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Clipping fix to underflow. #288

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Clipping fix to underflow. #288

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5c53a18
Clipping fix to underflow.
Averydx Mar 30, 2026
02bf7d6
linting edits.
Averydx Mar 30, 2026
32714bd
mistake in commit.
Averydx Mar 30, 2026
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3 changes: 2 additions & 1 deletion epymorph/data/mm/centroids.py
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Original file line number Diff line number Diff line change
Expand Up @@ -55,7 +55,8 @@ def dispersal_kernel(self) -> NDArray[np.float64]:
centroid = self.data("centroid")
phi = self.data("phi")
distance = pairwise_haversine(centroid)
return row_normalize(1 / np.exp(distance / phi))
prob = np.exp(-np.clip(distance / phi, a_min=None, a_max=100.0))
return row_normalize(prob)

def evaluate(self, tick: Tick) -> NDArray[np.int64]:
pop = self.data("population")
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