code: def pearson_score(list1, list2):
      
      size = len(list1)
      sum1 = sum(list1)
      sum2 = sum(list2)
      sum_sq1 = sum([pow(l, 2) for l in list1])
      sum_sq2 = sum([pow(l, 2) for l in list2])
  
      prod_sum = sum([list1[i] * list2[i] for i in range(size)])
  
      num = prod_sum - (sum1 * sum2 / float(size))
      den = sqrt((sum_sq1 - pow(sum1, 2.0) / size) *
                 (sum_sq2 - pow(sum2, 2.0) / size))
  
      return num / den
docs: Compute the Pearson' score between 2 lists of vectors.