Improve personalization for users of large sites #8
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Allow callers to specify a
section
name that the classifier canuse to develop a topics list, to improve personalization for users
of large, multi-topic sites.
If the topic list is per-hostname, a user of a large general-interest
site may receive inadequate personalization compared to a user of
multiple niche sites with only a few topics per site.
For example, a classifier might map a large news site's hostname to
the topics "real estate", "political news", and "crossword puzzles"
resulting in sub-optimal personalization for the users who primarily
visit the site for its fashion coverage, electronics reviews,
or parenting advice.
Without section information, a general-interest video hosting or
social site would also provide very little helpful personalization
info to its users, while it receives helpful personalization info
as a result of the same people's visits to small sites that cover
only a few topics.
A section can be any subdivision of a site, including a "channel"
"group" or "space."
Fixes #17