practical-recommender-systems/moviegeek

The value of similarity matrix may be wrong

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yoheimiyamoto commented

Chapter8 Collaborative filtering in the neighborhood

8.4 Amazon's algorithm to precalculate item similarity

Sim("MIB", "ST") was 0.016 with the following calculation .
Screen Shot 2022-05-28 at 9 22 33

However, in the Similarity matrix explained later, a completely different value is set, Sim (MIB, ST) is 0.63.

Table 8.4
Screen Shot 2022-05-28 at 9 23 44
.

pprafaellima commented

I've noticed the same issue. Have you figured out?