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Knowledge Representation and Machine Learning Stephen J. Guy
Overview ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Knowledge Representation? ,[object Object],[object Object],[object Object],[object Object]
Knowledge Representation? ,[object Object],[object Object]
Early Work ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Early Work - Theme ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Generality ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
First order Logic - Problems ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
First order Logic - Bigger Problem ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Machine Learning ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Artificial Neural Networks (ANN) ,[object Object],[object Object],[object Object],Inputs: I 1 , I 2 , … Output:  O Responses: R 1 , R 2 , …
Artificial Neural Networks (ANN) ,[object Object],[object Object],[object Object],[object Object],Inputs: I 1 , I 2 , … Output:  O Responses: R 1 , R 2 , …
Single Layer feed-forward ANNs (Perceptrons) Input Layer Output Unit ,[object Object],[object Object],[object Object],[object Object],[object Object]
Learning in Perceptrons ,[object Object],[object Object],[object Object],[object Object],[object Object]
Multi Layer feed-forward ANNs ,[object Object],[object Object],Input Layer Output Unit Hidden Layer
Learning in Multilayer ANNs (1/2) ,[object Object],[object Object],[object Object]
Learning in Multilayer ANNs (2/2) ,[object Object],[object Object],[object Object]
ANN - Summery ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
ANN – In Robots (Simple) ,[object Object],[object Object],[object Object],[object Object]
ANN – In Robots (Complex) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Bayesian Networks ,[object Object],[object Object],[object Object]
Bayes’ Rule ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Bayesian Networks ,[object Object],[object Object],[object Object],[object Object],[object Object],P(M) = 1/50000  M  P(S) T  .5 F  1/20 Meningitis Stiff Neck
Bayesian Networks (Temporal Models) ,[object Object],[object Object],[object Object],Rain t-1 Umbrella t-1 Rain t Umbrella t Rain t+1 Umbrella t+1
Bayesian Networks (Temporal Models) ,[object Object],[object Object],[object Object],[object Object],[object Object],Rain t-1 Umbrella t-1 Rain t Umbrella t Rain t+1 Umbrella t+1
Bayesian Networks (Temporal Models) ,[object Object],[object Object],[object Object],[object Object],[object Object],Rain t-1 Umbrella t-1 Rain t Umbrella t Rain t+1 Umbrella t+1
Bayesian Networks (Temporal Models) ,[object Object],[object Object],[object Object],[object Object],[object Object],Rain t-1 Umbrella t-1 Rain t Umbrella t Rain t+1 Umbrella t+1
Bayesian Networks - Summary ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Bayesian Networks in Robotics ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Robot going through doorway using Bayesian networks (Univ. of Basque)
Reinforcement Learning ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Reinforcement Learning - Example ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],start -1 1 .1 .1 .8
Reinforcement Learning - Policy ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],start -1 1
Reinforcement Learning - Utility ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],1 2 3 1 2 3 4 S’ 1 2 3 1 2 3 4
Reinforcement Learning – Policy ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Reinforcement Learning in Robotics ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Summary ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
References ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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ML and KR Techniques for Knowledge Representation

  • 1. Knowledge Representation and Machine Learning Stephen J. Guy
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Editor's Notes

  1. http://gizmodo.com/gadgets/robots/kurzweil-foresees-borgs-by-2045-128119.php
  2. Quote from R&N (pg 19) STUDENT developed by Daniel Bobrow Image from (http://library.thinkquest.org/2705/Programs.html)
  3. “ Can capture commonsense …” R&N pg 240
  4. PROLOG programming language allows programming entirely in first order logic
  5. All we knew was “brains are binary” “have neuraons”
  6. Proof by (McCulloch & Pitts, 1943)
  7. Minkeys result killed ANNs for over a decade
  8. For threshold function g’(in) term is ommited
  9. Optimal Brain Damage Optimal
  10. http://www.generation5.org/content/2005/neuroLego.asp
  11. Nrm, mean normalize the vector, example Nrm<.3,.4> = <.6,.8>
  12. http://citeseer.ist.psu.edu/cache/papers/cs/32945/http:zSzzSzscsx01.sc.ehu.eszSzccwrobotzSzframeszSzpublicationszSzpaperszSzlazkano03door.pdf/door-crossing-behavior-for.pdf http://www.actapress.com/PaperInfo.aspx?PaperID=23199
  13. Example from R&N
  14. ADP and TD can both be modified to handle Active Reinforment
  15. U(1,4) = 1, U(2,4) = -1 S’ is neighboring states to s
  16. http://www.tecnun.es/asignaturas/control1/proyectos/pdobleinv/evideo.htm