Self Organization of a Massive Document Collection. Teuvo Kohonen Samuel Kaski Krista Lagus Jarkko Salojarvi Jukka Honkela Vesa Paatero Antti Saarela. Their Goal. Organize large document collections according to textual similarities Search engine
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sqrt ((r1 – r2)2 + (g1 – g2)2 + (b1 – b2)2 + … )
6 shades of red, green, and blue used as input
Rk x d Xd x N => new matrix Xk x N
“If points in a vector space are projected onto a randomly selected subspace of suitably high dimension, then the distances between the points are approximately preserved”