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Replace eval metric with lenskit TopN (#15)
Prior values for first 10 users: ``` evaluation using the first 1 is NDCG@5 = 0.5, NDCG@10 = 0.5, RR = 0.3333333333333333 evaluation using the first 2 is NDCG@5 = 0.3391602052736161, NDCG@10 = 0.41039156802332444, RR = 0.2142073313555942 evaluation using the first 3 is NDCG@5 = 1.0, NDCG@10 = 1.0, RR = 1.0 evaluation using the first 4 is NDCG@5 = 0.9197207891481876, NDCG@10 = 0.9197207891481876, RR = 0.6666666666666666 evaluation using the first 5 is NDCG@5 = 0.0, NDCG@10 = 0.0, RR = 0.038461538461538464 evaluation using the first 6 is NDCG@5 = 0.0, NDCG@10 = 0.0, RR = 0.030303030303030304 evaluation using the first 7 is NDCG@5 = 0.38685280723454163, NDCG@10 = 0.38685280723454163, RR = 0.2 evaluation using the first 8 is NDCG@5 = 0.0, NDCG@10 = 0.0, RR = 0.02658371040723982 evaluation using the first 9 is NDCG@5 = 0.43067655807339306, NDCG@10 = 0.43067655807339306, RR = 0.25 evaluation using the first 10 is NDCG@5 = 0.0, NDCG@10 = 0.0, RR = 0.03125 ``` Lenskit eval values for first 10 users: ``` evaluation using the first 1 is ndcg5 = 0.6309297535714575, ndcg10 = 0.6309297535714575, mrr = 1.0 evaluation using the first 2 is ndcg5 = 0.2807721888661444, ndcg10 = 0.35123899361230887, mrr = 1.0 evaluation using the first 3 is ndcg5 = 1.0, ndcg10 = 1.0, mrr = 1.0 evaluation using the first 4 is ndcg5 = 0.8154648767857288, ndcg10 = 0.8154648767857288, mrr = 1.0 evaluation using the first 5 is ndcg5 = 0.0, ndcg10 = 0.0, mrr = 1.0 evaluation using the first 6 is ndcg5 = 0.0, ndcg10 = 0.0, mrr = 1.0 evaluation using the first 7 is ndcg5 = 0.43067655807339306, ndcg10 = 0.43067655807339306, mrr = 1.0 evaluation using the first 8 is ndcg5 = 0.0, ndcg10 = 0.0, mrr = 1.0 evaluation using the first 9 is ndcg5 = 0.5, ndcg10 = 0.5, mrr = 1.0 evaluation using the first 10 is ndcg5 = 0.0, ndcg10 = 0.0, mrr = 1.0 ```
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