R: Extract the feature selection results from a benchmark...

getBMRFeatSelResults {mlr} | R Documentation

## Extract the feature selection results from a benchmark result.

### Description

Returns a nested list of FeatSelResults. The first level of nesting is by data set, the second by learner, the third for the benchmark resampling iterations. If `as.df` is `TRUE`, a data frame with “task.id”, “learner.id”, the resample iteration and the selected features is returned.

Note that if more than one feature is selected and a data frame is requested, there will be multiple rows for the same dataset-learner-iteration; one for each selected feature.

### Usage

    getBMRFeatSelResults(bmr, task.ids = NULL, learner.ids = NULL,
      as.df = FALSE, drop = FALSE)

### Arguments

`bmr` | (BenchmarkResult) Benchmark result.
`task.ids` | (`character(1)`) Restrict result to certain tasks. Default is all.
`learner.ids` | (`character(1)`) Restrict result to certain learners. Default is all.
`as.df` | (`character(1)`) Return one data.frame as result - or a list of lists of objects?. Default is `FALSE`.
`drop` | (`logical(1)`) If drop is `FALSE` (the default), a nested list with the following structure is returned: `res[task.ids][learner.ids]`. If drop is set to `TRUE` it is checked if the list structure can be simplified. If only one learner was passed, a list with entries for each task is returned. If only one task was passed, the entries are named after the corresponding learner. For an experiment with both one task and learner, the whole list structure is removed. Note that the name of the task/learner will be dropped from the return object.

### Value

(list | data.frame). See above.

### See Also

Other benchmark: `BenchmarkResult`, `batchmark`, `benchmark`, `convertBMRToRankMatrix`, `friedmanPostHocTestBMR`, `friedmanTestBMR`, `generateCritDifferencesData`, `getBMRAggrPerformances`, `getBMRFilteredFeatures`, `getBMRLearnerIds`, `getBMRLearnerShortNames`, `getBMRLearners`, `getBMRMeasureIds`, `getBMRMeasures`, `getBMRModels`, `getBMRPerformances`, `getBMRPredictions`, `getBMRTaskDescs`, `getBMRTaskIds`, `getBMRTuneResults`, `plotBMRBoxplots`, `plotBMRRanksAsBarChart`, `plotBMRSummary`, `plotCritDifferences`, `reduceBatchmarkResults`

[Package mlr version 2.12.1 Index]