ConceptCo-occurrence Matrix
Co-occurrence Matrix
The core intermediate data structure of the ItemCF algorithm. It records the co-occurrence counts or weighted counts between item pairs and is used to compute item similarity.
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Oct 18
ItemCF's co-occurrence matrix C[i][j] represents the number of users who have consumed both item i and item j; its size is the square of the number of items, but only non-zero entries need to be stored.
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