OptimizerBatchIrace class that implements iterated racing. Calls
irace::irace() from package irace.
Source
Lopez-Ibanez M, Dubois-Lacoste J, Caceres LP, Birattari M, Stuetzle T (2016). “The irace package: Iterated racing for automatic algorithm configuration.” Operations Research Perspectives, 3, 43–58. doi:10.1016/j.orp.2016.09.002 .
Parameters
instanceslist()
A list of instances where the configurations executed on.targetRunnerParallelfunction()
A function that executes the objective function with a specific parameter configuration and instance. A default function is provided, see section "Target Runner and Instances".
For the meaning of all other parameters, see irace::defaultScenario(). Note
that we have removed all control parameters which refer to the termination of
the algorithm. Use TerminatorEvals instead. Other terminators do not work
with OptimizerBatchIrace.
In contrast to irace::defaultScenario(), we set digits = 15.
This represents double parameters with a higher precision and avoids rounding errors.
Target Runner and Instances
The irace package uses a targetRunner script or R function to evaluate a
configuration on a particular instance. Usually it is not necessary to
specify a targetRunner function when using OptimizerBatchIrace. A default
function is used that forwards several configurations and instances to the
user defined objective function. As usually, the user defined function has
a xs, xss or xdt parameter depending on the used Objective class.
For irace, the function needs an additional instances parameter.
Archive
The Archive holds the following additional columns:
"race"(integer(1))
Race iteration."step"(integer(1))
Step number of race."instance"(integer(1))
Identifies instances across races and steps."configuration"(integer(1))
Identifies configurations across races and steps.
Result
The optimization result (instance$result) is the best performing elite of
the final race. The reported performance is the average performance estimated
on all used instances.
Dictionary
This Optimizer can be instantiated via the dictionary
mlr_optimizers or with the associated sugar function opt():
Progress Bars
$optimize() supports progress bars via the package progressr
combined with a Terminator. Simply wrap the function in
progressr::with_progress() to enable them. We recommend to use package
progress as backend; enable with progressr::handlers("progress").
Super classes
bbotk::Optimizer -> bbotk::OptimizerBatch -> OptimizerBatchIrace
Examples
# runtime of the example is too long
# \donttest{
library(data.table)
search_space = domain = ps(
x1 = p_dbl(-5, 10),
x2 = p_dbl(0, 15)
)
codomain = ps(y = p_dbl(tags = "minimize"))
# branin function with noise
# the noise generates different instances of the branin function
# the noise values are passed via the `instances` parameter
fun = function(xdt, instances) {
ys = branin(xdt[["x1"]], xdt[["x2"]], noise = as.numeric(instances))
data.table(y = ys)
}
# define objective with instances as a constant
objective = ObjectiveRFunDt$new(
fun = fun,
domain = domain,
codomain = codomain,
constants = ps(instances = p_uty()))
instance = OptimInstanceBatchSingleCrit$new(
objective = objective,
search_space = search_space,
terminator = trm("evals", n_evals = 96))
# create instances of branin function
instances = rnorm(10, mean = 0, sd = 0.1)
# load optimizer irace and set branin instances
optimizer = opt("irace", instances = instances)
# modifies the instance by reference
optimizer$optimize(instance)
#> # 2025-07-23 11:59:35 UTC: Initialization
#> # Elitist race
#> # Elitist new instances: 1
#> # Elitist limit: 2
#> # nbIterations: 3
#> # minNbSurvival: 3
#> # nbParameters: 2
#> # seed: 438793322
#> # confidence level: 0.95
#> # budget: 96
#> # mu: 5
#> # deterministic: FALSE
#>
#> # 2025-07-23 11:59:35 UTC: Iteration 1 of 3
#> # experimentsUsed: 0
#> # remainingBudget: 96
#> # currentBudget: 32
#> # nbConfigurations: 5
#> # Markers:
#> x No test is performed.
#> c Configurations are discarded only due to capping.
#> - The test is performed and some configurations are discarded.
#> = The test is performed but no configuration is discarded.
#> ! The test is performed and configurations could be discarded but elite configurations are preserved.
#> . All alive configurations are elite and nothing is discarded.
#>
#> +-+-----------+-----------+-----------+----------------+-----------+--------+-----+----+------+
#> | | Instance| Alive| Best| Mean best| Exp so far| W time| rho|KenW| Qvar|
#> +-+-----------+-----------+-----------+----------------+-----------+--------+-----+----+------+
#> |x| 1| 5| 5| 5.696544597| 5|00:00:00| NA| NA| NA|
#> |x| 2| 5| 5| 5.696544597| 10|00:00:00|+1.00|1.00|0.0000|
#> |x| 3| 5| 5| 5.696544597| 15|00:00:00|+1.00|1.00|0.0000|
#> |x| 4| 5| 5| 5.696544597| 20|00:00:00|+1.00|1.00|0.0000|
#> |-| 5| 1| 5| 5.696544597| 25|00:00:00| NA| NA| NA|
#> +-+-----------+-----------+-----------+----------------+-----------+--------+-----+----+------+
#> Best-so-far configuration: 5 mean value: 5.696544597
#> Description of the best-so-far configuration:
#> .ID. x1 x2 .PARENT.
#> 5 5 2.15160071849823 4.15610745549202 NA
#>
#> # 2025-07-23 11:59:35 UTC: Elite configurations (first number is the configuration ID; listed from best to worst according to the sum of ranks):
#> x1 x2
#> 5 2.15160071849823 4.15610745549202
#> # 2025-07-23 11:59:35 UTC: Iteration 2 of 3
#> # experimentsUsed: 25
#> # remainingBudget: 71
#> # currentBudget: 35
#> # nbConfigurations: 5
#> # Markers:
#> x No test is performed.
#> c Configurations are discarded only due to capping.
#> - The test is performed and some configurations are discarded.
#> = The test is performed but no configuration is discarded.
#> ! The test is performed and configurations could be discarded but elite configurations are preserved.
#> . All alive configurations are elite and nothing is discarded.
#>
#> +-+-----------+-----------+-----------+----------------+-----------+--------+-----+----+------+
#> | | Instance| Alive| Best| Mean best| Exp so far| W time| rho|KenW| Qvar|
#> +-+-----------+-----------+-----------+----------------+-----------+--------+-----+----+------+
#> |x| 6| 5| 6| 2.058597335| 5|00:00:00| NA| NA| NA|
#> |x| 1| 5| 6| 2.058597335| 9|00:00:00|+1.00|1.00|0.0000|
#> |x| 4| 5| 6| 2.058597335| 13|00:00:00|+1.00|1.00|0.0000|
#> |x| 5| 5| 6| 2.058597335| 17|00:00:00|+1.00|1.00|0.0000|
#> |-| 2| 2| 6| 2.058597335| 21|00:00:00|+1.00|1.00|0.0000|
#> +-+-----------+-----------+-----------+----------------+-----------+--------+-----+----+------+
#> Best configuration for the instances in this race: 6
#> Best-so-far configuration: 5 mean value: 5.696544597
#> Description of the best-so-far configuration:
#> .ID. x1 x2 .PARENT.
#> 5 5 2.15160071849823 4.15610745549202 NA
#>
#> # 2025-07-23 11:59:36 UTC: Elite configurations (first number is the configuration ID; listed from best to worst according to the sum of ranks):
#> x1 x2
#> 5 2.15160071849823 4.15610745549202
#> 6 9.43809640151962 1.19790239189972
#> # 2025-07-23 11:59:36 UTC: Iteration 3 of 3
#> # experimentsUsed: 46
#> # remainingBudget: 50
#> # currentBudget: 50
#> # nbConfigurations: 7
#> # Markers:
#> x No test is performed.
#> c Configurations are discarded only due to capping.
#> - The test is performed and some configurations are discarded.
#> = The test is performed but no configuration is discarded.
#> ! The test is performed and configurations could be discarded but elite configurations are preserved.
#> . All alive configurations are elite and nothing is discarded.
#>
#> +-+-----------+-----------+-----------+----------------+-----------+--------+-----+----+------+
#> | | Instance| Alive| Best| Mean best| Exp so far| W time| rho|KenW| Qvar|
#> +-+-----------+-----------+-----------+----------------+-----------+--------+-----+----+------+
#> |x| 7| 7| 12| 0.7123056014| 7|00:00:00| NA| NA| NA|
#> |x| 3| 7| 12| 0.7123056014| 13|00:00:00|+1.00|1.00|0.0000|
#> |x| 2| 7| 12| 0.7123056014| 18|00:00:00|+1.00|1.00|0.0000|
#> |x| 4| 7| 12| 0.7123056014| 23|00:00:00|+1.00|1.00|0.0000|
#> |-| 1| 3| 12| 0.7123056014| 28|00:00:00|+1.00|1.00|0.0000|
#> +-+-----------+-----------+-----------+----------------+-----------+--------+-----+----+------+
#> Best configuration for the instances in this race: 12
#> Best-so-far configuration: 6 mean value: 2.058597335
#> Description of the best-so-far configuration:
#> .ID. x1 x2 .PARENT.
#> 6 6 9.43809640151962 1.19790239189972 5
#>
#> # 2025-07-23 11:59:36 UTC: Elite configurations (first number is the configuration ID; listed from best to worst according to the sum of ranks):
#> x1 x2
#> 6 9.43809640151962 1.19790239189972
#> 5 2.15160071849823 4.15610745549202
#> 12 3.00459676598218 1.91049682606301
#> # 2025-07-23 11:59:36 UTC: Iteration 4 of 4
#> # experimentsUsed: 74
#> # remainingBudget: 22
#> # currentBudget: 22
#> # nbConfigurations: 4
#> # Markers:
#> x No test is performed.
#> c Configurations are discarded only due to capping.
#> - The test is performed and some configurations are discarded.
#> = The test is performed but no configuration is discarded.
#> ! The test is performed and configurations could be discarded but elite configurations are preserved.
#> . All alive configurations are elite and nothing is discarded.
#>
#> +-+-----------+-----------+-----------+----------------+-----------+--------+-----+----+------+
#> | | Instance| Alive| Best| Mean best| Exp so far| W time| rho|KenW| Qvar|
#> +-+-----------+-----------+-----------+----------------+-----------+--------+-----+----+------+
#> |x| 8| 4| 12| 0.7123056014| 4|00:00:00| NA| NA| NA|
#> |x| 7| 4| 12| 0.7123056014| 5|00:00:00|+1.00|1.00|0.0000|
#> |x| 6| 4| 12| 0.7123056014| 7|00:00:00|+1.00|1.00|0.0000|
#> |x| 5| 4| 12| 0.7123056014| 9|00:00:00|+1.00|1.00|0.0000|
#> |-| 2| 3| 12| 0.7123056014| 10|00:00:00|+1.00|1.00|0.0000|
#> |.| 3| 3| 12| 0.7123056014| 10|00:00:00|+1.00|1.00|0.0000|
#> |.| 4| 3| 12| 0.7123056014| 10|00:00:00|+1.00|1.00|0.0000|
#> |.| 1| 3| 12| 0.7123056014| 10|00:00:00|+1.00|1.00|0.0000|
#> +-+-----------+-----------+-----------+----------------+-----------+--------+-----+----+------+
#> Best-so-far configuration: 12 mean value: 0.7123056014
#> Description of the best-so-far configuration:
#> .ID. x1 x2 .PARENT.
#> 12 12 3.00459676598218 1.91049682606301 5
#>
#> # 2025-07-23 11:59:36 UTC: Elite configurations (first number is the configuration ID; listed from best to worst according to the sum of ranks):
#> x1 x2
#> 12 3.00459676598218 1.91049682606301
#> 6 9.43809640151962 1.19790239189972
#> 5 2.15160071849823 4.15610745549202
#> # 2025-07-23 11:59:36 UTC: Iteration 5 of 5
#> # experimentsUsed: 84
#> # remainingBudget: 12
#> # currentBudget: 12
#> # nbConfigurations: 4
#> # Markers:
#> x No test is performed.
#> c Configurations are discarded only due to capping.
#> - The test is performed and some configurations are discarded.
#> = The test is performed but no configuration is discarded.
#> ! The test is performed and configurations could be discarded but elite configurations are preserved.
#> . All alive configurations are elite and nothing is discarded.
#>
#> +-+-----------+-----------+-----------+----------------+-----------+--------+-----+----+------+
#> | | Instance| Alive| Best| Mean best| Exp so far| W time| rho|KenW| Qvar|
#> +-+-----------+-----------+-----------+----------------+-----------+--------+-----+----+------+
#> |x| 8| 4| 12| 0.7123056014| 1|00:00:00| NA| NA| NA|
#> |x| 3| 4| 12| 0.7123056014| 2|00:00:00|+1.00|1.00|0.0000|
#> |x| 2| 4| 12| 0.7123056014| 3|00:00:00|+1.00|1.00|0.0000|
#> |x| 1| 4| 12| 0.7123056014| 4|00:00:00|+1.00|1.00|0.0000|
#> |-| 7| 3| 12| 0.7123056014| 5|00:00:00|+1.00|1.00|0.0000|
#> |.| 5| 3| 12| 0.7123056014| 5|00:00:00|+1.00|1.00|0.0000|
#> |.| 6| 3| 12| 0.7123056014| 5|00:00:00|+1.00|1.00|0.0000|
#> |.| 4| 3| 12| 0.7123056014| 5|00:00:00|+1.00|1.00|0.0000|
#> +-+-----------+-----------+-----------+----------------+-----------+--------+-----+----+------+
#> Best-so-far configuration: 12 mean value: 0.7123056014
#> Description of the best-so-far configuration:
#> .ID. x1 x2 .PARENT.
#> 12 12 3.00459676598218 1.91049682606301 5
#>
#> # 2025-07-23 11:59:36 UTC: Elite configurations (first number is the configuration ID; listed from best to worst according to the sum of ranks):
#> x1 x2
#> 12 3.00459676598218 1.91049682606301
#> 6 9.43809640151962 1.19790239189972
#> 5 2.15160071849823 4.15610745549202
#> # 2025-07-23 11:59:36 UTC: Stopped because there is not enough budget left to race more than the minimum (3).
#> # You may either increase the budget or set 'minNbSurvival' to a lower value.
#> # Iteration: 6
#> # nbIterations: 6
#> # experimentsUsed: 89
#> # timeUsed: 0
#> # remainingBudget: 7
#> # currentBudget: 7
#> # number of elites: 3
#> # nbConfigurations: 3
#> # Total CPU user time: 1.562, CPU sys time: 0.013, Wall-clock time: 1.576
#> # 2025-07-23 11:59:37 UTC: Starting post-selection:
#> # Configurations selected: 12, 6, 5, 1.
#> # Pending instances: 1, 1, 1, 4.
#> # 2025-07-23 11:59:37 UTC: seed: 438793322
#> # Configurations: 4
#> # Available experiments: 7
#> # minSurvival: 1
#> # Markers:
#> x No test is performed.
#> c Configurations are discarded only due to capping.
#> - The test is performed and some configurations are discarded.
#> = The test is performed but no configuration is discarded.
#> ! The test is performed and configurations could be discarded but elite configurations are preserved.
#> . All alive configurations are elite and nothing is discarded.
#>
#> +-+-----------+-----------+-----------+----------------+-----------+--------+-----+----+------+
#> | | Instance| Alive| Best| Mean best| Exp so far| W time| rho|KenW| Qvar|
#> +-+-----------+-----------+-----------+----------------+-----------+--------+-----+----+------+
#> |x| 7| 4| 12| 0.7123056014| 1|00:00:00| NA| NA| NA|
#> |.| 1| 4| 12| 0.7123056014| 1|00:00:00|+1.00|1.00|0.0000|
#> |.| 4| 4| 12| 0.7123056014| 1|00:00:00|+1.00|1.00|0.0000|
#> |.| 5| 4| 12| 0.7123056014| 1|00:00:00|+1.00|1.00|0.0000|
#> |x| 8| 4| 12| 0.7123056014| 2|00:00:00|+1.00|1.00|0.0000|
#> |.| 3| 4| 12| 0.7123056014| 2|00:00:00|+1.00|1.00|0.0000|
#> |.| 2| 4| 12| 0.7123056014| 2|00:00:00|+1.00|1.00|0.0000|
#> |-| 6| 1| 12| 0.7123056014| 3|00:00:00| NA| NA| NA|
#> +-+-----------+-----------+-----------+----------------+-----------+--------+-----+----+------+
#> Best-so-far configuration: 12 mean value: 0.7123056014
#> Description of the best-so-far configuration:
#> .ID. x1 x2 .PARENT.
#> 12 12 3.00459676598218 1.91049682606301 5
#>
#> # 2025-07-23 11:59:37 UTC: Elite configurations (first number is the configuration ID; listed from best to worst according to the sum of ranks):
#> x1 x2
#> 12 3.00459676598218 1.91049682606301
#> # Total CPU user time: 1.822, CPU sys time: 0.044, Wall-clock time: 1.867
#> x1 x2 configuration x_domain y
#> <num> <num> <int> <list> <num>
#> 1: 3.004597 1.910497 12 <list[2]> 0.7123056
# best scoring configuration
instance$result
#> x1 x2 configuration x_domain y
#> <num> <num> <int> <list> <num>
#> 1: 3.004597 1.910497 12 <list[2]> 0.7123056
# all evaluations
as.data.table(instance$archive)
#> x1 x2 y race step instance configuration
#> <num> <num> <num> <int> <int> <int> <int>
#> 1: 4.0266007 9.7811070 69.4498893 1 1 1 1
#> 2: -3.4733993 2.2811072 117.6810288 1 1 1 2
#> 3: 0.2766007 13.5311070 82.6217692 1 1 1 3
#> 4: 7.7766007 6.0311075 31.8604553 1 1 1 4
#> 5: 2.1516007 4.1561075 5.6965446 1 1 1 5
#> 6: 4.0266007 9.7811070 69.4498893 1 1 5 1
#> 7: -3.4733993 2.2811072 117.6810288 1 1 5 2
#> 8: 0.2766007 13.5311070 82.6217692 1 1 5 3
#> 9: 7.7766007 6.0311075 31.8604553 1 1 5 4
#> 10: 2.1516007 4.1561075 5.6965446 1 1 5 5
#> 11: 4.0266007 9.7811070 69.4498893 1 1 8 1
#> 12: -3.4733993 2.2811072 117.6810288 1 1 8 2
#> 13: 0.2766007 13.5311070 82.6217692 1 1 8 3
#> 14: 7.7766007 6.0311075 31.8604553 1 1 8 4
#> 15: 2.1516007 4.1561075 5.6965446 1 1 8 5
#> 16: 4.0266007 9.7811070 69.4498893 1 1 2 1
#> 17: -3.4733993 2.2811072 117.6810288 1 1 2 2
#> 18: 0.2766007 13.5311070 82.6217692 1 1 2 3
#> 19: 7.7766007 6.0311075 31.8604553 1 1 2 4
#> 20: 2.1516007 4.1561075 5.6965446 1 1 2 5
#> 21: 4.0266007 9.7811070 69.4498893 1 1 7 1
#> 22: -3.4733993 2.2811072 117.6810288 1 1 7 2
#> 23: 0.2766007 13.5311070 82.6217692 1 1 7 3
#> 24: 7.7766007 6.0311075 31.8604553 1 1 7 4
#> 25: 2.1516007 4.1561075 5.6965446 1 1 7 5
#> 26: 2.1516007 4.1561075 5.6965446 2 1 4 5
#> 27: 9.4380964 1.1979024 2.0585973 2 1 4 6
#> 28: 2.6662158 10.7114427 66.0482550 2 1 4 7
#> 29: -0.9377328 6.2995126 17.3878051 2 1 4 8
#> 30: -0.2024575 4.5803442 22.4586034 2 1 4 9
#> 31: 9.4380964 1.1979024 2.0585973 2 1 1 6
#> 32: 2.6662158 10.7114427 66.0482550 2 1 1 7
#> 33: -0.9377328 6.2995126 17.3878051 2 1 1 8
#> 34: -0.2024575 4.5803442 22.4586034 2 1 1 9
#> 35: 9.4380964 1.1979024 2.0585973 2 1 2 6
#> 36: 2.6662158 10.7114427 66.0482550 2 1 2 7
#> 37: -0.9377328 6.2995126 17.3878051 2 1 2 8
#> 38: -0.2024575 4.5803442 22.4586034 2 1 2 9
#> 39: 9.4380964 1.1979024 2.0585973 2 1 7 6
#> 40: 2.6662158 10.7114427 66.0482550 2 1 7 7
#> 41: -0.9377328 6.2995126 17.3878051 2 1 7 8
#> 42: -0.2024575 4.5803442 22.4586034 2 1 7 9
#> 43: 9.4380964 1.1979024 2.0585973 2 1 5 6
#> 44: 2.6662158 10.7114427 66.0482550 2 1 5 7
#> 45: -0.9377328 6.2995126 17.3878051 2 1 5 8
#> 46: -0.2024575 4.5803442 22.4586034 2 1 5 9
#> 47: 2.1516007 4.1561075 5.6965446 3 1 9 5
#> 48: 9.4380964 1.1979024 2.0585973 3 1 9 6
#> 49: 7.4659299 3.1320151 16.9226397 3 1 9 10
#> 50: 7.5366533 0.7759566 13.3175340 3 1 9 11
#> 51: 3.0045968 1.9104968 0.7123056 3 1 9 12
#> 52: 4.7920415 1.8426197 11.0168730 3 1 9 13
#> 53: 4.1408296 3.9262104 10.1026354 3 1 9 14
#> 54: 9.4380964 1.1979024 2.0585973 3 1 8 6
#> 55: 7.4659299 3.1320151 16.9226397 3 1 8 10
#> 56: 7.5366533 0.7759566 13.3175340 3 1 8 11
#> 57: 3.0045968 1.9104968 0.7123056 3 1 8 12
#> 58: 4.7920415 1.8426197 11.0168730 3 1 8 13
#> 59: 4.1408296 3.9262104 10.1026354 3 1 8 14
#> 60: 7.4659299 3.1320151 16.9226397 3 1 5 10
#> 61: 7.5366533 0.7759566 13.3175340 3 1 5 11
#> 62: 3.0045968 1.9104968 0.7123056 3 1 5 12
#> 63: 4.7920415 1.8426197 11.0168730 3 1 5 13
#> 64: 4.1408296 3.9262104 10.1026354 3 1 5 14
#> 65: 7.4659299 3.1320151 16.9226397 3 1 2 10
#> 66: 7.5366533 0.7759566 13.3175340 3 1 2 11
#> 67: 3.0045968 1.9104968 0.7123056 3 1 2 12
#> 68: 4.7920415 1.8426197 11.0168730 3 1 2 13
#> 69: 4.1408296 3.9262104 10.1026354 3 1 2 14
#> 70: 7.4659299 3.1320151 16.9226397 3 1 1 10
#> 71: 7.5366533 0.7759566 13.3175340 3 1 1 11
#> 72: 3.0045968 1.9104968 0.7123056 3 1 1 12
#> 73: 4.7920415 1.8426197 11.0168730 3 1 1 13
#> 74: 4.1408296 3.9262104 10.1026354 3 1 1 14
#> 75: 9.4380964 1.1979024 2.0585973 4 1 10 6
#> 76: 2.1516007 4.1561075 5.6965446 4 1 10 5
#> 77: 3.0045968 1.9104968 0.7123056 4 1 10 12
#> 78: 2.3588556 2.7426348 3.2414939 4 1 10 15
#> 79: 2.3588556 2.7426348 3.2414939 4 1 9 15
#> 80: 3.0045968 1.9104968 0.7123056 4 1 4 12
#> 81: 2.3588556 2.7426348 3.2414939 4 1 4 15
#> 82: 3.0045968 1.9104968 0.7123056 4 1 7 12
#> 83: 2.3588556 2.7426348 3.2414939 4 1 7 15
#> 84: 2.3588556 2.7426348 3.2414939 4 1 5 15
#> 85: 3.6196369 3.2723983 3.2717513 5 1 10 16
#> 86: 3.6196369 3.2723983 3.2717513 5 1 8 16
#> 87: 3.6196369 3.2723983 3.2717513 5 1 5 16
#> 88: 3.6196369 3.2723983 3.2717513 5 1 1 16
#> 89: 3.6196369 3.2723983 3.2717513 5 1 9 16
#> 90: 4.0266007 9.7811070 69.4498893 6 1 9 1
#> 91: 4.0266007 9.7811070 69.4498893 6 1 10 1
#> 92: 4.0266007 9.7811070 69.4498893 6 1 4 1
#> x1 x2 y race step instance configuration
#> timestamp batch_nr
#> <POSc> <int>
#> 1: 2025-07-23 11:59:35 1
#> 2: 2025-07-23 11:59:35 1
#> 3: 2025-07-23 11:59:35 1
#> 4: 2025-07-23 11:59:35 1
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#> timestamp batch_nr
# }