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Well. Sure, they are different. They have different values. But although I have to admit that this is not really a satisfactory answer, it answers my question at least implicitly: There are some magic factors and guesses involved, and the implementation may have some degrees of freedom (only justified by how well they work in one or the other case).
Apologies if this is not an "issue", but rather a question that I have about the implementation (or my lack of understanding thereof).
The paper says in section 3.1 (and in the pseudocode of Algorithm 1)
The actual implementation of the symmetrization in
tsne.cpp
, line 112 seems to bethus not dividing by
2n
, but by the sum of all elements.Which one is right?
My gut feeling is: It does not matter. Both achieve the same goal. But then, I wonder why the effort of computing the sum is undertaken.
Am I overlooking something here?
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