{"abstract":"contiguity ignores strides on unit axes.","category":"Tensor stride and reshape semantics","checks":6,"contract":"Dense row-major contiguity checks expected stride only for dimensions larger than one.","contract_signature":"shape, strides","evaluation_group":"tensor-contiguous-test","failed_approach":"Requiring progression through singleton axes rejects layouts whose addresses are unaffected by those strides.","family":"w3-tensor-stride-reshape-contiguous-test","id":"FA-98816","implementations":{"attempt":{"sha256":"ebccc05e0f3f941997a11bf7b5e14119956757d2580c6064e738ce795fd3a482","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(shape, strides):\n    expected=1\n    for d,s in zip(reversed(shape),reversed(strides)):\n     if s!=expected: return False\n     expected*=d\n    return True\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('contiguous',solve([2,3],[3,1]),True)\ncheck('transposed',solve([2,3],[1,2]),False)\ncheck('unit arbitrary',solve([1,3],[99,1]),True)\ncheck('scalar',solve([],[]),True)\ncheck('all singleton',solve([1,1],[7,0]),True)\ncheck('gap',solve([2,3],[4,1]),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":"97833b8004d69dffe3c595aafe1814c5a42d925955f9c5fde5d31906bd0be521","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(shape, strides):\n    return all(s==1 for s in strides)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('contiguous',solve([2,3],[3,1]),True)\ncheck('transposed',solve([2,3],[1,2]),False)\ncheck('unit arbitrary',solve([1,3],[99,1]),True)\ncheck('scalar',solve([],[]),True)\ncheck('all singleton',solve([1,1],[7,0]),True)\ncheck('gap',solve([2,3],[4,1]),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":"Self-contained integer metadata models only; no production framework compatibility or performance claim. 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-tensor-stride-reshape-contiguous-test","generated_at":"2026-09-30T16:48:17.165394+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"Dense tensor views rely on consistent logical coordinates and physical storage addresses.","root_cause":"Contiguity depends on stride progression for non-singleton axes, not every stored stride value.","sha256":"a509739eadea5ec57dc9bfa3e6012042bad15c23a53c5c06119db041b8ffb757","title":"Tensor views: contiguity ignores strides on unit 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":26.508,"exit_code":1,"observations":[{"actual":true,"check":"contiguous","expected":true,"passed":true},{"actual":false,"check":"transposed","expected":false,"passed":true},{"actual":false,"check":"unit arbitrary","expected":true,"passed":false},{"actual":true,"check":"scalar","expected":true,"passed":true},{"actual":false,"check":"all singleton","expected":true,"passed":false},{"actual":false,"check":"gap","expected":false,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"contiguous\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"transposed\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"unit arbitrary\", \"actual\": false, \"expected\": true, \"passed\": false}, {\"check\": \"scalar\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"all singleton\", \"actual\": false, \"expected\": true, \"passed\": false}, {\"check\": \"gap\", \"actual\": false, \"expected\": false, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":28.921,"exit_code":1,"observations":[{"actual":false,"check":"contiguous","expected":true,"passed":false},{"actual":false,"check":"transposed","expected":false,"passed":true},{"actual":false,"check":"unit arbitrary","expected":true,"passed":false},{"actual":true,"check":"scalar","expected":true,"passed":true},{"actual":false,"check":"all singleton","expected":true,"passed":false},{"actual":false,"check":"gap","expected":false,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"contiguous\", \"actual\": false, \"expected\": true, \"passed\": false}, {\"check\": \"transposed\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"unit arbitrary\", \"actual\": false, \"expected\": true, \"passed\": false}, {\"check\": \"scalar\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"all singleton\", \"actual\": false, \"expected\": true, \"passed\": false}, {\"check\": \"gap\", \"actual\": false, \"expected\": false, \"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."}}