","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(a, b):\n    u=set(a); v=set(b); return len(u&v)/len(u) if u else (1 if not v else 0)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('left contained',solve(['a'],['a','b','c']),1)\ncheck('right contained',solve(['a','b','c'],['a']),1)\ncheck('partial smaller coverage',solve(['a','b'],['a','c','d']),0.5)\ncheck('disjoint',solve(['a'],['b']),0)\ncheck('both empty',solve([],[]),1)\ncheck('one empty',solve([],['a']),0)\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":"d14b1543caa8ec4d1257de44404e705e6281291b9c468dcfd3de0efd864599e6","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(a, b):\n    u=set(a); v=set(b); return len(u&v)/max(len(u),len(v)) if u or v else 1\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('left contained',solve(['a'],['a','b','c']),1)\ncheck('right contained',solve(['a','b','c'],['a']),1)\ncheck('partial smaller coverage',solve(['a','b'],['a','c','d']),0.5)\ncheck('disjoint',solve(['a'],['b']),0)\ncheck('both empty',solve([],[]),1)\ncheck('one empty',solve([],['a']),0)\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 in-memory fixtures with the stated contract; results do not claim production deduplication quality. 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-dataset-deduplication-grouping-containment-direction","generated_at":"2026-09-30T16:48:34.013956+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"This deterministic toy operation makes one dataset equivalence or representative rule explicit.","root_cause":"The containment score divides by the larger document size.","sha256":"52d61e34613ec0923c4d162b7988b285be8207adfe7ab280ac917d707d0a72bc","title":"Dataset deduplication: short duplicate fragment fails containment test · case 01","variant":1,"variant_policy":"The same explicitly authored fixtures repeat across all five numbered records; runtime N is unused. These records share one mechanism and must remain together in evaluation splits.","verified":true,"visibility":"public","verification":{"attempt":{"elapsed_ms":29.092,"exit_code":1,"observations":[{"actual":1.0,"check":"left contained","expected":1,"passed":true},{"actual":0.3333333333333333,"check":"right contained","expected":1,"passed":false},{"actual":0.5,"check":"partial smaller coverage","expected":0.5,"passed":true},{"actual":0.0,"check":"disjoint","expected":0,"passed":true},{"actual":1,"check":"both empty","expected":1,"passed":true},{"actual":0,"check":"one empty","expected":0,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"left contained\", \"actual\": 1.0, \"expected\": 1, \"passed\": true}, {\"check\": \"right contained\", \"actual\": 0.3333333333333333, \"expected\": 1, \"passed\": false}, {\"check\": \"partial smaller coverage\", \"actual\": 0.5, \"expected\": 0.5, \"passed\": true}, {\"check\": \"disjoint\", \"actual\": 0.0, \"expected\": 0, \"passed\": true}, {\"check\": \"both empty\", \"actual\": 1, \"expected\": 1, \"passed\": true}, {\"check\": \"one empty\", \"actual\": 0, \"expected\": 0, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":28.352,"exit_code":1,"observations":[{"actual":0.3333333333333333,"check":"left contained","expected":1,"passed":false},{"actual":0.3333333333333333,"check":"right contained","expected":1,"passed":false},{"actual":0.3333333333333333,"check":"partial smaller coverage","expected":0.5,"passed":false},{"actual":0.0,"check":"disjoint","expected":0,"passed":true},{"actual":1,"check":"both empty","expected":1,"passed":true},{"actual":0.0,"check":"one empty","expected":0,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"left contained\", \"actual\": 0.3333333333333333, \"expected\": 1, \"passed\": false}, {\"check\": \"right contained\", \"actual\": 0.3333333333333333, \"expected\": 1, \"passed\": false}, {\"check\": \"partial smaller coverage\", \"actual\": 0.3333333333333333, \"expected\": 0.5, \"passed\": false}, {\"check\": \"disjoint\", \"actual\": 0.0, \"expected\": 0, \"passed\": true}, {\"check\": \"both empty\", \"actual\": 1, \"expected\": 1, \"passed\": true}, {\"check\": \"one empty\", \"actual\": 0.0, \"expected\": 0, \"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."}}