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1""" This module presents procedures to convert instances from one type to another. 

2""" 

3from preflibtools.properties.basic import pairwise_scores 

4 

5 

6def order_to_pwg(instance): 

7 """ Takes as input an instances and returns a string describing a pairwise graph. 

8 

9 :param instance: The instance to convert. 

10 :type instance: :class:`preflibtools.instances.preflibinstance.OrdinalInstance` 

11 """ 

12 header = str(instance.num_alternatives) + "\n" 

13 for alt, alt_name in instance.alternatives_name.items(): 

14 header += str(alt) + "," + str(alt_name) + "\n" 

15 header = header 

16 

17 scores = pairwise_scores(instance) 

18 pairwise_relation = "" 

19 sum_vote_count = 0 

20 num_unique = 0 

21 for alt_name1, score_dict in scores.items(): 

22 for alt_name2, score in score_dict.items(): 

23 pairwise_relation += str(score) + "," + str(alt_name1) + "," + str(alt_name2) + "\n" 

24 num_unique += 1 

25 sum_vote_count += score 

26 pairwise_relation = pairwise_relation[:-1] 

27 

28 count_line = str(instance.num_voters) + "," + str(sum_vote_count) + "," + str(num_unique) + "\n" 

29 

30 return header + count_line + pairwise_relation