[amelius]

(removed explanation because it seems not appreciated)

[vedant]

This is a heap of nonsense. Not only does this summarily dismiss the enormous challenges in digital signal processing required for removing arbitrary background audio, it exposes some confusion associated with the ideas of correlated random variables, inner products, and affine transformations.

[amelius]

> it exposes some confusion associated with the ideas of correlated random variables, inner products

Read this article, then come back: [1]

[1] https://en.wikipedia.org/wiki/Cross-correlation

[xapata]

> (removed explanation because it seems not appreciated)

I think describing the reaction as lack-of-appreciation is a bit misleading. Perhaps disbelief might be a better description.

[amelius]

For the wrong reasons. See my response.

[xapata]

Since you deleted the original comment, it's hard to evaluate it. I think you should have left it there.

[mmmmmbop]

So they're doing this vector correlation for every song in their database (40 million)?