Deprecated subsampling function
msgl.subsampling(x, classes, sampleWeights = NULL, grouping = NULL,
groupWeights = NULL, parameterWeights = NULL, alpha = 0.5,
standardize = TRUE, lambda, d = 100, training, test,
intercept = TRUE, sparse.data = is(x, "sparseMatrix"),
collapse = FALSE, max.threads = NULL, use_parallel = FALSE,
algorithm.config = msgl.standard.config)