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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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