CODI: Enhancing machine learning-based molecular profiling through contextual out-of-distribution integration

Eissa, Tarek ; Huber, Marinus ; Obermayer-Pietsch, Barbara ; Linkohr, Birgit ; Peters, Annette ; Fleischmann, Frank; Žigman, Mihaela und Kavraki, Lydia (15. Oktober 2024): CODI: Enhancing machine learning-based molecular profiling through contextual out-of-distribution integration. In: PNAS Nexus, Bd. 3, Nr. 10, pgae449

Abstract

Molecular analytics increasingly utilize machine learning (ML) for predictive modeling based on data acquired through molecular profiling technologies. However, developing robust models that accurately capture physiological phenotypes is challenged by the dynamics inherent to biological systems, variability stemming from analytical procedures, and the resource-intensive nature of obtaining sufficiently representative datasets. Here, we propose and evaluate a new method: Contextual Out-of-Distribution Integration (CODI). Based on experimental observations, CODI generates synthetic data that integrate unrepresented sources of variation encountered in real-world applications into a given molecular fingerprint dataset. By augmenting a dataset with out-of-distribution variance, CODI enables an ML model to better generalize to samples beyond the seed training data, reducing the need for extensive experimental data collection. Using three independent longitudinal clinical studies and a case–control study, we demonstrate CODI’s application to several classification tasks involving vibrational spectroscopy of human blood. We showcase our approach’s ability to enable personalized fingerprinting for multiyear longitudinal molecular monitoring and enhance the robustness of trained ML models for improved disease detection. Our comparative analyses reveal that incorporating CODI into the classification workflow consistently leads to increased robustness against data variability and improved predictive accuracy.

• Dokumententyp: Zeitschriftenartikel
• Keywords: data augmentation ; molecular analytics ; machine learning ; variability modeling ; out-of-distribution
• Fakultät: Medizin ; Medizin > Institut für Medizinische Informationsverarbeitung, Biometrie und Epidemiologie
• Themengebiete: 600 Technik, Medizin, angewandte Wissenschaften > 610 Medizin und Gesundheit
• ISSN: 2752-6542
• Bemerkung: Advance access publication 15 October 2024
• Sprache: Englisch