Machine Learning. Professor Sridhar Mahadevan

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1 Machine Learning Professor Sridhar Mahadevan Lecture 1 Home page:www-edlab.cs.umass.edu/cs689 Quizzes, mini-projects: moodle.umass.edu Discussion forum:piazza.com CMPSCI 689 p. 1/35

2 What is "Learning"? Motor skills: walk, drive a bicycle, drive, play tennis or golf, play the piano. Language: Speech recognition, read and write natural languages Spatial knowledge: Navigate between spatial locations, physical layout of a room. Symbolic knowledge: algebra, arithmetic, calculus. Social rules: how to interact with people, animals, machines... CMPSCI 689 p. 2/35

3 What Activity is Shown Here? 32 CMPSCI 689 p. 3/35

4 The Challenge of Learning How is it possible that animals and humans are able to learn so much knowledge from a relatively small number of examples? Most of what is learned is already built-in (The Blank Slate, Steve Pinker). The brain is hardwired to learn specific classes of functions (e.g., language, faces, motor control). Evolution has equipped the brain with some amazingly clever algorithms. The brain is massively parallel with a 100 billion slow" unreliable computing units (neurons). CMPSCI 689 p. 4/35

5 Abstract Definition of "Learning" "Learning" denotes changes in a system that are adaptive in that they enable the system to perform the same task or similar tasks drawn from the same population better over time (Herbert Simon, 1980). Learning denotes knowledge acquisition in the absense of explicit programming (Valiant, 1986). CMPSCI 689 p. 5/35

6 Why should Machines "Learn"? "Learning" can be viewed as a form of implicit programming. Imagine a robot that learns to play tennis by observing people play, and by trial and error. If the task changes over time, learning can make a machine adaptive. Learning may enable a machine to outperform human programming. CMPSCI 689 p. 6/35

7 Why Study Machine Learning? If you invent a breakthrough in artificial intelligence, so machines can learn, that is worth 10 Microsofts. Bill Gates quoted in NY Times, Monday March 3, CMPSCI 689 p. 7/35

8 IBM Jeopardy Quiz Program CMPSCI 689 p. 8/35

9 Speech Recognition on Smart Phones CMPSCI 689 p. 9/35

10 Imagenet Vision Challenge CMPSCI 689 p. 10/35

11 Mapping Images to Text CMPSCI 689 p. 11/35

12 Autonomous Driving CMPSCI 689 p. 12/35

13 Machine Learning on Mars CMPSCI 689 p. 13/35

14 First Machine Learning Program CMPSCI 689 p. 14/35

15 Work done at the ALL Lab CMPSCI 689 p. 15/35

16 Google Deep Mind CMPSCI 689 p. 16/35

17 Reinforcement Learning in the Brain CMPSCI 689 p. 17/35

18 Related Fields Biology: Brain, Development, Evolution, Genetics, Neuroscience. Information Theory: Coding Theory, Entropy. Linguistics: Grammars, Language acquisition Mathematics: Calculus, Linear Algebra, Optimization. Psychology: Analogy, Concept Learning, Curiosity, Discovery, Memory, Reinforcement Philosophy: Causality, Induction, Theory Formation Statistics: Probability Distributions, Estimation, Hypothesis Testing. CMPSCI 689 p. 18/35

19 Learning as Search The process of learning can be viewed as one of searching through a space of hypotheses H for one that best fits the data. The data can be viewed as samples from a (known, unknown) probability distribution The data can be discrete (e.g., rooms in a building, words, web pages), or continuous (sensor measurements). The data may be labeled (category or reward signal) or unlabeled CMPSCI 689 p. 19/35

20 Data Modeling Data from a known distribution: Assumes that the data is coming from a specific class of distributions P(x θ) (e.g., Multinomial, Normal, Poisson) Models: Logistic regression, Mixure model, Hidden Markov Model, Dynamic Bayes Nets. Distribution-free learning: Examples: Deep learning, Decision trees, Nearest Neighbor, Support Vector Machines, Manifold learning. CMPSCI 689 p. 20/35

21 Problem Formulations Density estimation: Unsupervised learning Estimate (joint) distribution of the data P(X) Classification: Supervised learning Estimate conditional distribution P(Y X) Regression: Function approximation Estimate conditional mean E(Y X) Reinforcement Learning: Control learning Learn a policy π mapping states (S) to actions (A) that maximize long-term rewards (R). CMPSCI 689 p. 21/35

22 The Indus Script Fig. 1. An example of an Indus seal, showing the three 4000 year old undeciphered language CMPSCI 689 p. 22/35

23 Deciphering the Indus Script CMPSCI 689 p. 23/35

24 Markov Model CMPSCI 689 p. 24/35

25 Is the Indus Script a Language? CMPSCI 689 p. 25/35

26 Limitations of Learning Computational learning theory (Gold, 1960s; Valiant, 1986; Vapnik and Chervonenkis, 1974) A "complexity"-theory distribution-free model of learning. This theory identifies conditions under which reliable learning is possible. Makes rich connections to algorithmic hardness results (complexity classes). Led to some of the best machine learning algorithms (support vector machines). CMPSCI 689 p. 26/35

27 PAC Learning Given a class H of functions on a space of instances X, a fixed but unknown distribution P on X, how many examples are needed to "learn" any f H? Learner outputs an approximation h whose true error w.r.t. P is ǫ,0 < ǫ < 1. Learner converges to a good approximation with probability 1 δ,0 < δ < 1. Finite H: Learner needs m 1 ǫ examples. ( log( 1 δ )+log( H )) General H: m 1 ǫ ( log( 1 δ )+VC(H)) CMPSCI 689 p. 27/35

28 Administrivia Class lectures: M/Wed 2:30-3:45, Room 142 My office hours: M/Wed 1:30:-2:30, Room 204 TAs: Clemens Rosenbaum, Francisco Garcia Get a class account onpiazza.com Ed lab account onelnux*.cs.umass.edu (MATLAB) CMPSCI 689 p. 28/35

29 Recommended Texts Kevin Murphy, Machine Learning: A Probabilistic Approach, MIT Press, Richard Sutton and Andrew Barto, Reinforcement Learning: An Introduction, MIT Press, Hastie, Tibshirani, and Friedman, Statistical Learning, Springer-Verlag (2nd edition). (available online) David Mackay, Information Theory, Inference, and Machine Learning (Cambridge Univ. Press). (available online) CMPSCI 689 p. 29/35

30 Background Material Linear algebra (e.g., Strang) Statistics (e.g., Casella and Berger) Optimization (e.g., Boyd and Vanderberghe (available online)) Multivariate calculus (e.g., Lagrange multipliers) CMPSCI 689 p. 30/35

31 Many Software Resources MATLAB (available on edlab machines) Python ML packages R and RStudio statistics package Weka Java based ML package Theano, Torch, Caffe, Mocha: deep learning packages CMPSCI 689 p. 31/35

32 Course Outline September October November Unsupervised Learning Supervised Learning Reinforcement Learning CMPSCI 689 p. 32/35

33 Weekly Readings and Course Project Readings: See class web page Final project: Oct 19th: Preliminary project proposal Dec 7th, 9th: Final project presentations. CMPSCI 689 p. 33/35

34 Course Grading Section Weight Mini projects 30% Quizzes 30% Final Project 30% Independent Activities 10% CMPSCI 689 p. 34/35

35 Reading for Next Week Read the survey article "A Few Useful Things to Know About Machine Learning" by Pedro Domingos (see Moodle for paper or class web page). Read Chapter 1 in Murphy textbook Review basic concepts from linear algebra: matrices, vector spaces, subspaces, eigenvalues/eigenvectors, orthogonality. Review basic probability/statistics: random variables, distributions, moments (means, variances). CMPSCI 689 p. 35/35

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