| Paper ID | MLSP-35.2 |
| Paper Title |
ICA WITH ORTHOGONALITY CONSTRAINT: IDENTIFIABILITY AND A NEW EFFICIENT ALGORITHM |
| Authors |
Benjamin Gabrielson, Mohammad Akhonda, University of Maryland, Baltimore County, United States; Zois Boukouvalas, American University, United States; Seung Jun Kim, Tülay Adali, University of Maryland, Baltimore County, United States |
| Session | MLSP-35: Independent Component Analysis |
| Location | Gather.Town |
| Session Time: | Thursday, 10 June, 15:30 - 16:15 |
| Presentation Time: | Thursday, 10 June, 15:30 - 16:15 |
| Presentation |
Poster
|
| Topic |
Machine Learning for Signal Processing: [MLR-ICA] Independent component analysis |
| IEEE Xplore Open Preview |
Click here to view in IEEE Xplore |
| Virtual Presentation |
Click here to watch in the Virtual Conference |
| Abstract |
Given the prevalence of independent component analysis (ICA) for signal processing, many methods for improving the convergence properties of ICA have been introduced. The most utilized methods operate by iterative rotations over pre-whitened data, whereby limiting the space of estimated demixing matrices to those that are orthogonal. However, a proof of the identifiability conditions for orthogonal ICA methods has not yet been presented in the literature. In this paper, we derive the identifiability conditions, starting from the orthogonal ICA maximum likelihood cost function. We then review efficient optimization approaches for orthogonal ICA defined on the Lie group of orthogonal matrices. Afterwards, we derive a new efficient algorithm for orthogonal ICA, by defining a mapping onto a space of constrained matrices which we define as hyper skew-symmetric. Finally, we experimentally demonstrate the advantages of the new algorithm over the pre-existing Lie group methods. |
