Natural Language Processing in Action, Second Edition MEAP V07 by meap-version-7.html

Author:meap-version-7.html
Language: eng
Format: epub, pdf

Let’s start with VT - or rather, with its transposed version V. V matrix’s columns are sometimes called principal directions, and sometimes principal components. As scikit-learn library, which you utilize in this chapter, uses the latter convention, we’re going to stick to it as well.

You can think of V as a "transformer" tool, that is used to map your data from the "old" space (its representation in matrix W’s "world") to the new, lower dimensional one. Imagine our we added a few more points to our 3-D horse point cloud and now want to understand where those new point would be in our 2-D representation, without needing to recalculate the transformation for all the points. To map every new point q to its location on a 2-D plot, all you need to do is to multiply it by V: qht = q V

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