About functions "remove_highly_correlated_features"

[liyang75]

hello，my firend.Recently, I've been studying your featuretools package and I have a question for you. About functions "remove_highly_correlated_features"，The documentation says:"We make the assumption that, for a pair of features, the feature that is further right in the feature matrix produced by dfs is the more complex one". I want to know, In the dfs, How to calculate the complexity of the features and then sort them？ Why the features on the right are more complex？ Thanks