MAP is not correctly implemented.

[yoongi0428]

"relevent_num" should be minimum value between (k, # ground truth).
Isn't "np.cumsum" supposed to be "np.array"?

NeuRec/evaluator/backend/python/metric.py

Line 39 in 91ef5e7

relevant_num = np.cumsum([min(idx+1, len(ground_truth)) for idx, _ in enumerate(rank)])