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What and Who
Title:Trace Complexity
Speaker:Flavio Chierichetti
coming from:Sapienza University of Rome
Speakers Bio:Flavio Chierichetti is an assistant professor in the Department of Computer Science at Sapienza University of Rome.
Event Type:SWS Colloquium
Visibility:D1, D2, D3, D4, D5, SWS, RG1, MMCI
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Level:Expert Audience
Language:English
Date, Time and Location
Date:Wednesday, 30 July 2014
Time:10:30
Duration:60 Minutes
Location:Saarbrücken
Building:E1 5
Room:029
Abstract

Prediction tasks in machine learning usually require deducing a latent variable, or structure, from observed traces of activity — sometimes, these tasks can be carried out with a significant precision, while sometimes getting any significance out of the prediction requires an unrealistically large number of traces.

In this talk, we will study the trace complexity of (that is: the number of traces needed for) a number of prediction tasks in social networks: the network inference problem, the number of signers problem, and the star rating problem.

The first problem was defined by [Gomez-Rodriguez et al, 2010] and consists of reconstructing the edge set of a network given traces representing the chronology of infection times as epidemics spread through the network.
The second problem’s goal is to predict the unknown number of signers of email-based petitions, given only a small subset of the emails that circulated.
The last problem aims to predict the unknown absolute "quality" of a movie using the ratings given by different users (each with their own unknown precision)

These examples will allow us to highlight some interesting general points of prediction tasks.

Joint work with subsets of Bruno Abrahao, Anirban Dasgupta, Bobby Kleinberg, Jon Kleinberg, Ravi Kumar, Silvio Lattanzi and David Liben-Nowell.

Contact
Name(s):Brigitta Hansen
Phone:0681 93039102
EMail:--email address not disclosed on the web
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  • Christian Klein, 10/13/2016 05:18 PM
  • Brigitta Hansen, 07/22/2014 02:41 PM -- Created document.