Mauro Maggioni, Research Professor
I am interested in novel constructions inspired by classical harmonic analysis that allow to analyse the geometry of manifolds and graphs and functions on such structures. These constructions are motivated by several important applications across many fields. In many situations we are confronted with large amounts of apparently unstructured highdimensional data. I find fascinating to study the intrinsic geometry of such data, and exploiting in order to study, explore, visualize, characterize statistical properties of the data. Oftentimes such data is modeled as a manifold (or something "close to a manifold") or a graph, and functions on these spaces need to approximated or "learned" from the data and experiments on the data. For example each data point could be a document, a graph associated with the documents could be given by for example hyperlinks, or by similarity of word frequencies, and a function on the set of documents would be how interesting I personally score a document. One may wish to learn how to predict how much I would score documents I have not seen yet. This can be cast as an approximation problem on the graph of documents, and it turns out that one can generalize Euclideantype approximation techniques (in particular multiscale regression techniques) to tackle this problem. An application of the above techniques that I find particularly interesting is Markov Decision Processes and Reinforcement Learning, where the problem of learning a behaviour from experience is cast in a rather general optimization and learning framework that involves approximations of functions and operators on graphs and manifolds. I am also interested in imaging, in particular I am working on novel classes of nonlinear denoising algorithms, based on diffusion processes on graphs of features built from images. Another interest is in the geometry of multiscale dynamical systems, and the construction of algorithms for the empirical construction of approximate equations for such systems. I also work on hyperspectral imaging, in particular in building automatic classifiers for discriminating normal from cancerous biopsies, for automated diagnostics and pathology.  Contact Info:
 Education:
Ph.D.  Washington University  2002 
M.S.  Washington University  2000 
Laurea in Matematica  Universita' degli Studi di Milano, Italy  1999 
 Specialties:

Applied Math
Analysis Probability
 Research Interests: Harmonic analysis, with applications to statistical analysis of highdimensional data, machine learning, imaging.
Current projects:
Multiscale analysis on graphs and manifolds, Nonlinear image denoising, Compressed imaging and hyperspectral imaging, Supervised and semisupervised learning on manifolds and graphs, Universal mappings via the eigenfunctions of the Laplacian, Perturbation of eigenfunctions of the Laplacian on graphs, Multiscale manifolds methods for Markov Decision Processes
I am interested in novel constructions inspired by classical harmonic analysis that allow to analyse the geometry of manifolds and graphs and functions on such structures. These constructions are motivated by several important applications across many fields. In many situations we are confronted with large amounts of apparently unstructured highdimensional data. I find fascinating to study the intrinsic geometry of such data, and exploiting in order to study, explore, visualize, characterize statistical properties of the data. Oftentimes such data is modeled as a manifold (or something "close to a manifold") or a graph, and functions on these spaces need to approximated or "learned" from the data and experiments on the data. For example each data point could be a document, a graph associated with the documents could be given by for example hyperlinks, or by similarity of word frequencies, and a function on the set of documents would be how interesting I personally score a document. One may wish to learn how to predict how much I would score documents I have not seen yet. This can be cast as an approximation problem on the graph of documents, and it turns out that one can generalize Euclideantype approximation techniques (in particular multiscale regression techniques) to tackle this problem. An application of the above techniques that I find particularly interesting is Markov Decision Processes and Reinforcement Learning, where the problem of learning a behaviour from experience is cast in a rather general optimization and learning framework that involves approximations of functions and operators on graphs and manifolds. I am also interested in imaging, in particular I am working on novel classes of nonlinear denoising algorithms, based on diffusion processes on graphs of features built from images. Another interest is in the geometry of multiscale dynamical systems, and the construction of algorithms for the empirical construction of approximate equations for such systems. I also work on hyperspectral imaging, in particular in building automatic classifiers for discriminating normal from cancerous biopsies, for automated diagnostics and pathology.
 Areas of Interest:
Harmonic analysis Multiscale analysis Markov decision processes Machine learning Highdimensional data analysis Stochastic dynamical systems Signal processing Imaging (e.g. hyperspectral) Geometric measure theory
 Keywords:
Algorithms • Amino Acids, BranchedChain • Animals • Anxiety • Base Sequence • Behavior, Animal • Brain • Chemistry, Physical • Chromosome Mapping • Diet • Diet, HighFat • Dietary Sucrose • Diffusion • Exploratory Behavior • Face • Harmonic • Hyperspectral • Imaging • Imaging, ThreeDimensional • Kinetics • Kynurenic Acid • Laplacian • Male • Models, Neurological • Models, Theoretical • Molecular Conformation • Molecular Dynamics Simulation • Mood Disorders • Multiscale • Multiscale Dynamical systems • Nanopores • Neural Networks (Computer) • Neurons • Obesity • Polymers • Rats • Rats, Wistar • Serotonin • Spectral graph theory • Thermodynamics • Time Factors • Tryptophan • Weight Gain
 Curriculum Vitae
 Current Ph.D. Students
(Former Students)
 Postdocs Mentored
 James Murphy (2015/12present)
 Stefano Vigogna (January, 2015  present)
 Wenjing Liao (August, 2013  present)
 David Lawlor (2012  2015)
 Joshua Vogelstein (2012  2014)
 Samuel Gerber (2012  2015)
 Grace Yi Wang (September, 2012  present)
 Nate Strawn (2011  2014)
 Mark Iwen (2010  2013)
 Guangliang Chen (2009  2012)
 Jake Bouvrie (2009  2012)
 YoonMo Jung (2007  2009)
 Undergraduate Research Supervised
 Jason Lee (May, 2009  May, 2010)
 Representative Publications
(More Publications)
 Allard, WK; Chen, G; Maggioni, M, Multiscale Geometric Methods for Data Sets II: Geometric Wavelets,
CoRR, vol. abs/1105.4924 no. 3
(2012)
 Iwen, MA; Maggioni, M, Approximation of Points on LowDimensional Manifolds Via Random Linear
Projections, vol. 2
(February, 2013) [1204.3337v1], [doi] [abs]
 M. Maggioni, Geometric Estimation of Probability Measures in HighDimensions,
Proc. IEEE Asilomar Conference
(November, 2013)
 Gerber, S; Maggioni, M, Multiscale dictionaries, transforms, and learning in highdimensions,
Proceedings of SPIE  The International Society for Optical Engineering, vol. 8858
(2013), ISSN 0277786X [Gateway.cgi], [doi]
 Maggioni, M; Davis, GL; Warner, FJ; Geshwind, FB; Coppi, AC; DeVerse, RA; Coifman, RR, Hyperspectral microscopic analysis of normal, benign and carcinoma microarray tissue sections, edited by Robert R. Alfano and Alvin Katz,
Proceedings of SPIE, vol. 6091 no. 1
(2006),
pp. 60910I, SPIE, ISSN 16057422 [1], [doi] [abs]
 Coifman, RR; Maggioni, M, Diffusion wavelets,
Applied and Computational Harmonic Analysis, vol. 21 no. 1
(2006),
pp. 5394, ISSN 10635203 [doi] [abs]
 Bouvrie, J; Maggioni, M, Efficient solution of Markov decision problems with multiscale representations,
2012 50th Annual Allerton Conference on Communication, Control, and Computing, Allerton 2012
(2012),
pp. 474481 [doi] [abs]
 Sridhar Mahadevan and Mauro Maggioni, Protovalue Functions: A Spectral Framework for Solving Markov Decision Processes,
submitted
(2006)
 Bouvrie, JV; Maggioni, M, Geometric multiscale reduction for autonomous and controlled nonlinear systems.,
in Proc. IEEE Conference on Decision and Control (CDC),
CDC
(2012),
pp. 43204327, IEEE, ISBN 9781467320658 [mostRecentIssue.jsp], [doi]
 Mauro Maggioni and Sridhar Mahadevan, Multiscale Diffusion Bases for Policy Iteration in Markov Decision Processes,
submitted
(Submitted, 2006)
 G. Chen, A.V. Little, M. Maggioni, L. Rosasco, Some recent advances in multiscale geometric analysis of point clouds,
in Wavelets and Multiscale Analysis: Theory and Applications
(March, 2011), Springer
 G. Chen, M. Maggioni, Multiscale Analysis of Plane Arrangements,
in Proc. C.V.P.R.
(2011)
 Rohrdanz, MA; Zheng, W; Maggioni, M; Clementi, C, Determination of reaction coordinates via locally scaled diffusion map.,
Journal of Chemical Physics, vol. 134 no. 12
(2011),
pp. 124116 [21456654], [doi] [abs]
 G. Chen, M. Maggioni, Multiscale Geometric Dictionaries for pointcloud data,
Proc. SampTA 2011
(2011)
 Zheng, W; Rohrdanz, MA; Maggioni, M; Clementi, C, Polymer reversal rate calculated via locally scaled diffusion map.,
Journal of Chemical Physics, vol. 134 no. 14
(2011),
pp. 144109 [21495744], [doi] [abs]
 Chen, G; Maggioni, M, Multiscale geometric wavelets for the analysis of point clouds,
2010 44th Annual Conference on Information Sciences and Systems, CISS 2010
(February, 2010) [doi] [abs]
 Jones, PW; Maggioni, M; Schul, R, Universal local parametrizations via heat kernels and eigenfunctions of the laplacian,
Annales Academiae Scientiarum Fennicae Mathematica, vol. 35 no. 1
(January, 2010),
pp. 131174, ISSN 1239629X [0709.1975v4], [doi] [abs]
 J. Lee, M. Maggioni, Multiscale Analysis of Time Series of Graphs,
Proc. SampTA 2011
(2010)
 Jones, PW; Maggioni, M; Schul, R, Manifold parametrizations by eigenfunctions of the Laplacian and heat kernels.,
Proceedings of the National Academy of Sciences of USA, vol. 105 no. 6
(2008),
pp. 18031808 [18258744], [doi] [abs]
 Coifman, RR; Lafon, S; Kevrekidis, IG; Maggioni, M; Nadler, B, Diffusion maps, reduction coordinates, and low dimensional representation of stochastic systems,
Multiscale Modeling & Simulation, vol. 7 no. 2
(2008),
pp. 842864, ISSN 15403459 [doi] [abs]
 Mahadevan, S; Maggioni, M, Protovalue Functions: A Laplacian Framework for Learning Representation and Control,
Journ. Mach. Learn. Res. no. 8
(September, 2007)
 G. Chen, A.V. Little, M. Maggioni, MultiResolution Geometric Analysis for Data in High Dimensions,
in Excursions in Harmonic Analysis, vol. 1
(2013), Birkhaüser Boston, ISBN 9780817683757 [doi]
 Mahadevan, S; Maggioni, M, Value function approximation with diffusion wavelets and Laplacian eigenfunctions,
in University of Massachusetts, Department of Computer Science Technical Report TR200538; Proc. NIPS 2005,
Advances in Neural Information Processing Systems
(2005),
pp. 843850, ISSN 10495258 [abs]
 Katz, NH; Krop, E; Maggioni, M, On the box problem,
Math. Research Letters, vol. 4
(2002),
pp. 515519
 Coifman, RR; Lafon, S; Lee, AB; Maggioni, M; Nadler, B; Warner, F; Zucker, SW, Geometric diffusions as a tool for harmonic analysis and structure definition of data: multiscale methods.,
Proceedings of the National Academy of Sciences of USA, vol. 102 no. 21
(May, 2005),
pp. 74327437, ISSN 00278424 [15899969], [doi] [abs]
 Coifman, RR; Lafon, S; Lee, AB; Maggioni, M; Nadler, B; Warner, F; Zucker, SW, Geometric diffusions as a tool for harmonic analysis and structure definition of data: diffusion maps.,
Proceedings of the National Academy of Sciences of USA, vol. 102 no. 21
(May, 2005),
pp. 74267431, ISSN 00278424 [15899970], [doi] [abs]
 J. Bouvrie, M. Maggioni, Multiscale Markov Decision Problems: Compression, Solution, and Transfer Learning
(Submitted, 2012) [1212.1143]
 Recent Grant Support
 Dimension Reduction for Open Quantum Systems, Stanford University, 2016/042020/03.
 BIGDATA:Collaborative Research:F:From Data Geometries to Information Networks, National Science Foundation, 1546392, 2016/012019/12.
 Statistical learning for highdimensional stochastic dynamical systems, National Science Foundation, 1522651, 2015/092018/08.
 Collaborative Research: SI2CHEExTASY Extensible Tools for Advanced Sampling and AnalYsis, National Science Foundation, CHE1265920, 2013/092017/08.
 ATD: Online Multiscale Algorithms for Geometric Density Estimation in HighDimensions and Persistent Homology of Data fo, National Science Foundation, DMS1222567, 2012/092017/08.
 ATD: Online Multiscale Algorithms for Geometric Density Estimation in HighDimensions and Persistent Homology of Data fo, National Science Foundation, DMS1222567, 2012/092017/08.
 Structured Dictionary Models and Learning for High Resolution Images, National Science Foundation, DMS1320655, 2013/082017/07.
 EMSW21RTG: Geometric, Topological, National Science Foundation, 2011/082017/07.
 Information, Approximation, and Fast Algorithms for Data in High Dimensions, Air Force Office of Scientific Research, 2013/122016/12.
 Geometric Approximation and Estimation of Probability Measures in High Dimensions, Air Force Office of Scientific Research, FA95501410033, 2013/122016/12.
 Multiscale Analysis of Dynamic Graphs, Office of Naval Research, N00014121060101, 2012/082016/07.
 Multiscale Analysis of Dynamic Graphs, Office of Naval Research, N00014121060101, 2012/082016/07.
 XRay Scatter and Phase Imaging for Explosive Detection, US Department of Homeland Security, HSHQDC11C00083, 2011/092015/09.
 Conferences Organized
 SAMSIFODAVA Workshop on Interactive Visualization and Analysis of Massive Data. December 10, 2012, SAMSIFODAVA Workshop on Interactive Visualization and Analysis of Massive Data, December 10, 2012
 Symposium of Knowledge Extraction at A.M.S. nat. meeing 2010. January 13, 2010, Symposium of Knowledge Extraction at A.M.S. nat. meeing 2010, January 13, 2010
 Large Data Workshop, C.T.M.S., Duke. November 13, 2009, Large Data Workshop, C.T.M.S., Duke, November 13, 2009
 A.A.A.I. workshop on manifold learning. November 5, 2009, A.A.A.I. workshop on manifold learning, November 5, 2009
 Organizer : Internet MultiResolution Analysis: Foundations, Applications and Practice. September 2008  December 2008, Organizer : Internet MultiResolution Analysis: Foundations, Applications and Practice, September, 2008  December, 2008
 Workshop on Eigenfunctions of the Laplacian, ICIAM 2007, July 18, 2007
 Document Space, Organizer, January, 2006
