TypeError: Real.grad illegally returned an integer-valued variable - when pm.sample

Дата публикации: 12-07-2026 18:07:42

Problem solved - thanks to a related question + answer by @jessegrabowski .
The issue turned out to be the distance matrix calculation.
The function def calc_distance_to calculates the euclidean distance between a focal mic in a mic array and all other mics - leading to 0 distance for the focal mic to itself. pt.math.linalg.norm goes haywire while seeing this 0 term - and throws the error. Adding a tiny offset to the distances does not help for some reason.
Things of course worked when I replaced the focal mic indexing with a shape conform pm.Normal because the random distribution almost never produces exactly 0 values.
The solution now is somehow to add a tiny offset (e.g. 1e-9) to the distances, and using pm.math functions rather than the pt.linalg.norm. This is the version of the distance calculation that works.
def calc_distance_to(focalmic, mic_array):
'''
'''
diff = mic_array - focalmic
diff += 1e-9
norm_dist = pm.math.sqrt(pm.math.sum(diff**2, axis=1))
return norm_dist

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