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Removing term independence

  • In general, index terms aren’t independent

  • Dependencies can be complex

  • van Rijsbergen (1979) proposed model of simple tree dependencies

    • Exactly Friedman and Goldszmidt’s Tree Augmented Naive Bayes (AAAI 13, 1996)

  • Each term dependent on one other

  • In 1970s, estimation problems held back success of this model

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