pdp is an R package for constructing partial dependence plots (PDPs) and individual conditional expectation (ICE) curves. PDPs and ICE curves are part of a larger framework referred to as interpretable machine learning (IML), which also includes (but not limited to) variable importance plots (VIPs). While VIPs (available in the R package vip) help visualize feature impact (either locally or globally), PDPs and ICE curves help visualize feature effects. An in-progress, but comprehensive, overview of IML can be found at the following URL: https://github.com/christophM/interpretable-ml-book.

A detailed introduction to pdp has been published in The R Journal: “pdp: An R Package for Constructing Partial Dependence Plots”, https://journal.r-project.org/archive/2017/RJ-2017-016/index.html. You can track development at https://github.com/bgreenwell/pdp. To report bugs or issues, contact the main author directly or submit them to https://github.com/bgreenwell/pdp/issues. For additional documentation and examples, visit the package website.

As of right now, pdp exports four functions:

  • partial() - compute partial dependence functions and individual conditional expectations (i.e., objects of class "partial" and "ice", respectively) from various fitted model objects;

  • plotPartial()" - construct lattice-based PDPs and ICE curves;

  • autoplot() - construct ggplot2-based PDPs and ICE curves;

  • topPredictors() extract most “important” predictors from various types of fitted models. (Will soon be replaced by functionality from vip.)