machine learning meets public policy - neurips · machine learning meets public policy edward w....
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Machine Learning Meets Public Policy
Edward W. FeltenKahn Professor of Computer Science and Public Affairs
Director, Center for Information Technology PolicyPrinceton University
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"AI is probably the most important thing humanity has ever worked on. I think of it as something more profound than electricity or fire.”
Sundar Pichai, Google CEO24 Jan 2018
7
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People who are affected by AI/MLdeserve some say in how it is used.
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Decisions will be made.What is our role in the decisions?
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Truth
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Truth
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Politics is not a search for truth.
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a feature, not a bug
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Democracy is not a search for truth.
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an algorithm for resolving disagreements
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no question is undecidable
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all questions are decidable in O(1) time
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no need to decide underlying facts
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no need for a coherent explanation
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and yet …
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individual legislators seem
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individual legislators seem
logically inconsistent
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individual legislators seem
logically inconsistent
indifferent to truth
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Politicians behave that way for a reason.
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Consider the following model …
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P = universe of proposals = {p0, p1, p2, …}
Assume proposals are independent.
A bill is a subset of P.
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Voter vi supports proposal pj iff Ui(pj) > 0
Voter i has utility function Ui(.)
Define: pj passes iffmajority of voters support pj
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Given two disjoint bills B1, B2:
Ui(B1 U B2) = Ui(B1) + Ui(B2)
Assumption:
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Given two disjoint bills B1, B2:
If Vi supports B1 and Vi supports B2,Then Vi supports B1 U B2
Corollary:
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Given two disjoint bills B1, B2:
If B1 passes and B2 passes,Then B1 U B2 passes
Theorem:
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Given two disjoint bills B1, B2:
If B1 passes and B2 passes,Then B1 U B2 passes
Non-Theorem:
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Voter B1 B2 B1 U B2
Alice 1 -2 -1
Bob -2 1 -1
Charlie 1 1 2
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outputs not logically consistent
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Let’s generalize the model …
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partition voters into districts
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partition voters into districts
legislature: one rep per district
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partition voters into districts
legislature: one rep per district
rep supports B iffmajority of constituents support B
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implications
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legislator not logically consistent
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legislator not logically consistent
supports B1, supports B2
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legislator not logically consistent
supports B1, supports B2
might not support B1 U B2
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legislator doesn’t care about the facts
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individual legislators seem
logically inconsistent
indifferent to truth
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legislative strategy
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Consider the following problem…
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Given:bill Bamendments A1, …, An
(mutually disjoint)
Amendment Problem
Can you add a subset of the Ai to B, to make an amended proposal that will pass?
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Given:bill Bamendments A1, …, An
(mutually disjoint)
Amendment Problem
Can you add a subset of the Ai to B, to make an amended proposal that will pass?
NP-complete!
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Ted Stevens
Nobody knew this could be so complicated.
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real world: even more complicated
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voters not self-consistent
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legislators make deals
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administrative agencies
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indirectly accountable to voters
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locally, system will look irrational
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It’s complicated.
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what to do?
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“It’s not okay to not know how the Internet works.”
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“It’s not okay to not know how government works.”
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good decisions
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just the facts
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dictate the decision
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Who elected you?
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download your brain
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be useful
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your knowledge+
their preferences
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your knowledge+
their knowledge and preferences
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get their knowledge and preferences
structure the decision space
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KnowledgeKnowledgePreferences
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engagement over time
mutual trust
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role of our community
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need boots on the ground
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create a career path
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build incentives
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This is important!
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We need to be in the room.
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Machine Learning Meets Public Policy
Edward W. FeltenKahn Professor of Computer Science and Public Affairs
Director, Center for Information Technology PolicyPrinceton University