spotting trends: the wisdom of the few
DESCRIPTION
Spotting Trends: The Wisdom of the Few http://bit.ly/P58BvjTRANSCRIPT
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Spotting TrendsThe Wisdom of the Few
Xiaolan Sha◦ Daniele Quercia✦Pietro Michiardi•
Matteo Dell’Amico•
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Our Work
What are the trends one might be interested in?
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What Is a Trend
Trending
≠Popular
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Who Create Trends
Trend Makers
Trend Spotters{
Influentials
Accidental}A COMBINED
PROCESS
(upload)
(vote)
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Our Context
SPECIALTechnology-Savvy
Design-Conscious
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9,316 users, 6,395 items and 21,252 votes
Our Context
A core group of users are main content contributors.
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Traditional
Preference Matrix
p(u,i) = 1 if u likes i, otherwise 0item i
user u
Recommend
ALG
OR
ITH
M
Items
Users
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Trend-awareRecommendation
User Space
Trend Spotters
Trend Makers
Recommend Trends
Identify Trends
Item Space
Our Approach
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A Special Few
{Activity
Content
Social Network
Geography
Features
SVMUser Space
Trend Spotters
Trend Makers
?
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A Special Few
{if uploaders are trend makers of any quality
if voters are trend spotters - only of high quality
Logistic Regression
Trends
Item Space
?
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Trend-aware
Trends
Trend Space
Trend-aware Preference Matrix
p(u,i) = 1 if u likes trend itrend i
user u
Recommend Trends
SVD
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Trend-awareRecommendation
User Space
Trend Spotters
Trend Makers
Recommend Trends
Identify Trends
Item Space
Our Approach
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Preference Matrix
p(u,i) = 1 if u likes i and item i is a trend, otherwise 0
item i
user u
Recommend
ALG
OR
ITH
M
Items
Users
Baseline
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Evaluation
Recall(N) = #hits / |T|Precision(N) = #hits / (N * |T|)
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Summary
Popular ≠ Trends
Trend Spotters & Makers Exist ! Identify them improve the recommendation.
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Spotting Trends: The Wisdom of the FewXiaolan Sha, Daniele Quercia, Pietro Michiardi, Matteo Dell’Amico
Thank You!