merge pr #141: stacks v1.0.0

DESCRIPTION

@@ -1,6 +1,6 @@
 Package: stacks
 Title: Tidy Model Stacking
-Version: 0.2.4.9000
+Version: 1.0.0
 Authors@R: c(
     person(given = "Simon",
            family = "Couch",

NEWS.md

@@ -1,8 +1,13 @@
-# stacks (development version)
+# stacks 1.0.0
 
-To be released as stacks 1.0.0.
+stacks 1.0.0 is the first production release of the package. While this release
+includes only a few minor bug fixes, it's accompanied by a white paper
+recently published in the Journal of Open Source software. You can read
+that paper [here](https://doi.org/10.21105/joss.04471)!
 
-* Addressed re-introduction of bug arising from outcome levels that are not 
+This release:
+
+* Addresses re-introduction of a bug arising from outcome levels that are not 
   valid column names in the multinomial classification setting (#133). 
 * Fixes bug where stacks will return incorrect predictions if an elastic net
   meta-learner is used, the `type` argument to `predict` is set to `"class"`, 

R/add_candidates.R

@@ -506,7 +506,8 @@ collate_predictions <- function(x) {
 
 # given a set of candidate columns, removes those with hard class predictions
 remove_class_preds <- function(x) {
-  lvls <- make.names(levels(factor(x[[1]])))
+  lvls <- make.names(paste0(".prefix.", levels(factor(x[[1]]))))
+  lvls <- gsub(".prefix.", "", lvls, fixed = TRUE)
 
   # gather indices for the columns with class probability predictions
   prob_preds_idx <- purrr::map(paste0(".pred_", lvls), grepl, x = colnames(x)) %>%