FA-67836 / Elevator dispatch scheduling / Open access
Encoder position and door zone detection: millimetre rounding · case 01
Positions just short of the zone edge are rounded into it.
ROOT CAUSE
The position is rounded to nearest millimetre instead of floored.
VERIFIED REPAIR
Floor the micrometre position to millimetres.
Unsuccessful approach: Ceiling division rounds every fractional millimetre up.
Case contract
Car position is tracked in micrometres: start_mm*1000, pulses add count*um_per_pulse, a door-zone magnet at floor k resets the position to floor_mm[k]*1000. After every event the position in mm is floor(um/1000); the car is at the nearest floor (ties to the lower index) if within zone_mm inclusive, otherwise None (between floors).
Why this case matters
Lift group controllers make these decisions many times per minute; a wrong answer strands passengers, wastes trips or overrides a safety rule.
1 / The failure
Exit 1"""Failure Map reference implementation. Python standard library only."""
import json
N = 1
observations = []
def solve(x):
table = x['floor_mm']
pos = x['start_mm'] * 1000
out = []
for kind, v in x['events']:
if kind == 'pulses':
pos += v * x['um_per_pulse']
else:
pos = table[v] * 1000
mm = round(pos / 1000)
best = min(range(len(table)), key=lambda k: (abs(table[k] - mm), k))
out.append(best if abs(table[best] - mm) <= x['zone_mm'] else None)
return out
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('regression: six-tenths of a millimetre short of the zone', {'floor_mm': [0, 3000], 'start_mm': 2924, 'um_per_pulse': 600, 'zone_mm': 75, 'events': [['pulses', 1], ['pulses', 1]]}, [None, 1]), ('boundary: encoder slip accumulates', {'floor_mm': [0, 3000, 6000], 'start_mm': 0, 'um_per_pulse': 997, 'zone_mm': 50, 'events': [['pulses', 3000], ['pulses', 3000]]}, [1, 2]), ('boundary: magnet correction', {'floor_mm': [0, 3000, 6000], 'start_mm': 0, 'um_per_pulse': 1003, 'zone_mm': 50, 'events': [['pulses', 3000], ['magnet', 1], ['pulses', 3000]]}, [1, 1, 2]), ('boundary: zone edge', {'floor_mm': [0, 3000], 'start_mm': 0, 'um_per_pulse': 1000, 'zone_mm': 75, 'events': [['pulses', 2925], ['pulses', 1]]}, [1, 1]), ('boundary: sub-millimetre pulses', {'floor_mm': [0, 3000], 'start_mm': 0, 'um_per_pulse': 997, 'zone_mm': 50, 'events': [['pulses', 999], ['pulses', 2]]}, [None, None]), ('control 1', {'floor_mm': [0, 4200, 8400, 11400, 14900], 'start_mm': 20, 'um_per_pulse': 1000, 'zone_mm': 50, 'events': [['magnet', 3], ['pulses', 5000], ['magnet', 4], ['pulses', 2999], ['pulses', 4200], ['pulses', 2999], ['magnet', 4]]}, [3, None, 4, None, None, None, 4]), ('control 4', {'floor_mm': [0, 3000, 6500, 10000, 13500, 16500, 20000], 'start_mm': 2990, 'um_per_pulse': 1000, 'zone_mm': 75, 'events': [['pulses', 1000], ['pulses', 100]]}, [None, None]), ('control 7', {'floor_mm': [0, 3500, 7700, 10700, 14200, 17200, 21400], 'start_mm': 2990, 'um_per_pulse': 997, 'zone_mm': 75, 'events': [['magnet', 0], ['pulses', 100], ['pulses', 1000], ['pulses', 100], ['magnet', 2], ['pulses', 3000]]}, [0, None, None, None, 2, 3])], [('regression: six-tenths of a millimetre short of the zone', {'floor_mm': [0, 3000], 'start_mm': 2924, 'um_per_pulse': 600, 'zone_mm': 75, 'events': [['pulses', 1], ['pulses', 1]]}, [None, 1]), ('boundary: zone edge', {'floor_mm': [0, 3000], 'start_mm': 0, 'um_per_pulse': 1000, 'zone_mm': 75, 'events': [['pulses', 2925], ['pulses', 1]]}, [1, 1]), ('boundary: sub-millimetre pulses', {'floor_mm': [0, 3000], 'start_mm': 0, 'um_per_pulse': 997, 'zone_mm': 50, 'events': [['pulses', 999], ['pulses', 2]]}, [None, None]), ('boundary: fractional millimetre below a floor', {'floor_mm': [0, 3000], 'start_mm': 2924, 'um_per_pulse': 1003, 'zone_mm': 75, 'events': [['pulses', 1]]}, [1]), ('boundary: encoder slip accumulates', {'floor_mm': [0, 3000, 6000], 'start_mm': 0, 'um_per_pulse': 997, 'zone_mm': 50, 'events': [['pulses', 3000], ['pulses', 3000]]}, [1, 2]), ('control 12', {'floor_mm': [0, 3000, 6000, 10200, 13200, 17400], 'start_mm': 2990, 'um_per_pulse': 997, 'zone_mm': 75, 'events': [['magnet', 0], ['pulses', 3499], ['pulses', 1000], ['pulses', 3500], ['pulses', 100], ['magnet', 2], ['pulses', 3500]]}, [0, None, None, None, None, 2, None]), ('control 15', {'floor_mm': [0, 3000, 7200, 11400, 15600, 19100], 'start_mm': 0, 'um_per_pulse': 1000, 'zone_mm': 50, 'events': [['pulses', 2999], ['pulses', 3499]]}, [1, None]), ('control 18', {'floor_mm': [0, 3000, 7200, 11400, 15600, 19100], 'start_mm': 0, 'um_per_pulse': 1003, 'zone_mm': 75, 'events': [['pulses', 3499], ['pulses', 3000], ['pulses', 3000]]}, [None, None, None])], [('regression: six-tenths of a millimetre short of the zone', {'floor_mm': [0, 3000], 'start_mm': 2924, 'um_per_pulse': 600, 'zone_mm': 75, 'events': [['pulses', 1], ['pulses', 1]]}, [None, 1]), ('boundary: fractional millimetre below a floor', {'floor_mm': [0, 3000], 'start_mm': 2924, 'um_per_pulse': 1003, 'zone_mm': 75, 'events': [['pulses', 1]]}, [1]), ('boundary: encoder slip accumulates', {'floor_mm': [0, 3000, 6000], 'start_mm': 0, 'um_per_pulse': 997, 'zone_mm': 50, 'events': [['pulses', 3000], ['pulses', 3000]]}, [1, 2]), ('boundary: magnet correction', {'floor_mm': [0, 3000, 6000], 'start_mm': 0, 'um_per_pulse': 1003, 'zone_mm': 50, 'events': [['pulses', 3000], ['magnet', 1], ['pulses', 3000]]}, [1, 1, 2]), ('boundary: zone edge', {'floor_mm': [0, 3000], 'start_mm': 0, 'um_per_pulse': 1000, 'zone_mm': 75, 'events': [['pulses', 2925], ['pulses', 1]]}, [1, 1]), ('control 23', {'floor_mm': [0, 4200, 7700, 11200, 15400, 18400, 22600, 25600, 28600], 'start_mm': 0, 'um_per_pulse': 1003, 'zone_mm': 50, 'events': [['pulses', 3500], ['pulses', 3000]]}, [None, None]), ('control 26', {'floor_mm': [0, 4200, 7200, 11400, 14900, 17900, 21400, 25600], 'start_mm': 0, 'um_per_pulse': 997, 'zone_mm': 75, 'events': [['pulses', 4200], ['pulses', 4200], ['pulses', 3500], ['pulses', 2999], ['pulses', 3499], ['pulses', 2999], ['pulses', 4200]]}, [1, None, None, 4, None, 6, None]), ('control 29', {'floor_mm': [0, 4200, 8400, 12600, 16100, 20300, 23800, 27300], 'start_mm': 20, 'um_per_pulse': 600, 'zone_mm': 50, 'events': [['magnet', 3], ['pulses', 2999], ['pulses', 3499], ['pulses', 5000], ['magnet', 1], ['pulses', 100]]}, [3, None, None, None, 1, None])], [('regression: six-tenths of a millimetre short of the zone', {'floor_mm': [0, 3000], 'start_mm': 2924, 'um_per_pulse': 600, 'zone_mm': 75, 'events': [['pulses', 1], ['pulses', 1]]}, [None, 1]), ('boundary: encoder slip accumulates', {'floor_mm': [0, 3000, 6000], 'start_mm': 0, 'um_per_pulse': 997, 'zone_mm': 50, 'events': [['pulses', 3000], ['pulses', 3000]]}, [1, 2]), ('boundary: magnet correction', {'floor_mm': [0, 3000, 6000], 'start_mm': 0, 'um_per_pulse': 1003, 'zone_mm': 50, 'events': [['pulses', 3000], ['magnet', 1], ['pulses', 3000]]}, [1, 1, 2]), ('boundary: zone edge', {'floor_mm': [0, 3000], 'start_mm': 0, 'um_per_pulse': 1000, 'zone_mm': 75, 'events': [['pulses', 2925], ['pulses', 1]]}, [1, 1]), ('boundary: sub-millimetre pulses', {'floor_mm': [0, 3000], 'start_mm': 0, 'um_per_pulse': 997, 'zone_mm': 50, 'events': [['pulses', 999], ['pulses', 2]]}, [None, None]), ('control 34', {'floor_mm': [0, 4200, 7700, 10700, 14200, 17700, 20700, 23700], 'start_mm': 2990, 'um_per_pulse': 600, 'zone_mm': 50, 'events': [['magnet', 5], ['pulses', 5000]]}, [5, 6]), ('control 37', {'floor_mm': [0, 4200, 7200, 10700, 14200, 17700, 20700], 'start_mm': 20, 'um_per_pulse': 1000, 'zone_mm': 50, 'events': [['pulses', 2999], ['pulses', 1000], ['pulses', 100], ['magnet', 2]]}, [None, None, None, 2]), ('control 40', {'floor_mm': [0, 4200, 7700, 11900, 15400, 19600, 22600, 26800, 29800], 'start_mm': 20, 'um_per_pulse': 1000, 'zone_mm': 50, 'events': [['pulses', 3000], ['magnet', 0], ['magnet', 8], ['pulses', 5000], ['pulses', 3000], ['pulses', 5000], ['magnet', 4]]}, [None, 0, 8, None, None, None, 4])], [('regression: six-tenths of a millimetre short of the zone', {'floor_mm': [0, 3000], 'start_mm': 2924, 'um_per_pulse': 600, 'zone_mm': 75, 'events': [['pulses', 1], ['pulses', 1]]}, [None, 1]), ('boundary: zone edge', {'floor_mm': [0, 3000], 'start_mm': 0, 'um_per_pulse': 1000, 'zone_mm': 75, 'events': [['pulses', 2925], ['pulses', 1]]}, [1, 1]), ('boundary: sub-millimetre pulses', {'floor_mm': [0, 3000], 'start_mm': 0, 'um_per_pulse': 997, 'zone_mm': 50, 'events': [['pulses', 999], ['pulses', 2]]}, [None, None]), ('boundary: fractional millimetre below a floor', {'floor_mm': [0, 3000], 'start_mm': 2924, 'um_per_pulse': 1003, 'zone_mm': 75, 'events': [['pulses', 1]]}, [1]), ('boundary: encoder slip accumulates', {'floor_mm': [0, 3000, 6000], 'start_mm': 0, 'um_per_pulse': 997, 'zone_mm': 50, 'events': [['pulses', 3000], ['pulses', 3000]]}, [1, 2]), ('control 45', {'floor_mm': [0, 3000, 7200, 11400, 15600, 19800, 22800, 26300], 'start_mm': 2990, 'um_per_pulse': 600, 'zone_mm': 75, 'events': [['magnet', 3], ['pulses', 3500], ['pulses', 3500]]}, [3, None, 4]), ('control 48', {'floor_mm': [0, 3000, 6000, 9000, 13200, 16200, 20400, 23400, 26400], 'start_mm': 0, 'um_per_pulse': 1003, 'zone_mm': 50, 'events': [['magnet', 0], ['pulses', 1000], ['magnet', 2]]}, [0, None, 2]), ('control 51', {'floor_mm': [0, 4200, 7200, 10700, 14900, 19100], 'start_mm': 2990, 'um_per_pulse': 1003, 'zone_mm': 50, 'events': [['magnet', 0], ['pulses', 100], ['pulses', 100]]}, [0, None, None])]]
for label, args, expected in fixtures[N-1]:
check(label, solve(args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| regression: six-tenths of a millimetre short of the zone | [1, 1] | [None, 1] | Failed |
| boundary: encoder slip accumulates | [1, 2] | [1, 2] | Passed |
| boundary: magnet correction | [1, 1, 2] | [1, 1, 2] | Passed |
| boundary: zone edge | [1, 1] | [1, 1] | Passed |
| boundary: sub-millimetre pulses | [None, None] | [None, None] | Passed |
| control 1 | [3, None, 4, None, None, None, 4] | [3, None, 4, None, None, None, 4] | Passed |
| control 4 | [None, None] | [None, None] | Passed |
| control 7 | [0, None, None, None, 2, 3] | [0, None, None, None, 2, 3] | Passed |
SHA-256 / c8db4b285b421410351b84e9b89523bc733764e0a8376ba75cd8f3bcb20c2e2e
2 / The unsuccessful fix
Exit 1"""Failure Map reference implementation. Python standard library only."""
import json
N = 1
observations = []
def solve(x):
table = x['floor_mm']
pos = x['start_mm'] * 1000
out = []
for kind, v in x['events']:
if kind == 'pulses':
pos += v * x['um_per_pulse']
else:
pos = table[v] * 1000
mm = -(-pos // 1000)
best = min(range(len(table)), key=lambda k: (abs(table[k] - mm), k))
out.append(best if abs(table[best] - mm) <= x['zone_mm'] else None)
return out
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('regression: six-tenths of a millimetre short of the zone', {'floor_mm': [0, 3000], 'start_mm': 2924, 'um_per_pulse': 600, 'zone_mm': 75, 'events': [['pulses', 1], ['pulses', 1]]}, [None, 1]), ('boundary: encoder slip accumulates', {'floor_mm': [0, 3000, 6000], 'start_mm': 0, 'um_per_pulse': 997, 'zone_mm': 50, 'events': [['pulses', 3000], ['pulses', 3000]]}, [1, 2]), ('boundary: magnet correction', {'floor_mm': [0, 3000, 6000], 'start_mm': 0, 'um_per_pulse': 1003, 'zone_mm': 50, 'events': [['pulses', 3000], ['magnet', 1], ['pulses', 3000]]}, [1, 1, 2]), ('boundary: zone edge', {'floor_mm': [0, 3000], 'start_mm': 0, 'um_per_pulse': 1000, 'zone_mm': 75, 'events': [['pulses', 2925], ['pulses', 1]]}, [1, 1]), ('boundary: sub-millimetre pulses', {'floor_mm': [0, 3000], 'start_mm': 0, 'um_per_pulse': 997, 'zone_mm': 50, 'events': [['pulses', 999], ['pulses', 2]]}, [None, None]), ('control 1', {'floor_mm': [0, 4200, 8400, 11400, 14900], 'start_mm': 20, 'um_per_pulse': 1000, 'zone_mm': 50, 'events': [['magnet', 3], ['pulses', 5000], ['magnet', 4], ['pulses', 2999], ['pulses', 4200], ['pulses', 2999], ['magnet', 4]]}, [3, None, 4, None, None, None, 4]), ('control 4', {'floor_mm': [0, 3000, 6500, 10000, 13500, 16500, 20000], 'start_mm': 2990, 'um_per_pulse': 1000, 'zone_mm': 75, 'events': [['pulses', 1000], ['pulses', 100]]}, [None, None]), ('control 7', {'floor_mm': [0, 3500, 7700, 10700, 14200, 17200, 21400], 'start_mm': 2990, 'um_per_pulse': 997, 'zone_mm': 75, 'events': [['magnet', 0], ['pulses', 100], ['pulses', 1000], ['pulses', 100], ['magnet', 2], ['pulses', 3000]]}, [0, None, None, None, 2, 3])], [('regression: six-tenths of a millimetre short of the zone', {'floor_mm': [0, 3000], 'start_mm': 2924, 'um_per_pulse': 600, 'zone_mm': 75, 'events': [['pulses', 1], ['pulses', 1]]}, [None, 1]), ('boundary: zone edge', {'floor_mm': [0, 3000], 'start_mm': 0, 'um_per_pulse': 1000, 'zone_mm': 75, 'events': [['pulses', 2925], ['pulses', 1]]}, [1, 1]), ('boundary: sub-millimetre pulses', {'floor_mm': [0, 3000], 'start_mm': 0, 'um_per_pulse': 997, 'zone_mm': 50, 'events': [['pulses', 999], ['pulses', 2]]}, [None, None]), ('boundary: fractional millimetre below a floor', {'floor_mm': [0, 3000], 'start_mm': 2924, 'um_per_pulse': 1003, 'zone_mm': 75, 'events': [['pulses', 1]]}, [1]), ('boundary: encoder slip accumulates', {'floor_mm': [0, 3000, 6000], 'start_mm': 0, 'um_per_pulse': 997, 'zone_mm': 50, 'events': [['pulses', 3000], ['pulses', 3000]]}, [1, 2]), ('control 12', {'floor_mm': [0, 3000, 6000, 10200, 13200, 17400], 'start_mm': 2990, 'um_per_pulse': 997, 'zone_mm': 75, 'events': [['magnet', 0], ['pulses', 3499], ['pulses', 1000], ['pulses', 3500], ['pulses', 100], ['magnet', 2], ['pulses', 3500]]}, [0, None, None, None, None, 2, None]), ('control 15', {'floor_mm': [0, 3000, 7200, 11400, 15600, 19100], 'start_mm': 0, 'um_per_pulse': 1000, 'zone_mm': 50, 'events': [['pulses', 2999], ['pulses', 3499]]}, [1, None]), ('control 18', {'floor_mm': [0, 3000, 7200, 11400, 15600, 19100], 'start_mm': 0, 'um_per_pulse': 1003, 'zone_mm': 75, 'events': [['pulses', 3499], ['pulses', 3000], ['pulses', 3000]]}, [None, None, None])], [('regression: six-tenths of a millimetre short of the zone', {'floor_mm': [0, 3000], 'start_mm': 2924, 'um_per_pulse': 600, 'zone_mm': 75, 'events': [['pulses', 1], ['pulses', 1]]}, [None, 1]), ('boundary: fractional millimetre below a floor', {'floor_mm': [0, 3000], 'start_mm': 2924, 'um_per_pulse': 1003, 'zone_mm': 75, 'events': [['pulses', 1]]}, [1]), ('boundary: encoder slip accumulates', {'floor_mm': [0, 3000, 6000], 'start_mm': 0, 'um_per_pulse': 997, 'zone_mm': 50, 'events': [['pulses', 3000], ['pulses', 3000]]}, [1, 2]), ('boundary: magnet correction', {'floor_mm': [0, 3000, 6000], 'start_mm': 0, 'um_per_pulse': 1003, 'zone_mm': 50, 'events': [['pulses', 3000], ['magnet', 1], ['pulses', 3000]]}, [1, 1, 2]), ('boundary: zone edge', {'floor_mm': [0, 3000], 'start_mm': 0, 'um_per_pulse': 1000, 'zone_mm': 75, 'events': [['pulses', 2925], ['pulses', 1]]}, [1, 1]), ('control 23', {'floor_mm': [0, 4200, 7700, 11200, 15400, 18400, 22600, 25600, 28600], 'start_mm': 0, 'um_per_pulse': 1003, 'zone_mm': 50, 'events': [['pulses', 3500], ['pulses', 3000]]}, [None, None]), ('control 26', {'floor_mm': [0, 4200, 7200, 11400, 14900, 17900, 21400, 25600], 'start_mm': 0, 'um_per_pulse': 997, 'zone_mm': 75, 'events': [['pulses', 4200], ['pulses', 4200], ['pulses', 3500], ['pulses', 2999], ['pulses', 3499], ['pulses', 2999], ['pulses', 4200]]}, [1, None, None, 4, None, 6, None]), ('control 29', {'floor_mm': [0, 4200, 8400, 12600, 16100, 20300, 23800, 27300], 'start_mm': 20, 'um_per_pulse': 600, 'zone_mm': 50, 'events': [['magnet', 3], ['pulses', 2999], ['pulses', 3499], ['pulses', 5000], ['magnet', 1], ['pulses', 100]]}, [3, None, None, None, 1, None])], [('regression: six-tenths of a millimetre short of the zone', {'floor_mm': [0, 3000], 'start_mm': 2924, 'um_per_pulse': 600, 'zone_mm': 75, 'events': [['pulses', 1], ['pulses', 1]]}, [None, 1]), ('boundary: encoder slip accumulates', {'floor_mm': [0, 3000, 6000], 'start_mm': 0, 'um_per_pulse': 997, 'zone_mm': 50, 'events': [['pulses', 3000], ['pulses', 3000]]}, [1, 2]), ('boundary: magnet correction', {'floor_mm': [0, 3000, 6000], 'start_mm': 0, 'um_per_pulse': 1003, 'zone_mm': 50, 'events': [['pulses', 3000], ['magnet', 1], ['pulses', 3000]]}, [1, 1, 2]), ('boundary: zone edge', {'floor_mm': [0, 3000], 'start_mm': 0, 'um_per_pulse': 1000, 'zone_mm': 75, 'events': [['pulses', 2925], ['pulses', 1]]}, [1, 1]), ('boundary: sub-millimetre pulses', {'floor_mm': [0, 3000], 'start_mm': 0, 'um_per_pulse': 997, 'zone_mm': 50, 'events': [['pulses', 999], ['pulses', 2]]}, [None, None]), ('control 34', {'floor_mm': [0, 4200, 7700, 10700, 14200, 17700, 20700, 23700], 'start_mm': 2990, 'um_per_pulse': 600, 'zone_mm': 50, 'events': [['magnet', 5], ['pulses', 5000]]}, [5, 6]), ('control 37', {'floor_mm': [0, 4200, 7200, 10700, 14200, 17700, 20700], 'start_mm': 20, 'um_per_pulse': 1000, 'zone_mm': 50, 'events': [['pulses', 2999], ['pulses', 1000], ['pulses', 100], ['magnet', 2]]}, [None, None, None, 2]), ('control 40', {'floor_mm': [0, 4200, 7700, 11900, 15400, 19600, 22600, 26800, 29800], 'start_mm': 20, 'um_per_pulse': 1000, 'zone_mm': 50, 'events': [['pulses', 3000], ['magnet', 0], ['magnet', 8], ['pulses', 5000], ['pulses', 3000], ['pulses', 5000], ['magnet', 4]]}, [None, 0, 8, None, None, None, 4])], [('regression: six-tenths of a millimetre short of the zone', {'floor_mm': [0, 3000], 'start_mm': 2924, 'um_per_pulse': 600, 'zone_mm': 75, 'events': [['pulses', 1], ['pulses', 1]]}, [None, 1]), ('boundary: zone edge', {'floor_mm': [0, 3000], 'start_mm': 0, 'um_per_pulse': 1000, 'zone_mm': 75, 'events': [['pulses', 2925], ['pulses', 1]]}, [1, 1]), ('boundary: sub-millimetre pulses', {'floor_mm': [0, 3000], 'start_mm': 0, 'um_per_pulse': 997, 'zone_mm': 50, 'events': [['pulses', 999], ['pulses', 2]]}, [None, None]), ('boundary: fractional millimetre below a floor', {'floor_mm': [0, 3000], 'start_mm': 2924, 'um_per_pulse': 1003, 'zone_mm': 75, 'events': [['pulses', 1]]}, [1]), ('boundary: encoder slip accumulates', {'floor_mm': [0, 3000, 6000], 'start_mm': 0, 'um_per_pulse': 997, 'zone_mm': 50, 'events': [['pulses', 3000], ['pulses', 3000]]}, [1, 2]), ('control 45', {'floor_mm': [0, 3000, 7200, 11400, 15600, 19800, 22800, 26300], 'start_mm': 2990, 'um_per_pulse': 600, 'zone_mm': 75, 'events': [['magnet', 3], ['pulses', 3500], ['pulses', 3500]]}, [3, None, 4]), ('control 48', {'floor_mm': [0, 3000, 6000, 9000, 13200, 16200, 20400, 23400, 26400], 'start_mm': 0, 'um_per_pulse': 1003, 'zone_mm': 50, 'events': [['magnet', 0], ['pulses', 1000], ['magnet', 2]]}, [0, None, 2]), ('control 51', {'floor_mm': [0, 4200, 7200, 10700, 14900, 19100], 'start_mm': 2990, 'um_per_pulse': 1003, 'zone_mm': 50, 'events': [['magnet', 0], ['pulses', 100], ['pulses', 100]]}, [0, None, None])]]
for label, args, expected in fixtures[N-1]:
check(label, solve(args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| regression: six-tenths of a millimetre short of the zone | [1, 1] | [None, 1] | Failed |
| boundary: encoder slip accumulates | [1, 2] | [1, 2] | Passed |
| boundary: magnet correction | [1, 1, 2] | [1, 1, 2] | Passed |
| boundary: zone edge | [1, 1] | [1, 1] | Passed |
| boundary: sub-millimetre pulses | [None, None] | [None, None] | Passed |
| control 1 | [3, None, 4, None, None, None, 4] | [3, None, 4, None, None, None, 4] | Passed |
| control 4 | [None, None] | [None, None] | Passed |
| control 7 | [0, None, None, None, 2, 3] | [0, None, None, None, 2, 3] | Passed |
SHA-256 / 810f56f271e266d60cd84c249216ae74da55deb0cd625c7bb55a5b544ce93073
3 / The verified repair
Exit 0"""Failure Map reference implementation. Python standard library only."""
import json
N = 1
observations = []
def solve(x):
table = x['floor_mm']
pos = x['start_mm'] * 1000
out = []
for kind, v in x['events']:
if kind == 'pulses':
pos += v * x['um_per_pulse']
else:
pos = table[v] * 1000
mm = pos // 1000
best = min(range(len(table)), key=lambda k: (abs(table[k] - mm), k))
out.append(best if abs(table[best] - mm) <= x['zone_mm'] else None)
return out
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('regression: six-tenths of a millimetre short of the zone', {'floor_mm': [0, 3000], 'start_mm': 2924, 'um_per_pulse': 600, 'zone_mm': 75, 'events': [['pulses', 1], ['pulses', 1]]}, [None, 1]), ('boundary: encoder slip accumulates', {'floor_mm': [0, 3000, 6000], 'start_mm': 0, 'um_per_pulse': 997, 'zone_mm': 50, 'events': [['pulses', 3000], ['pulses', 3000]]}, [1, 2]), ('boundary: magnet correction', {'floor_mm': [0, 3000, 6000], 'start_mm': 0, 'um_per_pulse': 1003, 'zone_mm': 50, 'events': [['pulses', 3000], ['magnet', 1], ['pulses', 3000]]}, [1, 1, 2]), ('boundary: zone edge', {'floor_mm': [0, 3000], 'start_mm': 0, 'um_per_pulse': 1000, 'zone_mm': 75, 'events': [['pulses', 2925], ['pulses', 1]]}, [1, 1]), ('boundary: sub-millimetre pulses', {'floor_mm': [0, 3000], 'start_mm': 0, 'um_per_pulse': 997, 'zone_mm': 50, 'events': [['pulses', 999], ['pulses', 2]]}, [None, None]), ('control 1', {'floor_mm': [0, 4200, 8400, 11400, 14900], 'start_mm': 20, 'um_per_pulse': 1000, 'zone_mm': 50, 'events': [['magnet', 3], ['pulses', 5000], ['magnet', 4], ['pulses', 2999], ['pulses', 4200], ['pulses', 2999], ['magnet', 4]]}, [3, None, 4, None, None, None, 4]), ('control 4', {'floor_mm': [0, 3000, 6500, 10000, 13500, 16500, 20000], 'start_mm': 2990, 'um_per_pulse': 1000, 'zone_mm': 75, 'events': [['pulses', 1000], ['pulses', 100]]}, [None, None]), ('control 7', {'floor_mm': [0, 3500, 7700, 10700, 14200, 17200, 21400], 'start_mm': 2990, 'um_per_pulse': 997, 'zone_mm': 75, 'events': [['magnet', 0], ['pulses', 100], ['pulses', 1000], ['pulses', 100], ['magnet', 2], ['pulses', 3000]]}, [0, None, None, None, 2, 3])], [('regression: six-tenths of a millimetre short of the zone', {'floor_mm': [0, 3000], 'start_mm': 2924, 'um_per_pulse': 600, 'zone_mm': 75, 'events': [['pulses', 1], ['pulses', 1]]}, [None, 1]), ('boundary: zone edge', {'floor_mm': [0, 3000], 'start_mm': 0, 'um_per_pulse': 1000, 'zone_mm': 75, 'events': [['pulses', 2925], ['pulses', 1]]}, [1, 1]), ('boundary: sub-millimetre pulses', {'floor_mm': [0, 3000], 'start_mm': 0, 'um_per_pulse': 997, 'zone_mm': 50, 'events': [['pulses', 999], ['pulses', 2]]}, [None, None]), ('boundary: fractional millimetre below a floor', {'floor_mm': [0, 3000], 'start_mm': 2924, 'um_per_pulse': 1003, 'zone_mm': 75, 'events': [['pulses', 1]]}, [1]), ('boundary: encoder slip accumulates', {'floor_mm': [0, 3000, 6000], 'start_mm': 0, 'um_per_pulse': 997, 'zone_mm': 50, 'events': [['pulses', 3000], ['pulses', 3000]]}, [1, 2]), ('control 12', {'floor_mm': [0, 3000, 6000, 10200, 13200, 17400], 'start_mm': 2990, 'um_per_pulse': 997, 'zone_mm': 75, 'events': [['magnet', 0], ['pulses', 3499], ['pulses', 1000], ['pulses', 3500], ['pulses', 100], ['magnet', 2], ['pulses', 3500]]}, [0, None, None, None, None, 2, None]), ('control 15', {'floor_mm': [0, 3000, 7200, 11400, 15600, 19100], 'start_mm': 0, 'um_per_pulse': 1000, 'zone_mm': 50, 'events': [['pulses', 2999], ['pulses', 3499]]}, [1, None]), ('control 18', {'floor_mm': [0, 3000, 7200, 11400, 15600, 19100], 'start_mm': 0, 'um_per_pulse': 1003, 'zone_mm': 75, 'events': [['pulses', 3499], ['pulses', 3000], ['pulses', 3000]]}, [None, None, None])], [('regression: six-tenths of a millimetre short of the zone', {'floor_mm': [0, 3000], 'start_mm': 2924, 'um_per_pulse': 600, 'zone_mm': 75, 'events': [['pulses', 1], ['pulses', 1]]}, [None, 1]), ('boundary: fractional millimetre below a floor', {'floor_mm': [0, 3000], 'start_mm': 2924, 'um_per_pulse': 1003, 'zone_mm': 75, 'events': [['pulses', 1]]}, [1]), ('boundary: encoder slip accumulates', {'floor_mm': [0, 3000, 6000], 'start_mm': 0, 'um_per_pulse': 997, 'zone_mm': 50, 'events': [['pulses', 3000], ['pulses', 3000]]}, [1, 2]), ('boundary: magnet correction', {'floor_mm': [0, 3000, 6000], 'start_mm': 0, 'um_per_pulse': 1003, 'zone_mm': 50, 'events': [['pulses', 3000], ['magnet', 1], ['pulses', 3000]]}, [1, 1, 2]), ('boundary: zone edge', {'floor_mm': [0, 3000], 'start_mm': 0, 'um_per_pulse': 1000, 'zone_mm': 75, 'events': [['pulses', 2925], ['pulses', 1]]}, [1, 1]), ('control 23', {'floor_mm': [0, 4200, 7700, 11200, 15400, 18400, 22600, 25600, 28600], 'start_mm': 0, 'um_per_pulse': 1003, 'zone_mm': 50, 'events': [['pulses', 3500], ['pulses', 3000]]}, [None, None]), ('control 26', {'floor_mm': [0, 4200, 7200, 11400, 14900, 17900, 21400, 25600], 'start_mm': 0, 'um_per_pulse': 997, 'zone_mm': 75, 'events': [['pulses', 4200], ['pulses', 4200], ['pulses', 3500], ['pulses', 2999], ['pulses', 3499], ['pulses', 2999], ['pulses', 4200]]}, [1, None, None, 4, None, 6, None]), ('control 29', {'floor_mm': [0, 4200, 8400, 12600, 16100, 20300, 23800, 27300], 'start_mm': 20, 'um_per_pulse': 600, 'zone_mm': 50, 'events': [['magnet', 3], ['pulses', 2999], ['pulses', 3499], ['pulses', 5000], ['magnet', 1], ['pulses', 100]]}, [3, None, None, None, 1, None])], [('regression: six-tenths of a millimetre short of the zone', {'floor_mm': [0, 3000], 'start_mm': 2924, 'um_per_pulse': 600, 'zone_mm': 75, 'events': [['pulses', 1], ['pulses', 1]]}, [None, 1]), ('boundary: encoder slip accumulates', {'floor_mm': [0, 3000, 6000], 'start_mm': 0, 'um_per_pulse': 997, 'zone_mm': 50, 'events': [['pulses', 3000], ['pulses', 3000]]}, [1, 2]), ('boundary: magnet correction', {'floor_mm': [0, 3000, 6000], 'start_mm': 0, 'um_per_pulse': 1003, 'zone_mm': 50, 'events': [['pulses', 3000], ['magnet', 1], ['pulses', 3000]]}, [1, 1, 2]), ('boundary: zone edge', {'floor_mm': [0, 3000], 'start_mm': 0, 'um_per_pulse': 1000, 'zone_mm': 75, 'events': [['pulses', 2925], ['pulses', 1]]}, [1, 1]), ('boundary: sub-millimetre pulses', {'floor_mm': [0, 3000], 'start_mm': 0, 'um_per_pulse': 997, 'zone_mm': 50, 'events': [['pulses', 999], ['pulses', 2]]}, [None, None]), ('control 34', {'floor_mm': [0, 4200, 7700, 10700, 14200, 17700, 20700, 23700], 'start_mm': 2990, 'um_per_pulse': 600, 'zone_mm': 50, 'events': [['magnet', 5], ['pulses', 5000]]}, [5, 6]), ('control 37', {'floor_mm': [0, 4200, 7200, 10700, 14200, 17700, 20700], 'start_mm': 20, 'um_per_pulse': 1000, 'zone_mm': 50, 'events': [['pulses', 2999], ['pulses', 1000], ['pulses', 100], ['magnet', 2]]}, [None, None, None, 2]), ('control 40', {'floor_mm': [0, 4200, 7700, 11900, 15400, 19600, 22600, 26800, 29800], 'start_mm': 20, 'um_per_pulse': 1000, 'zone_mm': 50, 'events': [['pulses', 3000], ['magnet', 0], ['magnet', 8], ['pulses', 5000], ['pulses', 3000], ['pulses', 5000], ['magnet', 4]]}, [None, 0, 8, None, None, None, 4])], [('regression: six-tenths of a millimetre short of the zone', {'floor_mm': [0, 3000], 'start_mm': 2924, 'um_per_pulse': 600, 'zone_mm': 75, 'events': [['pulses', 1], ['pulses', 1]]}, [None, 1]), ('boundary: zone edge', {'floor_mm': [0, 3000], 'start_mm': 0, 'um_per_pulse': 1000, 'zone_mm': 75, 'events': [['pulses', 2925], ['pulses', 1]]}, [1, 1]), ('boundary: sub-millimetre pulses', {'floor_mm': [0, 3000], 'start_mm': 0, 'um_per_pulse': 997, 'zone_mm': 50, 'events': [['pulses', 999], ['pulses', 2]]}, [None, None]), ('boundary: fractional millimetre below a floor', {'floor_mm': [0, 3000], 'start_mm': 2924, 'um_per_pulse': 1003, 'zone_mm': 75, 'events': [['pulses', 1]]}, [1]), ('boundary: encoder slip accumulates', {'floor_mm': [0, 3000, 6000], 'start_mm': 0, 'um_per_pulse': 997, 'zone_mm': 50, 'events': [['pulses', 3000], ['pulses', 3000]]}, [1, 2]), ('control 45', {'floor_mm': [0, 3000, 7200, 11400, 15600, 19800, 22800, 26300], 'start_mm': 2990, 'um_per_pulse': 600, 'zone_mm': 75, 'events': [['magnet', 3], ['pulses', 3500], ['pulses', 3500]]}, [3, None, 4]), ('control 48', {'floor_mm': [0, 3000, 6000, 9000, 13200, 16200, 20400, 23400, 26400], 'start_mm': 0, 'um_per_pulse': 1003, 'zone_mm': 50, 'events': [['magnet', 0], ['pulses', 1000], ['magnet', 2]]}, [0, None, 2]), ('control 51', {'floor_mm': [0, 4200, 7200, 10700, 14900, 19100], 'start_mm': 2990, 'um_per_pulse': 1003, 'zone_mm': 50, 'events': [['magnet', 0], ['pulses', 100], ['pulses', 100]]}, [0, None, None])]]
for label, args, expected in fixtures[N-1]:
check(label, solve(args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| regression: six-tenths of a millimetre short of the zone | [None, 1] | [None, 1] | Passed |
| boundary: encoder slip accumulates | [1, 2] | [1, 2] | Passed |
| boundary: magnet correction | [1, 1, 2] | [1, 1, 2] | Passed |
| boundary: zone edge | [1, 1] | [1, 1] | Passed |
| boundary: sub-millimetre pulses | [None, None] | [None, None] | Passed |
| control 1 | [3, None, 4, None, None, None, 4] | [3, None, 4, None, None, None, 4] | Passed |
| control 4 | [None, None] | [None, None] | Passed |
| control 7 | [0, None, None, None, 2, 3] | [0, None, None, None, 2, 3] | Passed |
SHA-256 / 5421ff20b814b368f4096f6498171a8142117df653899762c712dffbb3cf1961
Verification & scope
Stipulated toy lift-control contract for a bounded teaching model; it makes no claim of conformance to any lift code or vendor dispatcher and omits real safety cases. 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.
Observations recorded using Python 3.12.14 at 2026-09-29T14:47:56.567680+00:00.
Case digest / ada39206209a16471d215e8f22c660157a48ec10b24b3bc8660cb4f3f07ba652