target_runner_default function

Default targetRunner function.

Use it as an advanced example of how to create your own targetRunner function.

target_runner_default(experiment, scenario)

Arguments

• experiment: A list describing the experiment. It contains at least:

  • id_configuration: An alphanumeric string that uniquely identifies a configuration;
  • id_instance: An alphanumeric string that uniquely identifies an instance;
  • seed: Seed for the random number generator to be used for this evaluation, ignore the seed for deterministic algorithms;
  • instance: String giving the instance to be used for this evaluation;
  • bound: (only when capping is enabled) Time bound for the execution;
  • configuration: 1-row data frame with a column per parameter name;

• scenario: list()

  Data structure containing irace

  settings. The data structure has to be the one returned by the function defaultScenario() or readScenario().

Returns

If targetEvaluator is NULL, then the targetRunner

function must return a list with at least one element "cost", the numerical value corresponding to the evaluation of the given configuration on the given instance.

If the scenario option maxTime is non-zero or if capping is enabled then the list must contain at least another element "time" that reports the execution time for this call to targetRunner. The return list may also contain the following optional elements that are used by irace for reporting errors in targetRunner:

• error: is a string used to report an error;
• outputRaw: is a string used to report the raw output of calls to an external program or function;
• call: is a string used to report how targetRunner called an external program or function.

Author(s)

Manuel López-Ibáñez and Jérémie Dubois-Lacoste