[scikit-learn] Help with improving t-sne

[Shanglun Wang]

Hello,

I am currently working on a ticket on github involving improving the data
structures powering t-sne. I am running into some trouble trying to
conceptually link up what the code is doing and the underlying mathematical
theory. Normally I would just grapple with it, but I feel like I would need
some help to get this ticket done in a reasonable time frame.

Would someone be willing to help me understand the theory underpinning
t-sne, and how that links up with the implementation?

Thank you,

Sean
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