Function _sigmoid

uncommon_route/router/classifier.py:271–273

(distance: float, steepness: float)

# ─── Structural-only fallback (when model unavailable) ───

def _sigmoid(distance: float, steepness: float) -> float:
    clamped = max(-50.0, min(50.0, steepness * distance))
    return 1.0 / (1.0 + math.exp(-clamped))


def _rule_based_classify(