Table A2.

Hyperparameter values for content based and hybrid KNN recommender algorithms.

Algorithm	Hyperparameter	Movielens 20M
ItemKNN CBF	topK	1000
	shrink	1000
	similarity	cosine
	normalize	True
	feature weighting	TF-IDF
ItemKNN CF CBF	topK	253
	shrink	203
	similarity	cosine
	normalize	True
	feature weighting	BM25
	ICM weight	0.1520

Only Movielens 20M contains item features, the other datasets are, therefore, omitted.