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#' Set advanced options for RunHarmony
#' @param lambda_range Default lambda_range = c(0.1, 10). Lambda is ridge
#' regression penalty parameter and smaller values result in more
#' aggressive correction. During harmony iterations, the appropriate value
#' of lambda is dynamically estimated. And parameter `lambda_range` set the
#' allowed range for lambda estimation. e.g. `lambda_range` = c(0.1, 10)
#' means that lambda can only vary between 0.1 and 10 when being
#' dynamically estimated. Note that when setting the upper and lower bound
#' of lambda_range to the same value would result in using a fixed lambda
#' throughout harmony iterations. e.g. `lambda_range` = c(1,1) would make
#' harmony using a fixed lambda = 1.
#' @param tau Protection against overclustering small datasets with
#' large ones. `tau` is the expected number of cells per cluster.
#' @param block.size What proportion of cells to update during clustering.
#' Between 0 to 1, default 0.05. Larger values may be faster but less
#' accurate.
#' @param max.iter.cluster Maximum number of rounds to run clustering
#' at each round of Harmony.
#' @param epsilon.cluster Convergence tolerance for clustering round
#' of Harmony. Set to -Inf to never stop early.
#' @param epsilon.harmony Convergence tolerance for Harmony. Set to -Inf to
#' never stop early. When `epsilon.harmony` is set to not NULL, then
#' user-supplied values of `early_stop` is ignored.
#' @returns Return a list for `.options` argument of `RunHarmony`
#' @export
#' @examples
#' ## If want to set lambda to be fixed to 1, do
#' \dontrun{
#' RunHarmony(data_meta, meta_data, vars_use,
#' .options = harmony_options(lambda = c(1, 1)))
#' }
#'
harmony_options <- function(
lambda_range = c(0.1, 10),
tau = 0,
block.size = 0.05,
max.iter.cluster = 20,
epsilon.cluster = 1e-5,
epsilon.harmony = 1e-4) {
lambda_range <- validate_lambda_range(lambda_range)
block.size <- validate_block.size(block.size)
out <- list(
lambda_range = lambda_range,
tau = tau,
block.size = block.size,
max.iter.cluster = max.iter.cluster,
epsilon.cluster = epsilon.cluster,
epsilon.harmony = epsilon.harmony
)
out <- structure(out, class = "harmony_options")
return(out)
}
## Validate functions -----------------------------------------------------------
validate_lambda_range <- function(lambda_range) {
if (length(lambda_range) != 2) {
stop('Error: lambda_range should have length == 2')
}
if (lambda_range[2] < lambda_range[1]) {
stop('Error: lambda_range[2] cannot be smaller than lambda_range[1]')
}
if (lambda_range[1] <= 0) {
stop('Error: lambda_range cannot be smaller or equal to 0')
}
if (lambda_range[2] == lambda_range[1]) {
message("Automatic lambda estimation for ridge is disabled. Harmony will have a fixed lambda for all batches")
}
return(lambda_range)
}
validate_block.size <- function(block.size) {
if(block.size <= 0 | block.size > 1){
stop('Error: block.size should be set between 0 and 1 (0 < block.size <= 1)')
}
return(block.size)
}
#' @importFrom methods hasArg
check_legacy_args <- function(...) {
if (hasArg("do_pca") || hasArg("npcs")) legacy_warning("do_pca_npcs")
if (hasArg("tau")) legacy_warning("tau")
if (hasArg("block.size")) legacy_warning("block.size")
if (hasArg("max.iter.harmony")) legacy_warning("max.iter.harmony")
if (hasArg("max.iter.cluster")) legacy_warning("max.iter.cluster")
if (hasArg("epsilon.cluster")) legacy_warning("epsilon.cluster")
if (hasArg("epsilon.harmony")) legacy_warning("epsilon.harmony")
}
legacy_warning <- function(param) {
common_warn <- paste0(
"Warning: The parameter ", param, " is deprecated. ",
"It will be ignored for this function call ",
"and please remove parameter ", param, " in future function calls. ",
"Advanced users can set value of parameter ", param,
" by using parameter .options and function harmony_options()."
)
do_pca_npcs_warn <- paste0(
"Warning: The parameters ", "do_pca and npcs", " are deprecated. ",
"They will be ignored for this function call ",
"and please remove parameters ", "do_pca and npcs",
" and pass to harmony cell_embeddings directly."
)
max.iter.harmony_warn <- paste0(
"Warning: The parameter ", "max.iter.harmony ",
"is replaced with parameter ", "max_iter. ",
"It will be ignored for this function call ",
"and please use parameter ", "max_iter ", "in future function calls."
)
epsilon.harmony_warn <- paste0(
"Warning: The parameter ", "epsilon.harmony", " is deprecated. ",
"It will be ignored for this function call ",
"and please remove parameter ", "epsilon.harmony",
" in future function calls. ",
"If users want to control if harmony would stop early or not, ",
"use parameter ", "early_stop. ",
"Advanced users can set value of parameter ", "epsilon.harmony",
" by using parameter .options and function harmony_options()."
)
if (param %in% c("tau", "block.size", "max.iter.cluster",
"epsilon.cluster")) {
warn_str <- common_warn
}
if (param == "do_pca_npcs") {
warn_str <- do_pca_npcs_warn
}
if (param == "max.iter.harmony") {
warn_str <- max.iter.harmony_warn
}
if (param == "epsilon.harmony") {
warn_str <- epsilon.harmony_warn
}
rlang::warn(warn_str, .frequency = "once", .frequency_id = param)
}
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