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Backup Benchmark Result Callback

Source: R/mlr_callbacks.R
mlr3fselect.backup.Rd

This CallbackBatchFSelect writes the mlr3::BenchmarkResult after each batch to disk. The path must be set, e.g. clbk("mlr3fselect.backup", path = "backup.rds"). The benchmark result is written to a temporary file first and then renamed, so that a crash while writing does not destroy the backup of the previous batch.

Examples

clbk("mlr3fselect.backup", path = "backup.rds")
#> <CallbackBatchFSelect:mlr3fselect.backup>: Backup Benchmark Result Callback
#> * Active Stages: on_optimizer_after_eval, on_optimization_begin

# Run feature selection on the Palmer Penguins data set
instance = fselect(
  fselector = fs("random_search"),
  task = tsk("diabetes"),
  learner = lrn("classif.rpart"),
  resampling = rsmp ("holdout"),
  measures = msr("classif.ce"),
  term_evals = 4,
  callbacks = clbk("mlr3fselect.backup", path = tempfile(fileext = ".rds")))