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Categorization/Classification
Given:
A description of an instance, d ∈ X
X is the instance language or instance space.
Issue: how to represent text documents.
Usually some type of high-dimensional space – bag of words
A fixed set of classes:
C = {c1, c2,…, cJ}
Determine:
The category of d: γ(d) ∈ C, where γ(d) is a classification function whose domain is X and whose range is C.
We want to know how to build classification functions (“classifiers”).
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