Expose "constructors" for rsample & rset objects

[ClaytonJY]

Lately I've been making splits and rsets in some non-standard ways for internal (work) packages. I've been getting along fine using new_rset/make_splits/rsplit, but there's always a little discomfort in depending on triple-colon hidden functions in another package.

Maybe this is already on the roadmap, but I would greatly appreciate exported functions for making custom objects from this package. I suspect you'll want to wait until you've solidified the API some more, but hopefully by making a note of it here you might consider @export-ing new_rset/make_splits when the time is right. Thanks!

[dougmet]

I've been using caret2rsample to achieve this without triple colons. Seeing as caret::trainControl just returns a list, so long as you have the right bits it seems to work.

I make a list called indices, which has two named lists: in_indices is a list which corresponds to index in trainControl. out_indices corresponds to indexOut. The names are the names of each resample.

indices_to_rsample <- function(indices, data, method = "cv", repeats = NA,
                               number = 10) {

  # in_indices and out_indices must be named with the same names
  ctrl <- list(index = indices$in_indices,
               indexOut = indices$out_indices,
               method = method,
               repeats = repeats,
               number = number)

  rsample::caret2rsample(ctrl, data)

}

Now this relies on the caret2rsample interface remaining constant so I'm hoping for a better way soon but it at least stops CMD check from crying.

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