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German Larrain committed 795739a

utils.mathematical: fixed imports needed in 'dot_product'

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ars/utils/mathematical.py

 deal with homogeneous transforms; convert angles and other structures.
 """
 
-#import itertools
+import itertools
 from math import sqrt, pi, cos, sin, acos, atan, atan2, degrees, radians
-#import operator
+import operator
 
 import numpy as np