{"abstract":"Linear decay ignores the configured minimum rate.","category":"Learning rate schedules","checks":6,"contract":"Linearly decay from base to floor across total steps and clamp at both endpoints.","contract_signature":"step, base, floor, total","evaluation_group":"lr-schedule-linear-floor","failed_approach":"Applying the floor only before the endpoint still returns zero at the endpoint.","family":"w3-learning-rate-schedules-linear-floor","id":"FA-99116","implementations":{"attempt":{"sha256":"5d3a82374d5c7b1fea7e07a912ca57fcf8fcf412ae7aa81df2281d312afc2acd","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(step, base, floor, total):\n    return max(floor,base*(1-step/total)) if step<total else 0\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('start',solve(0,10,2,4),10); check('quarter',solve(1,10,2,4),7.5); check('mid',solve(2,10,2,4),5); check('floor',solve(4,10,2,4),2); check('after',solve(6,10,2,4),2); check('equal floor',solve(0,3,3,4),3)\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":"7d6ead06558665dc1087be7b98c2774e9cd266099759d41ee431ec2815fdf35a","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(step, base, floor, total):\n    return base*max(0,1-step/total)\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\ncheck('start',solve(0,10,2,4),10); check('quarter',solve(1,10,2,4),7.5); check('mid',solve(2,10,2,4),5); check('floor',solve(4,10,2,4),2); check('after',solve(6,10,2,4),2); check('equal floor',solve(0,3,3,4),3)\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 scalar contracts with integer steps and finite parameters; they do not model framework defaults or optimizer state. 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-learning-rate-schedules-linear-floor","generated_at":"2026-09-30T16:48:20.350830+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"A deterministic scalar schedule makes step-to-rate mapping explicit for a small training loop.","root_cause":"The decay formula is hard-coded to approach zero instead of the configured floor.","sha256":"67c45ee72902799bfc72dd565944965a33ee338350f260a5ff6615ad17d40daa","title":"Linear decay ignores the configured minimum rate · 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":27.424,"exit_code":1,"observations":[{"actual":10.0,"check":"start","expected":10,"passed":true},{"actual":7.5,"check":"quarter","expected":7.5,"passed":true},{"actual":5.0,"check":"mid","expected":5,"passed":true},{"actual":0,"check":"floor","expected":2,"passed":false},{"actual":0,"check":"after","expected":2,"passed":false},{"actual":3,"check":"equal floor","expected":3,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"start\", \"actual\": 10.0, \"expected\": 10, \"passed\": true}, {\"check\": \"quarter\", \"actual\": 7.5, \"expected\": 7.5, \"passed\": true}, {\"check\": \"mid\", \"actual\": 5.0, \"expected\": 5, \"passed\": true}, {\"check\": \"floor\", \"actual\": 0, \"expected\": 2, \"passed\": false}, {\"check\": \"after\", \"actual\": 0, \"expected\": 2, \"passed\": false}, {\"check\": \"equal floor\", \"actual\": 3, \"expected\": 3, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":26.262,"exit_code":1,"observations":[{"actual":10.0,"check":"start","expected":10,"passed":true},{"actual":7.5,"check":"quarter","expected":7.5,"passed":true},{"actual":5.0,"check":"mid","expected":5,"passed":true},{"actual":0,"check":"floor","expected":2,"passed":false},{"actual":0,"check":"after","expected":2,"passed":false},{"actual":3.0,"check":"equal floor","expected":3,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"start\", \"actual\": 10.0, \"expected\": 10, \"passed\": true}, {\"check\": \"quarter\", \"actual\": 7.5, \"expected\": 7.5, \"passed\": true}, {\"check\": \"mid\", \"actual\": 5.0, \"expected\": 5, \"passed\": true}, {\"check\": \"floor\", \"actual\": 0, \"expected\": 2, \"passed\": false}, {\"check\": \"after\", \"actual\": 0, \"expected\": 2, \"passed\": false}, {\"check\": \"equal floor\", \"actual\": 3.0, \"expected\": 3, \"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."}}