General Definition
In general terms, the expected information gain is the change in information entropy from a prior state to a state that takes some information as given:
Where denotes the information entropy.
Read more about this topic: Information Gain In Decision Trees
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“The following general definition of an animal: a system of different organic molecules that have combined with one another, under the impulsion of a sensation similar to an obtuse and muffled sense of touch given to them by the creator of matter as a whole, until each one of them has found the most suitable position for its shape and comfort.”
—Denis Diderot (1713–1784)
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