Fig. 4
From: Topological data analysis and machine learning for COVID-19 detection in CT scan lung images
The flowchart for PHML modeling. It entails the selection of specific cubical complexes based on the data types in use. By tuning an appropriate filtration parameter, one can apply persistent homology (PH) analysis through custom software such as PHAT. The output generated by PH is then converted into feature vectors, which are subsequently integrated with supervised machine learning methods