Information Retrieval Challenges

at io n In fo rm l ri ev a R et en ges C h a ll Bruno Pedro March 2010

Bruno Pedro A n e x p e r i e n c e d We b d e v e l o p e r a n d entrepreneur. Has extensive background in large scale projects and technical writing. http://tarpipe.com/user/bpedro

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3 Challenges • Real-Time Retrieval • Understanding Context • Inferring Identify

Real-Time Retrieval http://www.ﬂickr.com/photos/josephrobertson/127758523/

WordPress source: wordpress.com • Average ~10K posts/hour • ~3 new posts every second

twitter source: mashable.com • Average ~1.1M tweets/hour • ~300 new tweets every second

Challenge • ~300 reads/second • 160 X 300 = 48 KB/second = 4 GB/day (approximate calculation) • How to process all this information?

Strategy • Read and store immediately: • High performance write storage • No locks allowed • Prepare for lots of reading errors

Strategy • Process later: • Regular expressions • Term extraction • Machine learning

Context For me context is the key - from that comes the understanding of everything. — Kenneth Noland

source: joelonsoftware.com Dogs?

source: Google Reader Play Dogs with unmatched title?

source: Google Buzz Still doesn’t make a lot of sense...

This is the worst case scenario

Challenge • Find context from associated content: • Pictures • Comments • Location information • Timelines • Authors

Strategy • Associate content through common identiﬁers • Establish timeline of different pieces • Group pieces by same author • Present in a comprehensible fashion

Identity source: abc Australia

Many Identiﬁers • E-mail: user@example.com • facebook: @User Name • ﬂickr: user or User Name (?) • Google Buzz: @user@example.com • twitter: @user ...

Addressable • http://facebook.com/user • http://ﬂickr.com/user • http://www.google.com/proﬁles/user • http://twitter.com/user ...

How to make sense?

Challenge • Parse every message, tweet or post • Find possible user identiﬁers • Substitute for meaningful information: • A link to the original proﬁle • Equivalent identity on destination

Strategy • Decentralized processing: • Browser based (plugin) • Extract identities from page • Process • Replace with meaningful information

Food for thought • PubsubHubbub http://code.google.com/p/pubsubhubbub/ • Activity Streams http://activitystrea.ms/ • Web Finger http://webﬁnger.org/

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Information Retrieval Challenges

by Bruno Pedro on Mar 20, 2010

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