The rsample package provides functions to create different types of resamples and corresponding classes for their analysis. The goal is to have a modular set of methods that can be used for:
- resampling for estimating the sampling distribution of a statistic
- estimating model performance using a holdout set
The scope of rsample is to provide the basic building blocks for creating and analyzing resamples of a data set, but this package does not include code for modeling or calculating statistics. The Working with Resample Sets vignette gives a demonstration of how rsample tools can be used when building models.
Note that resampled data sets created by rsample are directly accessible in a resampling object but do not contain much overhead in memory. Since the original data is not modified, R does not make an automatic copy.
For example, creating 50 bootstraps of a data set does not create an object that is 50-fold larger in memory:
library(rsample) library(mlbench) data(LetterRecognition) lobstr::obj_size(LetterRecognition) #> 2,644,640 B set.seed(35222) boots <- bootstraps(LetterRecognition, times = 50) lobstr::obj_size(boots) #> 6,686,776 B # Object size per resample lobstr::obj_size(boots)/nrow(boots) #> 133,735.5 B # Fold increase is <<< 50 as.numeric(lobstr::obj_size(boots)/lobstr::obj_size(LetterRecognition)) #>  2.528426
Created on 2022-02-28 by the reprex package (v2.0.1)
The memory usage for 50 bootstrap samples is less than 3-fold more than the original data set.
To install it, use:
And the development version from GitHub with:
# install.packages("devtools") install_dev("rsample")
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