"Bayer, Samuel" <sam@xxxxxxxxx> writes: > One concrete question, I suppose, is: the classic TF/IDF search strategy relies on inverse document frequency, which looks across the corpus. I can't tell whether that corpus-wide frequency information is taken into account in either ranking function. The documentation is pretty clear that they don't, they just consider each document in isolation. Building a structure that would allow more-global info to be taken into account is an interesting project that nobody's tackled. regards, tom lane
