List Tasks from OpenML

This function allows to find tasks on https://openml.org/t using some simple filter criteria.

Note that only a subset of filters is exposed here. For a more feature-complete package, see OpenML.

list_oml_tasks(
  task_id = NULL,
  number_instances = NULL,
  number_features = NULL,
  number_classes = NULL,
  number_missing_values = NULL,
  tag = NULL,
  limit = 5000L,
  ...
)

Arguments

task_id	(integer()) Vector of task ids to restrict to.
number_instances	(integer()) Filter for number of instances.
number_features	(integer()) Filter for number of features.
number_classes	(integer()) Filter for number of labels of the target (only classification tasks).
number_missing_values	(integer()) Filter for number of missing values.
tag	(character()) Filter for specific tag. You can provide multiple tags as character vector.
limit	(integer()) Limit the results to limit records. Default is 5000.
...	(any) Additional filters as named arguments.

Value

(data.table()) of results, or a Null data.table if no task matches the criteria.

Details

Filter values can be provided as single atomic values (typically integer or character). Provide a numeric vector of length 2 (c(l, u)) to find matches in the range \([l, u]\).

References

Casalicchio G, Bossek J, Lang M, Kirchhoff D, Kerschke P, Hofner B, Seibold H, Vanschoren J, Bischl B (2017). “OpenML: An R Package to Connect to the Machine Learning Platform OpenML.” Computational Statistics, 1--15. doi: 10.1007/s00180-017-0742-2 .

Vanschoren J, van Rijn JN, Bischl B, Torgo L (2014). “OpenML.” ACM SIGKDD Explorations Newsletter, 15(2), 49--60. doi: 10.1145/2641190.2641198 .

Examples

# \donttest{
list_oml_tasks(number_instances = 150, number_features = c(1, 10))
#>      task_id                 task_type data_id name status MajorityClassSize
#>   1:      59 Supervised Classification      61 iris active                50
#>   2:     118            Learning Curve      61 iris active                50
#>   3:     289 Supervised Classification      61 iris active                50
#>   4:    1758            Learning Curve      61 iris active                50
#>   5:    1823 Supervised Classification      61 iris active                50
#>  ---                                                                        
#> 489:  360927 Supervised Classification      61 iris active                50
#> 490:  360928 Supervised Classification      61 iris active                50
#> 491:  360929 Supervised Classification      61 iris active                50
#> 492:  360943                Clustering      61 iris active                50
#> 493:  360944                Clustering      61 iris active                50
#>      MaxNominalAttDistinctValues MinorityClassSize NumberOfClasses
#>   1:                           3                50               3
#>   2:                           3                50               3
#>   3:                           3                50               3
#>   4:                           3                50               3
#>   5:                           3                50               3
#>  ---                                                              
#> 489:                           3                50               3
#> 490:                           3                50               3
#> 491:                           3                50               3
#> 492:                           3                50               3
#> 493:                           3                50               3
#>      NumberOfFeatures NumberOfInstances NumberOfInstancesWithMissingValues
#>   1:                5               150                                  0
#>   2:                5               150                                  0
#>   3:                5               150                                  0
#>   4:                5               150                                  0
#>   5:                5               150                                  0
#>  ---                                                                      
#> 489:                5               150                                  0
#> 490:                5               150                                  0
#> 491:                5               150                                  0
#> 492:                5               150                                  0
#> 493:                5               150                                  0
#>      NumberOfMissingValues NumberOfNumericFeatures NumberOfSymbolicFeatures
#>   1:                     0                       4                        1
#>   2:                     0                       4                        1
#>   3:                     0                       4                        1
#>   4:                     0                       4                        1
#>   5:                     0                       4                        1
#>  ---                                                                       
#> 489:                     0                       4                        1
#> 490:                     0                       4                        1
#> 491:                     0                       4                        1
#> 492:                     0                       4                        1
#> 493:                     0                       4                        1
# }