[BUG] sar_movielens.ipynb - top_k = model.recommend_k_items(test, top_k=TOP_K, remove_seen=True) error about recommenders

[Petkomat]

Faced the same problem. I think it's scipy related and that return np.array(result) lines at the end of similarity functions in recommenders/utils/python_utils.py should be changed to return result.toarray().

For example, the new version of jaccard should read as

def jaccard(cooccurrence):
    """<docstring>"""

    diag_rows, diag_cols = _get_row_and_column_matrix(cooccurrence.diagonal())

    with np.errstate(invalid="ignore", divide="ignore"):
        result = cooccurrence / (diag_rows + diag_cols - cooccurrence)

    # return np.array(result) # not this
    return result.toarray()

[moflotas]

@lordaouy I am not sure, but it might be problem with scipy itself
I solved it lowering the version from the latest to scipy==1.10.1 and it worked perfectly

[SimonYansenZhao]

See scipy/scipy#18796 and #1954

[SimonYansenZhao]

Resolved in PR #2083