CSE 571: Artificial Intelligence

Instructor: Subbarao Kambhampatirao@asu.edu

Homepage: http://rakaposhi.eas.asu.edu/cse571Office Hours: Right after the class

3:15—4:15pm BY560

History

• At ASU, CSE 471/598 has been taught as the main introductory AI course– Normally taught by either Rao or Huan Liu

• 571 has been taught as a graduate level AI course– Didn’t necessarily require 471– Didn’t necessarily have a breadth aspect

• Nick Findler taught it for a long time and would focus on distributed AI• Chitta Baral taught it after Nick and would focus on knowledge

representation• Last time Rao taught it was in 1996

– Looking back at that syllabus, it looks like 571 I taught then is a subset of 471 as I teach now

CSE 571 This time?

• “Run it as a Graduate Level Follow-on to CSE 471”

• Broad objectives– Deeper treatment of some of the 471 topics – More emphasis on tracking current state of the art– Training for literature survey and independent

projects

Who are you & what do you want?

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What we did in 471• Week 1: Intro; Intelligent agent design [R&N Ch 1, Ch 2] • Week 2: Problem Solving Agents [R&N Ch 3 3.1--3.5] • Week 3: Informed search [R&N Ch 3 3.1--3.5] • Week 4: CSPs and Local Search[R&N Ch 5.1--5.3; Ch 4 4.3] • Week 5: Local Search and Propositional Logic[R&N Ch 4 4.3; Ch 7.1--7.6] • Week 6: Propositional Logic --> Plausible reasoning[R&N Ch 7.1--7.6; [ch 13 13.1--13.5]]

• Week 7: Representations for Reasoning with Uncertainty[ch 13 13.1--13.5]] • Week 8: Bayes Nets: Specification & Inference[ch 13 13.1--13.5]] • Week 9: Bayes Nets: Inference[ch 13 13.1--13.5]] (Here is a fully worked out example of

variable elimination) • Week 10: Sampling methods for Bayes net Inference; First-order logic start[ch 13.5; ] • Week 11: Unification, Generalized Modus-Ponens, skolemization and resolution refutation. • Week 12: Reasoning with changePlanning • Week 13: Planning, MDPs & Gametree search• Week 14: Learning

Chapters Covered in 471 (Spring 09)• Table of Contents (Full Version)• Preface (html); chapter map

Part I Artificial Intelligence 1 Introduction 2 Intelligent Agents Part II Problem Solving 3 Solving Problems by Searching 4 Informed Search and Exploration 5 Constraint Satisfaction Problems 6 Adversarial Search Part III Knowledge and Reasoning 7 Logical Agents 8 First-Order Logic 9 Inference in First-Order Logic 10 Knowledge Representation Part IV Planning 11 Planning (pdf) 12 Planning and Acting in the Real World

• Part V Uncertain Knowledge and Reasoning 13 Uncertainty 14 Probabilistic Reasoning 15 Probabilistic Reasoning Over Time 16 Making Simple Decisions 17 Making Complex Decisions Part VI Learning 18 Learning from Observations 19 Knowledge in Learning 20 Statistical Learning Methods 21 Reinforcement Learning Part VII Communicating, Perceiving, and Acting 22 Communication 23 Probabilistic Language Processing 24 Perception 25 Robotics Part VIII Conclusions 26 Philosophical Foundations 27 AI: Present and Future

Rao: I could've taught more...I could've taught more, if I'd just...I could've taught more...Yunsong: Rao, there are thirty people who are mad at you because you taught too much. Look at them.Rao: If I'd made more time...I wasted so much time, you have no idea. If I'd just...Yunsong: There will be generations (of bitter people) because of what you did.Rao: I didn't do enough.Yunsong: You did so much.Rao: This slide. We could’ve removed this slide. Why did I keep the slide? Two minutes, right there. Two minutes, two more minutes.. This music, a bit on reinforcement learning. This review. Two points on bagging and boosting. I could easily have made two for it. At least one. I could’ve gotten one more point across. One more. One more point. A point, Yunsong. For this. I could've gotten one more point across and I didn't.

Adieu with an Oscar Schindler Routine.

Schindler: I could've got more...I could've got more, if I'd just...I could've got more...Stern: Oskar, there are eleven hundred people who are alive because of you. Look at them.Schindler: If I'd made more money...I threw away so much money, you have no idea. If I'd just...Stern: There will be generations because of what you did.Schindler: I didn't do enough.Stern: You did so much.Schindler: This car. Goeth would've bought this car. Why did I keep the car? Ten people, right there. Ten people, ten more people...(He rips the swastika pin from his lapel) This pin, two people. This is gold. Two more people. He would've given me two for it. At least one. He would've given me one. One more. One more person. A person, Stern. For this. I could've gotten one more person and I didn't.

Top few things I would have done if I had more time• Statistical Learning• Reinforcement Learning; Bagging/Boosting• Planning under uncertainty and incompleteness• Ideas of induced tree-width• Multi-agent X (X=search,learning..)• PERCEPTION (Speech; Language…)• Be less demanding more often (or even once…)

Things I Know I want to Cover• Search

– Local vs. Systematic– Optimization in continuous domains

• Constraint networks– Tree-width concepts; temporal constraint networks

• Reasoning: Planning– Temporal planning; belief-space planning, stochastic planning– POMDPs; DecPOMDPs?

• KR: Templated Probabilistic Networks– Dynamic probabilistic networks– Relational Probabilistic networks

• Learning: – Relational Learning– Reinforcement learning

Reading Material…Eclectic

• Chapters from the new edition (in preparation) of R&N (in some cases)– First reading: Advanced Search Techniques

chapter (Will be distributed in hardcopy)• Chapters from other books– POMDPS from Thrun/Burgard/Fox– Templated Graphical models from Koller

&Friedman– CSP/Tree-width stuff from Dechter

• Tutorial papers etc

“Grading”?

• 3 main ways– Participate in the class actively. Read assigned

chapters/papers; submit reviews before the class; take part in the discussion

– Learn/Present the state of the art in a sub-area of AI • You will pick papers from IJCAI 2009 as a starting point• http://ijcai.org/papers09/contents.php

– Work on a semester-long project• Can be in groups of two (or, in exceptional circumstances,

3)

Deadlines..

• AAMAS deadline: 10/8/09• KR deadline: 11/10/09• ICAPS deadline: 12/16/09• AAAI deadline: 1/15/10• ICML deadline: ~2/10/10

Discussion

• What are the current controversies in AI? What are the hot topics in AI?

Pendulum Swings in AI

• Top-down vs. Bottom-up• Ground vs. Lifted representation– The longer I live the farther down the Chomsky

Hierarchy I seem to fall [Fernando Pereira]• Pure Inference and Pure Learning vs.

Interleaved inference and learning• Knowledge Engineering vs. Model Learning• Human-aware vs.

The representational roller-coaster in CSE 471

atomic

propositional/(factored)

relational

First-order

State-spacesearch

CSP Prop logic Bayes Nets

FOPCw.o. functions

FOPC Sit. Calc.

STRIS Planning

MDPs Min-max

Decisiontrees

Semester time

The plot shows the various topics we discussed this semester, and the representational level at which we discussed them. At the minimumwe need to understand every task at the atomic representation level. Once we figure out how to do something at atomic level, we always strive to do it at higher (propositional, relational, first-order) levels for efficiency and compactness. During the course we may not discuss certain tasks at higher representation levels either because of lack of time, or because there simply doesn’t yet exist undergraduate level understanding of that topic at higher levels of representation..