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Adjust epsilon value for improved numerical stability in format_value method #75

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AwaKhouna merged 1 commit into from
Aug 26, 2025
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Adjust epsilon value for improved numerical stability in format_value method #75

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7 changes: 4 additions & 3 deletions ocean/cp/_explanation.py
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Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,7 @@


class Explanation(Mapper[FeatureVar], BaseExplanation):
_epsilon: float = 1e-3
_epsilon: float = 1e-6
_x: Array1D = np.zeros((0,), dtype=int)

def vget(self, i: int) -> cp.IntVar:
Expand Down Expand Up @@ -73,6 +73,7 @@ def get(v: FeatureVar) -> Key | Number:
return self.reduce(get)

def format_value(self, f: int, idx: int, levels: list[float]) -> float:
eps = min(self._epsilon, 0.5 * min(np.diff(levels)))
if self.query.shape[0] == 0:
return float(levels[idx] + levels[idx + 1]) / 2
j = 0
Expand All @@ -82,9 +83,9 @@ def format_value(self, f: int, idx: int, levels: list[float]) -> float:
if j == idx:
value = float(query_arr[f])
elif j < idx:
value = float(levels[idx]) + self._epsilon
value = float(levels[idx]) + eps
else:
value = float(levels[idx + 1]) - self._epsilon
value = float(levels[idx + 1]) - eps
return value

@property
Expand Down