Ryan McKinley wrote:
Andrzej Bialecki wrote:
Lukas Vlcek wrote:
So staring will be accommodated only during indexing phase. Does it
mean it
will be pretty static value not a dynamically changing variable...
correct?
In other words if I add my starts to some document it won't affect the
scoring immediately but after indexing cycle. Correct?
(I'm not involved in Wikia development). There are some ways to go
about it even in the pure Lucene-land, so that the updates are fast
without reindexing the main content. Hint: ParallelReader.
in solr (1.3-dev) you can have an external value source with a function
query...
True, although function query tends to bring more overhead ...
While we're on the subject of complex scoring - I read an interesting
paper (I don't have a link now), which discussed a so called bucketed
scoring. The idea is that if your basic scoring is good enough to ensure
that top-N results are highly relevant, then you can split these results
into buckets of k documents (let's say 10 ;) ), and within each bucket
apply arbitrary re-ranking function, which is then very inexpensive to
perform because of the limited number of documents.
Example: you have a large corpus of web pages, and you want home pages
to appear first, even if they score somewhat lower - and it doesn't pay
off to modify the base scoring, because of overfitting, i.e. the scoring
would be good for home pages but poor for other relevant documents.
--
Best regards,
Andrzej Bialecki <><
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