> However, sometimes the matrix being operated on is not a linear operation, but a set of vectors or data points. In Jeremy Kun's book [1] he argues that in fa

> However, sometimes the matrix being operated on is not a linear operation, but a set of vectors or data points. In Jeremy Kun's book [1] he argues that in fact data matrices _can_ be viewed as linear transformations. See e.g. section 10.9 on the SVD > That is, we’re saying the input is R3 and the basis vectors are people:... > By representing the ratings this way, we’re imposing the hypothesis that the _process_ of rating movies is linear in nature. ... [1] https://pimbook.org/ https://pimbook.org/