GART

Guided Adversarial Robust Transfer (GART) Learning aims to effectively bridges the realms of transfer learning and distributional robustness prediction models when dealing with a limited amount of target data and a diverse range of source models. By leveraging the source mixing assumption, GART is designed to learn valuable knowledge that may be present in different yet potentially related auxiliary samples, and achieve a faster convergence rate than the model fitted with the target data.

Installation

You can install the development version of GART from GitHub with:

# install.packages("devtools")
devtools::install_github("xinxiong0238/GART")

Example

The following is a basic example to run GART. We first generate the training data (a small number of target data and 4 large but heterogenerous source data) as well as a validation data set. For illustration purpose, the validation data share the same generation mechanism as the training target data. Then GART function is called to estimate GART parameter and validate model performance. Five benchmarks are also included (i.e., target only estimator, source mixture, maximin, transLasso and transGLM).

library(GART)
data_sim = simu_data()
data = data_sim$GART_est_input
data_valid = data_sim$GART_eval_input

fit = GART(data, is_benchmark = T, is_valid = T, data_valid = data_valid)
#> Estimate source coef...
#> Estimate GART coef...
#> Add benchmark methods (maximin, transLasso, transGLM, etc)...
#> Valid model performance..