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What does “the process that generates the data” mean? and How does feature selection help in recovering it?

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( 5 months ago )

In [1], one of the motivations to use feature selection is stated to be: "to gain knowledge about the process that generated the data".

What does this "process" actually mean? and How does feature selection help in recovering it?

[1] Guyon, Isabelle, and André Elisseeff. "An introduction to feature extraction." Feature extraction. Springer Berlin Heidelberg, 2006. 1-25.

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