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```
#' @title Control parameters for trained NBLDA model.
#'
#' @description Define control parameters to be used within \code{\link{trainNBLDA}} function.
#'
#' @param folds A positive integer. The number of folds for k-fold model validation.
#' @param repeats A positive integer. This is the number of repeats for k-fold model validation. If NULL, 0 or negative, it is set to 1.
#' @param foldIdx a list with indices of hold-out samples for each fold. It should be a list where folds are nested within repeats.
#' If NULL, \code{folds} and \code{repeats} are used to define hold-out samples.
#' @param rhos A vector of tuning parameters that control the amount of soft thresholding performed. If NULL, it is automatically generated within
#' \code{\link{trainNBLDA}} using \code{tuneLength}, i.e. the length of grid search. See details.
#' @param beta A smoothing term. A Gamma(beta,beta) prior is used to fit the Poisson model. Recommendation is to just leave it at 1, the default value.
#' See Witten (2011) and Dong et. al. (2016) for details.
#' @param prior A vector of length equal to the number of classes indicating the prior class probabilities. If NULL, all classes are assumed to be
#' equally distributed.
#' @param transform a logical. If TRUE, count data is transformed using power transformation. If \code{alpha} is not specified the power transformation
#' parameter is automatically calculated using goodness-of-fit test. See Witten (2011) for details.
#' @param alpha a numeric value within [0, 1] to be used for power transformation.
#' @param truephi a vector of length equal to the number of variables representing the true overdispersion parameters for each variable. If a single
#' value is given, it is replicated for all variables. If a vector of length unequal to the number of variables is given, the first element of this
#' vector is used and replicated for all variables. If NULL, estimated overdispersions are used in the classifier. See details.
#' @param target a value for the shrinkage target of dispersion estimates. If target is NULL, then then a value that is small and minimizes the
#' average squared difference is automatically used as the target value. See \code{\link[sSeq]{getT}} for details.
#' @param phi.epsilon a positive value for controlling the number of features whose dispersions are shrinked towards 0. See details.
#' @param normalize.target a logical. If TRUE and \code{target} is NULL, the target value is estimated using normalized dispersion estimates.
#' See \code{\link[sSeq]{getT}} for details.
#' @param delta a weight within the interval [0, 1] that is used while shrinking dispersions towards 0. When "delta = 0", initial dispersion estimates
#' are forced to be shrinked to 1. Similarly, if "delta = 0", no shrinkage is performed on initial estimates.
#' @param multicore a logical. If a parallel backend is loaded and available, the function runs in parallel CPUs.
#' @param ... further arguements passed to \code{\link{trainNBLDA}}.
#'
#' @return a list with all the control elements.
#'
#' @details \code{rhos} is used to control the level of sparsity, i.e. the number of variables (or features) used in classifier. If a variable has
#' no contribution to discrimination function, it should be removed from the model. By setting rhos within the interval [0, Inf], it is possible
#' control the amount of variables that is removed from the model. As the upper bound of rhos decreases towards 0, fewer variables are removed.
#' If rhos = 0, all variables are included in classifier.
#'
#' \code{truephi} controls how Poisson model differs from Negative Binomial model. If overdispersion is zero, Negative Binomial model converges to
#' Poisson model. Hence, the results from \code{\link{trainNBLDA}} is identical to PLDA results from \code{\link[PoiClaClu]{Classify}} when truephi = 0.
#'
#' \code{phi.epsilon} is a value used to shring estimated overdispersions towards 0. Poisson model assumes that there is no overdispersion in the
#' observed counts. However, this is not a valid assumption in highly overdispersed count data. \code{NBLDA} performs a shrinkage on estimated
#' overdispersions. Although the amount of shrinkage is dependent on several parameters such as \code{delta}, \code{target} and \code{truephi}, some
#' of the shrinked overdispersions might be very close to 0. By defining a threshold value for shrinked overdispersions, it is possible to shrink
#' very small overdispersions towards 0. If estimated overdispersion is below \code{phi.epsilon}, it is shrinked to 0. If \code{phi.epsilon} = NULL,
#' threshold value is set to 0. Hence, all the variables with very small overdispersion are included in the NBLDA model.
#'
#' @author Dincer Goksuluk
#'
#' @references Witten, DM (2011). Classification and clustering of sequencing data using a Poisson model.
#' Ann. Appl. Stat. 5(4), 2493--2518. doi:10.1214/11-AOAS493.
#'
#' Dong, K., Zhao, H., Tong, T., & Wan, X. (2016). NBLDA: negative binomial linear discriminant analysis for RNA-Seq data.
#' BMC Bioinformatics, 17(1), 369. http://doi.org/10.1186/s12859-016-1208-1.
#'
#' Yu, D., Huber, W., & Vitek, O. (2013). Shrinkage estimation of dispersion in Negative Binomial models
#' for RNA-seq experiments with small sample size. Bioinformatics, 29(10), 1275-1282.
#'
#' @seealso \code{\link[sSeq]{getT}}, \code{\link[sSeq]{getAdjustDisp}}
#'
#' @examples
#' nbldaControl() # return default control parameters.
#'
#' @name nbldaControl
#' @rdname nbldaControl
#'
#' @export
nbldaControl <- function(folds = 5, repeats = 2, foldIdx = NULL, rhos = NULL, beta = 1,
prior = NULL, transform = FALSE, alpha = NULL, truephi = NULL, target = 0,
phi.epsilon = 0.15, normalize.target = FALSE, delta = NULL, multicore = FALSE, ...){
if (is.null(foldIdx)){
if (repeats <= 0 | is.null(repeats)){
repeats <- 1
}
} else {
repeats <- length(foldIdx)
folds <- length(foldIdx[[1]])
}
list(folds = folds, repeats = repeats, foldIdx = foldIdx, rhos = rhos, phi.epsilon = phi.epsilon, beta = beta,
prior = prior, transform = transform, alpha = alpha, truephi = truephi,
target = target, normalize.target = normalize.target, delta = delta, multicore = multicore, ...)
}
```

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