jack
44 lines
1.3 KiB
Python
44 lines
1.3 KiB
Python
"""Classify sensor values into three bands around (target, margin)
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Auto mode derives target=mean, margin=1
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"""
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from __future__ import annotations
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import math
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from dataclasses import dataclass
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BAND_IN = "in_range"
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BAND_HIGH = "high"
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BAND_LOW = "low"
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@dataclass(frozen=True)
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class ThresholdConfig:
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set_point: float = 149.0 # process target: used as band TARGET when auto=False
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margin: float = 1.0 # used as band MARGIN when auto=False
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auto: bool = True # auto=True: target=frame mean, margin=frame 1σ
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def resolve_bounds(values: list[float], cfg: ThresholdConfig) -> tuple[float, float]:
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if not cfg.auto:
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return cfg.set_point, cfg.margin
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clean = [v for v in values if not math.isnan(v)]
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if not clean:
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return cfg.set_point, cfg.margin
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mean = sum(clean) / len(clean)
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variance = sum((v - mean) ** 2 for v in clean) / len(clean)
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return mean, math.sqrt(variance)
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def classify(value: float, target: float, margin: float) -> str:
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if math.isnan(value):
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return BAND_IN
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if value > target + margin:
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return BAND_HIGH
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if value < target - margin:
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return BAND_LOW
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return BAND_IN
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def classify_all(values: list[float], cfg: ThresholdConfig) -> list[str]:
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target, margin = resolve_bounds(values, cfg)
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return [classify(v, target, margin)for v in values ]
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