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Scalable Machine Learning 3. Data Streams Alex Smola Yahoo! Research and ANU http://alex.smola.org/teaching/berkeley2012 Stat 260 SP 12 3. Data Streams Building realtime *Analytics at home Data Streams Data & Applications • Moments • Flajolet-Martin counter • Alon-Matias-Szegedy sketch • Heavy hitter detection • Lossy counting • Space saving • Semiring statistics • Bloom filter • CountMin sketch • Realtime analytics • Fault tolerance and scalability • Interpolating sketches 3.1 Streams Data Streams • Cannot replay data • Limited memory / computation / realtime analytics • Time series Observe instances (x , t) t stock symbols, acceleration data, video, server logs, surveillance • Cash register Observe instances x (weighted), always positive increments i query stream, user activity, network traffic, revenue, clicks • Turnstile Increments and decrements (possibly require nonnegativity) caching, windowed statistics Website Analytics NIPS • Continuous stream of users (tracked with cookie) • Many sites signed up for analytics service • Find hot links / frequent users / click probability / right now Quer y Stream • Item stream • Find heavy hitters • Detect trends early (e.g. Obsama bin Laden killed) • Frequent combinations (cf. frequent items) • Source distribution • In real time Network traffic analysis • TCP/IP packets • On switch with limited memory footprint • Realtime analytics • Busiest connections • Trends • Protocol-level data • Distributed information gathering Financial Time Series • real time prediction • missing data • metadata (news, quarterly reports, financial background) • time-stamped data stream • multiple sources • different time resolution News • Realtime news stream • Multiple sources (Reuters, AP, CNN, ...) • Same story from multiple sources • Stories are related

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Yahoo! Research and ANU http://alex.smola.org/teaching/berkeley2012. Stat 260 SP 12 stock symbols, acceleration data, video, server logs, surveillance .. Datastructure. • Algorithm d hash functions h1(x) h2(x) h3(x) h4(x) m bins xxx like Bloom filter but with .. https://sites.google.com/site/c

3. Data Streams - Alex Smola - smola.org PDF

92 Pages·2012·10.11 MB·English

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Yahoo! Research and ANU http://alex.smola.org/teaching/berkeley2012. Stat 260 SP 12 stock symbols, acceleration data, video, server logs, surveillance .. Datastructure. • Algorithm d hash functions h1(x) h2(x) h3(x) h4(x) m bins xxx like Bloom filter but with .. https://sites.google.com/site/c

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Author:	Unknown
Publication Year:	2012
Pages:	92
Language:	English
File Size:	10.11
Format:	PDF
Price:	FREE

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