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[R] remove uses of exists() (#6387)

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James Lamb 2020-11-17 07:06:23 +00:00 committed by GitHub
parent 3ac173fc8b
commit 3cca1c5fa1
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1 changed files with 3 additions and 5 deletions
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R-package/R/utils.R
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@ -191,9 +191,8 @@ xgb.iter.eval <- function(booster_handle, watchlist, iter, feval = NULL) {
generate.cv.folds <- function(nfold, nrows, stratified, label, params) {
# cannot do it for rank
if (exists('objective', where = params) &&
is.character(params$objective) &&
strtrim(params$objective, 5) == 'rank:') {
objective <- params$objective
if (is.character(objective) && strtrim(objective, 5) == 'rank:') {
stop("\n\tAutomatic generation of CV-folds is not implemented for ranking!\n",
"\tConsider providing pre-computed CV-folds through the 'folds=' parameter.\n")
}
@ -206,8 +205,7 @@ generate.cv.folds <- function(nfold, nrows, stratified, label, params) {
# - For classification, need to convert y labels to factor before making the folds,
# and then do stratification by factor levels.
# - For regression, leave y numeric and do stratification by quantiles.
if (exists('objective', where = params) &&
is.character(params$objective)) {
if (is.character(objective)) {
# If 'objective' provided in params, assume that y is a classification label
# unless objective is reg:squarederror
if (params$objective != 'reg:squarederror')