I need to write a PFA for an Rstudio code that I wrote. The Rstudio code does not contain any classic machine learning algorithms like trees or NNs. I wrote own functions for noise removals and other calculations. How do I write the PFA for this code? Please share any examples that you may have. I already have 'aurelius' installed. The examples that I found are all for classic machine learning algorithms like trees, or Neurals (https://stevenmortimer.com/pfa-with-the-r-package-aurelius/) and they can be converted to a PFA using the pfa() function easily (e.g. pfa(randomForest_model, pred_type='prob').