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Good and Bad News

  • Standard Vector Space Model

    • Empirical for the most part; success measured by results

    • Few properties provable

  • Probabilistic Model Advantages

    • Based on a firm theoretical foundation

    • Theoretically justified optimal ranking scheme

  • Disadvantages

    • Making the initial guess to get V

    • Binary word-in-doc weights (not using term frequencies)

    • Independence of terms (can be alleviated)

    • Amount of computation

    • Has never worked convincingly better in practice


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