Jure Leskovec Stanford University. Large on-line applications with hundreds of millions of users The...
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Transcript of Jure Leskovec Stanford University. Large on-line applications with hundreds of millions of users The...
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Web – The Lab for Humanity
Large on-line applications
with hundreds of millions of
users
The Web is my “laboratory”
for understanding
the pulse of humanity.
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But, where are we going?
Observations:
Big data
Models: Predictions
Algorithms: Applications
Actively influencing the system
15
Changing the Behavior
… to evolve into a “happy” network?
How to change human
behaviors..
Observations: Data
analysis
Models: Predictions
Algorithms: Applications
Actively influencing the system
20
Predicting links onWe get ~50% of them right
But, what is global utility?
Observations: Data
analysis
Models: Predictions
Algorithms: Applications
Actively influencing the system
Example: Utility of links
vs.
How to evolve into a “happy” network?
Too sparseToo
“cluttered”
Reflections
Why are networks organized the way they are?Build models/understandingMake predictions
Large dataObserve/model patterns not
visible at smaller scales
“The future is already here — it just is unevenly distributed”
William Gibson
THANK YOUhttp://
snap.stanford.edu
Physchohistory
Three axioms of Physchohistory:Detailed data about the population
Population should be sufficiently large
The population should remain in ignorance of the results
Can we do it today?
What’s next? combines history, sociology, and
mathematical statistics to make (nearly) exact predictions of the collective actions of very large groups of people, such as the Galactic Empire.
What’s next? psychohistorians, masters of an
esoteric mathematical science that enables them to plan for the future of their galactic civilization and realize their plans by making minimal changes in the society around them
Seriously Psychohistory depends on the idea that, while one cannot
foresee the actions of a particular individual, the laws of statistics as applied to large groups of people could predict the general flow of future events.
Asimov used the analogy of a gas: an observer has great difficulty in predicting the motion of a single molecule in a gas, but can predict the mass action of the gas to a high level of accuracy
If we’d want to predict future we would need: The population whose behavior is modeled should be sufficiently
large The population should remain in ignorance of the results