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Driss Lahlou Kitane

dblp:314/2376 · DBLP profile ↗
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1ranked-venue papers
0as first author
1since 2021 · last 2023
—ORCID · none

Domains — the database's venue-derived domains; a paper can count in several

Artificial intelligence and machine learning · 1 · 1 since 2021

Expertise — from the expertise taxonomy: the topics of the expert's papers under the CCF categories. A weight counts papers with recency: 1 for a paper about the topic, 0.3 when the topic is its context, halved every five years.

Theoretical computer science
1 paper
Algorithms and data structures · 50% Mathematical optimization · 50%

Topics — the 2 heaviest of 2, each with the papers that count most for it

TopicWeightPapersLastEvidence papers
Mathematical optimization › integer programming › binary optimization
binary linear programming
0.712023
Sparse PCA: a Geometric Approach · J. Mach. Learn. Res. 2023
Algorithms and data structures › numerical linear algebra › dimensionality reduction › principal component analysis
sparse PCA
0.712023
Sparse PCA: a Geometric Approach · J. Mach. Learn. Res. 2023

Methods — techniques the papers use, named apart from their topics

eigenvalue decomposition · 0.7binary linear optimization · 0.7
YearPublicationVenuePosition
2023 Sparse PCA: a Geometric Approach
abstract
We consider the problem of maximizing the variance explained from a data matrix using orthogonal sparse principal components that have a support of fixed cardinality. While most existing methods focus on building principal components (PCs) iteratively through deflation, we propose GeoSPCA, a novel algorithm to build all PCs at once while satisfying the orthogonality constraints which brings substantial benefits over deflation. This novel approach is based on the left eigenvalues of the covariance matrix which helps circumvent the non-convexity of the problem by approximating the optimal solution using a binary linear optimization problem that can find the optimal solution. The resulting approximation can be used to tackle different versions of the sparse PCA problem including the case in which the principal components share the same support or have disjoint supports and the Structured Sparse PCA problem. We also propose optimality bounds and illustrate the benefits of GeoSPCA in selected real world problems both in terms of explained variance, sparsity and tractability. Improvements vs. the greedy algorithm, which is often at par with state-of-the-art techniques, reaches up to 24% in terms of variance while solving real world problems with 10,000s of variables and support cardinality of 100s in minutes. We also apply GeoSPCA in a face recognition problem yielding more than 10% improvement vs. other PCA based technique such as structured sparse PCA.
Dimitris Bertsimas, Driss Lahlou Kitane
J. Mach. Learn. Res.2