[u,v]_similarity incorrect

Bug #402786 reported by Ken Arnold
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Divisi
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Undecided
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Bug Description

I think the u and v_similarity functions in svd.py are incorrect since they use sigma instead of sigma-squared. They should be like:

self.weighted_u(idx1) * self.weighted_u(idx2)

Does anyone use these functions?

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