Deliverable 3.2: Report on Discovering Structure within Dictionary Learning

In this work package (WP), we investigate the possibility of discovering structure within dictionary learning. This could range from exploring groups of atoms that appear in clusters - a form of molecule learning - to learning graphical dependencies across the dictionary elements. In modeling a signal as a sparse combination of atoms, ties between atoms can be enforced. For example harmonic models Gabor dictionaries can be seen as this type of model. Here we aim to explore the "molecule-learning" problem - learning clusters of tied atoms - by generalizing existing dictionary learning methods. Our aim is to show that with this added feature, models tend to be more reliable towards the signals represented.

    Keywords: LTS2 ; dictionary learning ; structured sparsity


    Deliverable 3.2 of the Sparse Models, Algorithms and Learning for Large-Scale Data (SMALL) project founded by the EU FP7 FET-Open program.


    • EPFL-REPORT-166978

    Record created on 2011-06-18, modified on 2017-05-10


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