wvim_design_matrix: Create Feature Selection Design Matrix

In xplainfi: Feature Importance Methods for Global Explanations

Create Feature Selection Design Matrix

Description

Creates a logical design matrix for leave-in or leave-out feature evaluation. Used internally with mlr3fselect to evaluate feature subsets.

Usage

wvim_design_matrix(
  all_features,
  feature_names = all_features,
  direction = c("leave-out", "leave-in")
)

Arguments

all_features	(character()) All available feature names from the task.
feature_names	(character() | list of character()) Features or feature groups to evaluate. Can be a vector for individual features or a named list for grouped features. Defaults to all_features if unspecified.
direction	(character(1)) Either "leave-in" or "leave-out" (default). Controls which features are selected in the design matrix. "leave-out" sets features of interest to FALSE, and "leave-in" analogously sets them to TRUE.

Value

data.table with logical columns for each feature in all_features and length(feature_names) rows, one for each entry in feature_names

Examples

task = mlr3::tsk("mtcars")

# Individual features
feature_names = task$feature_names[1:3]
wvim_design_matrix(task$feature_names, feature_names, "leave-in")
wvim_design_matrix(task$feature_names, feature_names, "leave-out")

# Feature groups
feature_groups = list(
  A = task$feature_names[1:2],
  B = task$feature_names[3:5]
)
wvim_design_matrix(task$feature_names, feature_groups, "leave-out")

xplainfi documentation built on Feb. 27, 2026, 1:08 a.m.