I'm trying to understand t-SNE better and I was hoping someone could elaborate on how the $\sigma _i$'s are chosen.

I was also wondering why they aren't just calculated in the normal way standard deviation is calculated from the data with $x_{i} $ as the expected value for each $\sigma _i$?

  • $\begingroup$ I'm wondering if someone has an answer to this question? How are the standard deviations computed for the Gaussian or t-distribution whose mean is in each point? $\endgroup$
    – Sos
    Aug 3, 2018 at 16:06


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