ExtentsBasedHeadline

Last edit

Changed: 4c4,10

< we already use to compute [NewExtentsBasedRanking|ranks].

to

> we already use to compute [[NewExtentsBasedRanking|ranks]].
> * Get extents
> * Order extents by ''importance''
> * Choose 2-3 extents
> We want headline to be informative, so extents should be <b>dense</b>
> (''more'' query terms in ''shorter'' text) and <b>dispersed</b> (more ''different'' query terms).
> Heuristics:


Extents based Headline

headline() produces text fragments with query terms to help users identify search results. It's tempting to use extents, which we already use to compute ranks.

  • Get extents
  • Order extents by importance
  • Choose 2-3 extents

We want headline to be informative, so extents should be dense (more query terms in shorter text) and dispersed (more different query terms). Heuristics: