{"abstract":"row reduction uses the global value array.","category":"Sparse tensor canonicalization","checks":6,"contract":"Return one sum per CSR row using that row’s pointer interval, including zero for empty rows.","contract_signature":"ptr,values","evaluation_group":"w3-sparse-tensor-canonicalization-csr-row-sum","failed_approach":"Empty rows are rows with sum zero in this integer contract.","family":"w3-sparse-tensor-canonicalization-csr-row-sum","id":"FA-100476","implementations":{"attempt":{"sha256":"985e330b81742eba385952cbce8de8b75b5e9b90fa063822e47b019cd4cb44cb","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(ptr,values):\n    return [sum(values[ptr[r]:ptr[r+1]]) if ptr[r+1]>ptr[r] else None for r in range(len(ptr)-1)]\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('empty middle',solve([0,2,2,3],[N,2,4]),[N+2,0,4])\ncheck('all empty',solve([0,0,0],[]),[0,0])\ncheck('one row',solve([0,2],[N,3]),[N+3])\ncheck('negative values',solve([0,2,3],[-N,1,5]),[1-N,5])\ncheck('trailing empty',solve([0,1,1,1],[7]),[7,0,0])\ncheck('no rows',solve([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":"dc1e0fa9e21fee951c5ee2ca7c90526465e8a8281030ed164aea4f5398c229c3","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(ptr,values):\n    return [sum(values)]*(len(ptr)-1)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('empty middle',solve([0,2,2,3],[N,2,4]),[N+2,0,4])\ncheck('all empty',solve([0,0,0],[]),[0,0])\ncheck('one row',solve([0,2],[N,3]),[N+3])\ncheck('negative values',solve([0,2,3],[-N,1,5]),[1-N,5])\ncheck('trailing empty',solve([0,1,1,1],[7]),[7,0,0])\ncheck('no rows',solve([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":"These are toy integer-valued COO or CSR contracts; they make no claim about a framework API, floating point policy, or large tensor performance. 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-sparse-tensor-canonicalization-csr-row-sum","generated_at":"2026-09-30T16:48:35.815655+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"A small offline sparse-array operation has explicit coordinate and storage semantics.","root_cause":"The reduction ignores row boundaries or represents empty rows as missing values.","sha256":"8346ee2f7d244b4a58f13c23a73c84bb2d5f944d5f31bd00c8a163a80086520d","title":"Sparse tensor: row reduction uses the global value array · 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":28.878,"exit_code":1,"observations":[{"actual":[3,null,4],"check":"empty middle","expected":[3,0,4],"passed":false},{"actual":[null,null],"check":"all empty","expected":[0,0],"passed":false},{"actual":[4],"check":"one row","expected":[4],"passed":true},{"actual":[0,5],"check":"negative values","expected":[0,5],"passed":true},{"actual":[7,null,null],"check":"trailing empty","expected":[7,0,0],"passed":false},{"actual":[],"check":"no rows","expected":[],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"empty middle\", \"actual\": [3, null, 4], \"expected\": [3, 0, 4], \"passed\": false}, {\"check\": \"all empty\", \"actual\": [null, null], \"expected\": [0, 0], \"passed\": false}, {\"check\": \"one row\", \"actual\": [4], \"expected\": [4], \"passed\": true}, {\"check\": \"negative values\", \"actual\": [0, 5], \"expected\": [0, 5], \"passed\": true}, {\"check\": \"trailing empty\", \"actual\": [7, null, null], \"expected\": [7, 0, 0], \"passed\": false}, {\"check\": \"no rows\", \"actual\": [], \"expected\": [], \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":27.669,"exit_code":1,"observations":[{"actual":[7,7,7],"check":"empty middle","expected":[3,0,4],"passed":false},{"actual":[0,0],"check":"all empty","expected":[0,0],"passed":true},{"actual":[4],"check":"one row","expected":[4],"passed":true},{"actual":[5,5],"check":"negative values","expected":[0,5],"passed":false},{"actual":[7,7,7],"check":"trailing empty","expected":[7,0,0],"passed":false},{"actual":[],"check":"no rows","expected":[],"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"empty middle\", \"actual\": [7, 7, 7], \"expected\": [3, 0, 4], \"passed\": false}, {\"check\": \"all empty\", \"actual\": [0, 0], \"expected\": [0, 0], \"passed\": true}, {\"check\": \"one row\", \"actual\": [4], \"expected\": [4], \"passed\": true}, {\"check\": \"negative values\", \"actual\": [5, 5], \"expected\": [0, 5], \"passed\": false}, {\"check\": \"trailing empty\", \"actual\": [7, 7, 7], \"expected\": [7, 0, 0], \"passed\": false}, {\"check\": \"no rows\", \"actual\": [], \"expected\": [], \"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."}}