{"abstract":"a wildcard axis masks mismatches in fixed axes.","category":"Checkpoint tensor mapping","checks":6,"contract":"A template dimension -1 accepts any nonnegative extent at that position; other axes must match.","contract_signature":"actual, template","evaluation_group":"w3-checkpoint-tensor-mapping-shape-wildcard","failed_approach":"Allowing an actual -1 treats metadata as a template and accepts an unresolved shape.","family":"w3-checkpoint-tensor-mapping-shape-wildcard","id":"FA-99151","implementations":{"attempt":{"sha256":"4e88a33be6aecaf0436183e634898ced9725d450d9dd52a7bae9714b6ede4be9","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(actual, template):\n    return len(actual)==len(template) and all(b==-1 or a==b or a==-1 for a,b in zip(actual,template))\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('declared', solve(*([3, 4], [3, -1])), True)\ncheck('wrong fixed', solve(*([4, 4], [3, -1])), False)\ncheck('actual wildcard', solve(*([-1, 4], [3, -1])), False)\ncheck('rank', solve(*([3], [3, -1])), False)\ncheck('empty', solve(*([], [])), True)\ncheck('negative at wildcard', solve(*([3, -1], [3, -1])), False)\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":"c4d1630d8288edcfebffea08ebb43430f5f68e364dcc28015b4deca379b7c699","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(actual, template):\n    return len(actual)==len(template) and all(a==b or -1 in template for a,b in zip(actual,template))\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('declared', solve(*([3, 4], [3, -1])), True)\ncheck('wrong fixed', solve(*([4, 4], [3, -1])), False)\ncheck('actual wildcard', solve(*([-1, 4], [3, -1])), False)\ncheck('rank', solve(*([3], [3, -1])), False)\ncheck('empty', solve(*([], [])), True)\ncheck('negative at wildcard', solve(*([3, -1], [3, -1])), False)\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 already decoded Python values; this toy contract makes no claim about a framework, file format, or production checkpoint. 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-checkpoint-tensor-mapping-shape-wildcard","generated_at":"2026-09-30T16:48:20.799442+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"A bounded offline model of checkpoint tensor bookkeeping in a training workflow.","root_cause":"Wildcard presence anywhere bypasses all fixed-axis comparisons.","sha256":"91bc99be8e9be25eec85793f39591f43009663b74986964821b5b3f61fa2355c","title":"Checkpoint mapping: a wildcard axis masks mismatches in fixed axes · 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":26.897,"exit_code":1,"observations":[{"actual":true,"check":"declared","expected":true,"passed":true},{"actual":false,"check":"wrong fixed","expected":false,"passed":true},{"actual":true,"check":"actual wildcard","expected":false,"passed":false},{"actual":false,"check":"rank","expected":false,"passed":true},{"actual":true,"check":"empty","expected":true,"passed":true},{"actual":true,"check":"negative at wildcard","expected":false,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"declared\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"wrong fixed\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"actual wildcard\", \"actual\": true, \"expected\": false, \"passed\": false}, {\"check\": \"rank\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"empty\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"negative at wildcard\", \"actual\": true, \"expected\": false, \"passed\": false}], \"passed\": false}\n"},"broken":{"elapsed_ms":28.094,"exit_code":1,"observations":[{"actual":true,"check":"declared","expected":true,"passed":true},{"actual":true,"check":"wrong fixed","expected":false,"passed":false},{"actual":true,"check":"actual wildcard","expected":false,"passed":false},{"actual":false,"check":"rank","expected":false,"passed":true},{"actual":true,"check":"empty","expected":true,"passed":true},{"actual":true,"check":"negative at wildcard","expected":false,"passed":false}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"declared\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"wrong fixed\", \"actual\": true, \"expected\": false, \"passed\": false}, {\"check\": \"actual wildcard\", \"actual\": true, \"expected\": false, \"passed\": false}, {\"check\": \"rank\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"empty\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"negative at wildcard\", \"actual\": true, \"expected\": false, \"passed\": false}], \"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."}}