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Rocchio 1971 Algorithm (SMART)

  • Used in practice:

  • Dr = set of known relevant doc vectors

  • Dnr = set of known irrelevant doc vectors

    • Different from Cr and Cnr           !

  • qm = modified query vector; q0 = original query vector; α,β,γ: weights (hand-chosen or set empirically)

  • New query moves toward relevant documents and away from irrelevant documents


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