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Flexible ways of combining term weights, which can generalize previous approaches
Binary independence model
Probabilistic models with weaker assumptions
Efficient large-scale implementation
InQuery text retrieval system from U Mass
Turtle and Croft (1990) [Commercial version defunct?]
Need approximations to avoid intractable inference
Need to estimate all the probabilities by some means (whether more or less ad hoc)
Much new Bayes net technology yet to be applied?
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