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"""Math utils"""
def is_kronecker_delta(vector):
"""
Check if vector is a kronecker delta.
Args:
vector: iterable of numbers
Returns:
bool, True if vector is a kronecker delta vector, False otherwise.
In belief propagation, specific evidence (variable is directly observed)
is a kronecker delta vector, but virtual evidence is not.
"""
count = 0
for x in vector:
if x == 1:
count += 1
elif x != 0:
return False
if count == 1:
return True
else:
return False
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