CMU DESIGN GOALS Kevin T Kelly Hanti Lin
- Slides: 70
CMU DESIGN GOALS { Kevin T. Kelly , Hanti Lin } Carnegie Mellon University CMU Responsiveness
Qualitative Reasoning that Tracks Conditioning
Qualitative Reasoning that Tracks Conditioning
Qualitative Reasoning that Tracks Conditioning stic i l i b ing a b Pro dition con
Qualitative Reasoning that Tracks Conditioning stic i l i b ing a b Pro dition con Ac cep tan ce
Qualitative Reasoning that Tracks Conditioning stic i l i b ing a b Pro dition con Ac cep tan ce al n o iti ion s o p is Pro ef rev i bel
Qualitative Reasoning that Tracks Conditioning stic i l i b ing a b Pro dition con Ac cep tan ce al n o iti ion s o p is Pro ef rev i bel
Qualitative Reasoning that Tracks Conditioning stic i l i b ing a b Pro dition con Ac = Ac cep tan ce al n o iti ion s o p is Pro ef rev i bel Conditioning + acceptance = acceptance + revision
Pre-established Harmony tic s i l i ab ing b o Pr ion t i d con Ac ce pta nce al n io ion t i os evis p o r Pr lief be
Cheap Bayes With Harmony tic s i l i ab ing b o Pr ion t i d con Eat breakfast? Tie shoes? Ac ce pta nce Get out of bed?
When You Need Bayes… Help! Bayes! tic s i l i ab ing b o Pr ion t i d con Invest? Eat breakfast? Tie shoes? Ac ce pta nce Get out of bed?
Call Him Then e nc o y nl o n itio d Con Invest? Eat breakfast? Tie shoes? Ac ce pta nce Get out of bed?
Call Him Then Thanks. I’ll take it from here e nc o y nl o n itio d Con Invest? TV? Eat breakfast? Tie shoes? Ac ce pta nce Get out of bed?
Expensive Bayes Without Harmony g in n o i it nd o c d te a e ep Invest? TV? R Eat breakfast? Tie shoes? Ac ce pta nce Get out of bed?
Cheap Bayes with Harmony e nc o y nl o n itio d Con Invest? TV? Eat breakfast? Tie shoes? Ac ce pta nce Get out of bed?
LMU Design Principle: Steadiness LMU Steadiness = “Just conjoin the new data with your old propositions if the two are consistent” E B
AGM is Steady A B C
AGM is Steady A C
Non-steady Revision Rule Yoav Shoham A B C
Non-steady Revision Rule Yoav Shoham A C
Non-steady Revision Rule Yoav Shoham A C
Some Shared Design Principles LMU CMU
Consistency Inconsistency is accepted nowhere.
Non-skepticism Every atom A is accepted over some open neighborhood.
Non-Opinionation There is an open neighborhood over which you accept a non-atom and nothing stronger. Av. B
Corner-monotonicity If an atom is accepted, it continues to be accepted along the straight line to the corresponding corner. C
Corner-monotonicity If an atom is accepted, it continues to be accepted along the straight line to the corresponding corner. C C C
Sensible Rules Sensible = all four properties. Av. B C C C
Both are Sensible! CMU LMU A A Av. C Av. B T B Bv. C Av. B T C B Bv. C C
Incompatibility Theorem No sensible acceptance rule is both steady and tracks conditioning. Sorry. You can’t have both. consumer designer
A New Paradox of Acceptance A p(. |A v B) A p Av. B B C
A New Paradox of Acceptance A Accept A. p(. |A v B) A Learn its consequence A v B. If you track, you retract A! p Av. B B C
“Cautious” Monotonicity = Hypothetico-Deductive Monotonicity If you accept a hypothesis, don’t retract it when you learn what it entails (i. e. predicts).
A Better Idea? 0. 9 A 0. 8 Av. C Av. B T B Bv. C C
Another New Paradox of Acceptance A p B
Another New Paradox of Acceptance A p p(. |B) B B
Another New Paradox of Acceptance A A p B p(. | B)
Another New Paradox of Acceptance A You will accept A v B no matter whether B or B is learned. But if you track, you don’t accept A v B. A p T p(. |B) B B p(. | B)
Case Reasoning Accept a hypothesis, if you will accept it no matter whether E is learned or E is learned.
Theorem The CMU rule + Shoham revision (non -steady) satisfies: �sensible �tracks conditioning �avoids both new paradoxes
Partial Converse �Shoham revision R sensible R tracks conditioning Implies CMU rule + avoidance of the 2 new paradoxes.
Gettier Without False Lemmas Nobody Gettier case Nogot Somebody Havit = the Truth
CMU Rule Represents it Nobody Nogot Somebody Havit = the Truth
CMU Rule is Unsteady! Nobody “Somebody” is retracted but not refuted. Nogot Somebody Havit
Gettier/Unsteadiness Zones Nobody Nogot Somebody Havit
Shoham Revision vs. AGM Revision Nobody Nogot Havit
Shoham Revision vs. AGM Revision Nobody Nogot Havit “Re-examine your reasons” Nobody Nogot Havit “Trust what you accepted”
Structure Preservation Geometry Logic (0, 1, 0) Acpt (1/3, 1/3) (1, 0, 0) A (0, 0, 1) B C
Some Clear Cases A B C
Interpolation A B C
What About Here? A B C
Probability Lives in the Unit Cube 111 110 101 011 100 010 001 000
Classical Logic Lives on the Corners 111 110 101 011 100 010 001 000
But What if Logic Filled the Cube? 111 110 101 011 100 010 001 000
Classical Negation 111 110 101 011 100 010 001 000
Partial Negation 111 110 101 011 100 010 001 000
Geologic Close classical logic under Partial negation
Geological Entailment Logical Closure = Sub-crystals
Probability is a Surface in Geologic
Classical Principle of Indifference
Principle of Indifference Completed
Probalogic = Projection of Geologic
Probalogic as Geologic in Perspective
Probalogic as Geologic in Perspective
Projection of Geological Consequences
= Probalogic
Acceptance Should Preserve Logical Structure Acpt
Representation Theorem The CMU rule is the only rule that preserves logical structure (entailment, disjunction and consistent conjunction). Acpt
Feature Checklist for the CMU Rule The CMU rule + Shoham revision satisfies �sensible �tracks conditioning R avoids both new paradoxes R represents no-false-lemma Gettier cases R unique geo-logical representation
THANK YOU! The CMU rule + Shoham revision satisfies �sensible �tracks conditioning R avoids both new paradoxes R represents no-false-lemma Gettier cases R unique geo-logical representation
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