Thomas G. Dietterich

E-mail: tgd@cs.orst.edu Phone: +1-541-737-5559 Office: KEC 2067
PGP Public Key
(Last updated September 30, 2015.)

Page Contents: Research Prospective Students Publications Talks CV Software Students and Staff Course Materials Bio Sketch

Current Research

"If you invent a breakthrough in artificial intelligence, so machines can learn," Mr. Gates responded, "that is worth 10 Microsofts." (Quoted in NY Times, Monday March 3, 2004)

The focus of my research is machine learning (and the associated areas of Data Science and Big Data). How can we make computer systems that adapt and learn from their experience? How can we combine machine learning with other advances in AI to build Integrated Intelligent Systems? How can we combine human knowledge with massive data sets to expand scientific knowledge and build more useful computer applications? My laboratory combines research on machine learning and AI fundamentals with applications to problems in science and engineering.

• Scientific Projects
  • Ecosystem Informatics and Computational Sustainability: Oregon State University is a leader in combining computer science and the ecological sciences to build the new discipline of Ecosystem Informatics. Ecosystem Informatics studies methods for collecting, analyzing, and visualizing data on the structure and function of ecosystems. It is an instance of an important new direction in science: Data Exploration Science (see Jim Gray's 2003 KDD talk).

    Oregon State is also part of the Institute for Computational Sustainability led by Cornell University. This effort seeks to develop novel computational methods to address problems in ecosystem science and sustainable management of the biosphere.

    My group is involved in many Ecosystem Informatics and Computational Sustainability activities:

    • Machine Learning for Species Distribution. One of the central goals of ecology is to understand and predict the distribution of species (including the bugs that we are studying in the Insect Identification project). Given a data set that records observations of the presence (or absence) of multiple species at multiple locations, we wish to develop models that can predict their presence/absence elsewhere. We are interested not only in static distribution models, but also in process models that capture the temporal and spatial of species distributions (e.g., bird migration, flight times of moths, return of salmon, spread of invasive species, survival of endangered species, etc.). Our species distribution team includes faculty members (Matt Betts, myself, and Weng-Keen Wong), post-docs Rebecca Hutchinson and Selina Chu, and graduate students Arwen Lettkeman and Liping Liu. We collaborate very closely with the Cornell Laboratory of Ornithology and with the DataONE Datanet. In particular, we are studying methods for dealing with the many shortcomings of the citizen science data collected by the Lab of Ornithology in their eBird project including (a) partial detection, (b) wide range of birder expertise, and (c) highly biased spatial distribution of observations.

    • BirdCast. Another special case of species distribution modeling is understanding bird migration. With the Lab of Ornithology, we are developing methods for reconstructing and predicting bird migration across North America. Our goal is to understand what signals birds use to decide when to migrate and to provide daily forecasts of bird migration by combining eBird reports, weather radar, acoustic monitoring of flight calls, and weather forecasts. The project web site is available here.

    • Approximate Optimization for Bio-Economic Models. Many sustainability applications require solving large spatio-temporal optimization problems under uncertainty. We are collaborating with economists Jo Albers and Claire Montgomery on methods for approximate solution of spatio-temporal optimization problems involving land management for wildfire control and counter-measures for controlling invasive species.

    • Project TAHMO: Deployment, Cleaning, and Analysis of Sensor Network Data. We are part of the Project TAHMO that seeks to construct and deploy a network of 20,000 hydro-meteorological stations in Africa. We are developing algorithms for sensor placement, data cleaning, recovery from damaged sensors, and analysis of the resulting data. We are building on our previous work with Ethan Dereszynski on dynamic Bayesian network models for sensor data cleaning.

    • Arthropod Identification. Our current understanding of complex ecosystems is limited by a lack of data. One particularly useful kind of data is population counts of "bugs" (small arthropods that live in soils, lakes, streams, and the ocean). The BugID project seeks to develop devices for capturing, imaging, and sorting bugs combined with general image processing/machine learning/pattern recognition tools for counting and classifying them. We hope to transform the ability of scientists to measure the health of forests, streams, and estuaries. More generally, we are interested in developing a wide range of novel instruments for expanding the quality, quantity, and spatio-temporal resolution of ecologically-relevant data. Our research also contributes to computer vision and object recognition more generally.

    • NIPS 2012 Posner Lecture: Challenges for Machine Learning in Computational Sustainability.

    • ICML 2011 Tutorial on Machine Learning in Ecology and Ecosystem Management

  • Intelligent Desktop Assistants. We have been involved in two large efforts to develop intelligent assistants for the computer desktop.

    • TaskTracer. When you come into work in the morning, you don't want to say to your computer "I want to run Word", but rather, "I want to work on my CS534 homework". In other words, you would like a user interface that was organized around your projects and activities rather than around application programs, files, folders, etc. You would also like all of your information in one place rather than scattered across the local file system, network file systems, web sites, email folders, calendar, contacts, etc. TaskTracer extends the Windows UI to provide exactly this functionality. This research is supported by DAPRA with previous support from Google, Intel, and the DARPA CALO project. OSU News Service story. Project Web Site.

    • CALO. The goal of the CALO project was to develop an AI personal assistant that can help you find relevant documents, prepare for meetings, keep track of what is going on during meetings, and autonomously execute tasks such as arranging travel, scheduling meetings, executing administrative workflows (e.g., purchasing and staffing), and so on. Our work on CALO focused on developing methods for integrating multiple, separately-engineered components into a single learning and reasoning system. We also prototyped a novel system that employs programming-by-demonstration to define new learning tasks for CALO to solve autonomously. We are currently editing a book describing the results of the CALO project.

  • Next Generation Phenomics. An important goal in biology is to reconstruct the tree of life. As part of the Project AVATOL team, we are developing computer vision and machine learning methods to automatically discover and score phenotype characters (features) from images of biological specimens. These scores can then be combined with other information (e.g., genetic sequences, functional measurements) to reconstruct phylogenetic trees. Phenomic information is particularly valuable for sets of closely-related species (where DNA differences may not reflect functional differences) and for extinct species known only through fossil specimens.

    The computer science challenges involve learning to score known characters, which typically include shape, texture, color, and topological features of specimens, from weakly-labeled data and discovering new characters that are shared across some taxonomic groups but not others.

  • Fundamental Machine Learning and Artificial Intelligence Research

    • Anomaly Detection. An important capability for AI systems is to be able to detect when an input situation is unusual. For example, anomaly detection can allow machine learning systems to detect when an input case is very different from the training data and hence could lead to extrapolation and poor performance. Anomaly detection methods are also important for detecting novel failures in sensor networks and novel attacks on computer systems. We are developing a range of algorithms for anomaly detection under grants from the National Science Foundation and the Future of Life Institute.

      We have also developed a new benchmarking methodology for comparing anomaly detection methods. Benchmark data sets and scripts are available for download.

    • Learning Individual Models from Aggregate Data. Most data in ecology (and other fields) records information in aggregated form (e.g., population counts, census figures). Often, we wish to fit models of individual behavior using such aggregated data. One example is the problem of predicting bird migration from eBird counts. Former Postdoc Dan Sheldon has developed a new formalism, the Collective Grahical Model, that directly transforms individual models to aggregate models that can then be easily linked to aggregated data.

    • Sample-Efficient Algorithms for Solving Markov Decision Processes. We are developing algorithms for solving MDPs in which the state consists of a landscape of patches, and each patch has its own state. This means that the state space is enormous. At each time step, an action must be specified for each patch, so the action space is also enormous. In these problems, phenomena (such as fires, infections, species spread) propagate spatially, so we cannot treat the patches as independent. Our algorithms seek exact (or bounded approximate) solutions for small problem instances, and satisfactory solutions for real-sized problem instances. Our algorithms optimize both expected (discounted) cumulative reward and also risk-sensitive reward measures. The transition probabilities for these models are specified in the form of an expensive simulator which can be invoked with a given state and action to obtain a sample of the resulting state and the reward. An important goal is to minimize the number of calls to the simulator.

    • Software Engineering Methods and Tools for Machine Learning Systems. Creating and maintaining a successful deployed machine learning system is still largely an art that requires a Ph.D. The goal of this research is to develop software engineering methods and tools for creating and maintaining deployed machine learning systems. We are part of the DARPA PPAML program (Probabilistic Programming Advancing Machine Learning), which is developing programming languages that make it easy to create and fit complex machine learning models.

  • Reviews, tutorials, and books. I have written several review articles and tutorials on machine learning.

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  Information for Prospective Students

  If you are seeking a research career in machine learning, data mining, artificial intelligence and related areas, and you have a strong background in mathematics and programming, please read my Information for Prospective Students page.

  If you are interested in robotics, I encourage you to visit the Robotics Team Pages to learn more about our excellent robotics program.

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  Publications, Curriculum Vita, Software, and Data

  • Publications
  • Talks
  • Curriculum Vita
  • Downloadable Collection of Error Correcting Codes for use with the error-correcting output coding technique.
  • Release 1.0 of MAXQ Hierarchical Reinforcement Learning code.
  • RSW (Recurrent Sliding Window) Package for WEKA for sequential supervised learning.
  • Implementation of the PCBR region detector developed as part of the BugID project.
  • Implementation of TreeCRF system and supporting materials from our JMLR paper. Java implementation by Brad Block.
  • STONEFLY9 Image Database.
  • EPT29 Image Database.
  • Starcraft Scouting dataset (for UAI 2012 paper)

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  Professional Service, Journals, and Book Series

  • I am Past President of the Association for the Advancement of Artificial Intelligence.
  • I am a member of the Editorial Board for the Journal of Machine Learning Research, which is an electronic (and hardcopy) journal covering all areas of machine learning.
  • I am the moderator for the machine learning (CS.LG) part of CoRR, which is the computer science sub-part of arXiv.
  • I am past President of the International Machine Learning Society. I currently serve on the IMLS Board.

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  Entrepreneurial Activities

  • I am a co-founder of Strands (formerly MyStrands; formerly MusicStrands), a recommendation company.
  • I am a co-founder of Smart Desktop. Smart Desktop is now part of Decho, Inc., which is a "cloud computing" effort of EMC. Decho was a spinout of the TaskTracer project.
  • I am a co-founder and Chief Scientist of BigML. The goal of this startup is to develop large scale cloud-based machine learning services.

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  Current Students and Staff

  • Andrew Emmott, Graduate Student.
  • Risheek Garrepalli, Graduate Student (Jointly supervised with Alan Fern).
  • Jed Irvine, Senior Faculty Research Assistant (Software Engineer).
  • Michael Lam, Graduate Student (jointly advised with Sinisa Todorovic).
  • Si Liu, Graduate Student (jointly advised with Debashis Mondal, Statistics).
  • Sean McGregor, Graduate Student.
  • Michael Slater, Graduate Student (On leave from Faculty Research Assistant).
  • Pat Sullivan, Assistant and Grants Coordinator.
  • Tadesse Zemicheal, Graduate Student.

  Former Students and Staff

  • Majid Alkaee Taleghan. Machine Learning Scientist at Context Relevant.
  • Hussein Almuallim, Oil and Energy Professional, Calgary, Canada.
  • Eric Altendorf, Google.
  • Adam Ashenfelter, BigML, Inc., Corvallis, Oregon.
  • Ghulum Bakiri, President at MicroCenter, Bahrain.
  • Christian Baumberger. Software Engineer at Zuehlke Group
  • Xinlong Bao. Google Pittsburgh.
  • Brian Breck.
  • Waranun Bunjongsat.
  • Giuseppe Cerbone. Independent Information Services Professional, Milan, Italy.
  • Martha Chamberlin.
  • Hei Chan. Assistant Professor / Project Researcher at the Transdisciplinary Research Integration Center, UCLA.
  • Richard Charon.
  • Eric Chown, Full Professor, Bowdoin College.
  • Selina Chu, JPL, Pasadena, CA.
  • Dan Corpron
  • Mark Crowley, Assistant Professor, Department of Electrical and Computer Engineering, University of Waterloo.
  • Diane Damon, Damon Consulting, Portland, OR.
  • Ethan Dereszynski, Research Scientist, WebTrends, Portland, OR.
  • Phuoc Do, Vida Lab.
  • Nicholas Flann Associate Professor, Utah State University
  • Greg Foltz.
  • Dan Forrest.
  • Tony Fountain, Director of the Cyberinfrastructure Lab for Environmental Observing Systems (CLEOS), UC San Diego.
  • Ashit Gandhi, Founder and Vice-President, Prism Gem, LLC - The Art of Diamond Coloring.
  • Colin Gerety, Fort Collins, CO.
  • Brandon Harvey, Symantec and Linn-Benton Community College.
  • Arwen Griffioen.
  • Guohua Hao, Senior Data Scientist at iHeartRadio.
  • Hermann Hild, President, SMI Cognitive Software GmbH .
  • Jesse Hostetler
  • Rebecca Hutchinson, Assistant Professor of Computer Science and Fishers and Wildlife.
  • Saket Joshi, Member of Technical Staff at Cycorp.
  • Varad Joshi, Director of Engineering at Elemental Technologies.
  • Caroline Koff, Hewlett-Packard Corporation, Fort Collins, CO.
  • Victoria Keiser, Research Programmer, CMU. Masters Thesis (PDF).
  • Michael Kelm, Research Scientist, Siemens Healthcare.
  • Eun Bae Kong, Professor, Computer Science, Chungnam National University, South Korea
  • Bill Langford, Research Associate at RMIT, Melbourne, Australia.
  • Junyuan Lin, VMWare, Seattle.
  • Liping Liu, Postdoc with David Blei, Columbia University.
  • Dragos Margineantu, The Boeing Company.
  • Gonzalo Martinez, Assistant Professor, Autonomous University of Madrid.
  • Prafulla Mishra, Software Development Manager at eBay.
  • Avis Ng.
  • Soumya Ray, Assistant Professor, Case-Western Reserve University.
  • Angelo Restificar, Principal Machine Learning Engineer, EBay, Seattle.
  • Ritchey Ruff, Senior SDET, Microsoft.
  • Dan Sheldon, Assistant Professor, University of Massachusetts, Amherst.
  • Jianqiang Shen. Research Scientist, PARC. Doctoral dissertation.
  • Rongkun Shen. Post-doc, Oregon Health and Science University, Portland.
  • Michael Shindler, Lecturer at the University of Southern California
  • Shriprakash Sinha. Ph.D. student TU Delft.
  • Shahed Sorower, Scientist at Philips Research North America (Cambridge, MA.)
  • Simone Stumpf. Senior Lecturer, City University London.
  • Tao Sun, Graduate Student at UMass Amherst.
  • Dan Vega, Senior Software Engineer at Valley Inception, LLC.
  • Mark Vulfson. Microsoft Corporation.
  • Kiri Wagstaff, Principle Researcher at JPL.
  • Xin Wang, Senior Scientist at Inome (Intelius).
  • Dietrich Wettschereck. Consultant, Cologne, Germany.
  • Pengcheng Wu.
  • Michael Wynkoop, Qualcomm.
  • Qing Yao, College of Informatics and Electronics. Zhejiang Sci-Tech University. Hangzhou, China.
  • Wei Zhang, The Boeing Company.
  • Wei Zhang. Senior Software Engineer, Google. Doctoral Dissertation (PDF).
  • Valentina Zubek, Principal Statistician, Boehringer Ingelheim.

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  Previous Courses and Courseware

  • CS519/GEO599: Principles of Ecosystem Informatics, 2004-2005.
  • CS 534, Spring 2005, Machine Learning.
  • CS430, Fall 2003, Introduction to Artificial Intelligence
  • CS539, Fall 2003, Seminar: Probabilistic Relational Models
  • CS 533, Applied Artificial Intelligence for Engineeers.
  • CS 539, Winter 2000, Selected Topics in Artificial Intelligence: Probabilistic Agents
  • CS 430/530, Fall 1999, Artificial Intelligence Programming Techniques.
  • CS 519, Fall 1996. Research Methods in Computer Science.
  • CS 450/550, Winter 1996, Introduction to Computer Graphics.

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  Machine Learning Resources

  • ML-News is an email list operated by the IMLS for conference annoouncements, job positions (including graduate student and postdoc offers), and other items of relevance to the machine learning community. To join, you must have a google account. Log in to google and then go to the ML-News main page and click on "Apply to join group". Please include your affiliation in your join request.
  • How to be a Graduate Student. A great web page with pointers to lots of good resources for graduate students.
  • Standard Proofreading Symbols that I use when marking corrections on papers.
  • Computing Research Repository (part of arXiv). I am the moderator for machine learning.
  • Research Index at Penn State. An invaluable resource for finding online articles, citations, etc.
  • Journal of Machine Learning Research (JMLR). (Free electronic and hardcopy journal.)
  • Machine Learning. (Expensive hardcopy journal.)
  • Journal of Artificial Intelligence Research (JAIR). (Free electronic and hardcopy journal.)
  • The Machine Learning Database Repository at UC Irvine.
  • StatLib containing data, algorithms, and other information relevant to statistics.
  • Knowledge Discovery Mine containing information about knowledge discovery in databases.
  • NIPS Online Proceedings.
  • CMU Reinforcement learning group.
  • Bibliographies on Artificial Intelligence
  • The DBLP Computer Science Bibliography.
  • Numerical Recipes Homepage.

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  My Family's Musical Activities

  • yOya on MySpace and yOya home page. My son Noah writes songs and plays keyboards for this band.

  • Jubilate: The Women's Choir of Corvallis. My wife Carol sings in this choir.

  Tom Dietterich, tgd@cs.orst.edu