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feat: better error message when incorrectly configuring validation data #1268

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sebffischer merged 4 commits into from
Mar 24, 2025
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feat: better error message when incorrectly configuring validation data #1268

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caca1e4
feat: better error message when incorrectly configuring validation data
sebffischer Mar 21, 2025
5c57c0f
Merge branch 'main' into better-error-validation
sebffischer Mar 24, 2025
796e179
Update R/worker.R
sebffischer Mar 24, 2025
42db776
Update NEWS.md
sebffischer Mar 24, 2025
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4 changes: 3 additions & 1 deletion NEWS.md
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Original file line number Diff line number Diff line change
@@ -1,6 +1,8 @@
# mlr3 (development version)

* feat: Add `score_roc_measures()` to score a prediction on various roc measures.
* feat: A better error message is thrown, which often happens when incorrectly configuring the `validate` field
of a `GraphLearner`

# mlr3 0.23.0

Expand All @@ -13,7 +15,7 @@
* BREAKING CHANGE: `Learner$predict_types` is read-only now.
* docs: Clear up behavior of `Learner$predict_type` after training.
* feat: Add callbacks to `resample()` and `benchmark()`.
* fix: Internal tuning and validation now works when the model requires marshaling (#1256).
* fix: Internal tuning and validation now works when the model requires marshaling (#1256)

# mlr3 0.22.1

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2 changes: 1 addition & 1 deletion R/worker.R
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Expand Up @@ -515,7 +515,7 @@ create_internal_valid_task = function(validate, task, test_row_ids, prev_valid,
if (is.character(validate)) {
if (validate == "predefined") {
if (is.null(task$internal_valid_task)) {
stopf("Parameter 'validate' is set to 'predefined' but no internal validation task is present.")
stopf("Parameter 'validate' is set to 'predefined' but no internal validation task is present. This commonly happens in GraphLearners and can be avoided by configuring the validation data for the GraphLearner via `set_validate(<glrn>, validate = <value>)`. See https://mlr3book.mlr-org.com/chapters/chapter15/predsets_valid_inttune.html for more information.")
}
if (!identical(task$target_names, task$internal_valid_task$target_names)) {
stopf("Internal validation task '%s' has different target names than primary task '%s', did you modify the task after creating the internal validation task?",
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