Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Occurrence frequency of selected features across different folds of cross‐validation. The horizontal axis is the feature index, and the vertical axis is the occurrence frequency of a feature. (A). Supervised model. (B). Semi‐supervised model.
