readParameters {irace}R Documentation

readParameters

Description

readParameters reads the parameters to be tuned by irace from a file or directly from a character string.

Usage

readParameters(file, digits = 4, debugLevel = 0, text)

Arguments

file

(character(1))
Filename containing the definitions of the parameters to be tuned.

digits

The number of decimal places to be considered for the real parameters.

debugLevel

(integer(1))
Larger values produce more verbose output.

text

(character(1))
If file is not supplied and this is, then parameters are read from the value of text via a text connection.

Details

Either file or text must be given. If file is given, the parameters are read from the file file. If text is given instead, the parameters are read directly from the text character string. In both cases, the parameters must be given (in text or in the file whose name is file) in the expected form. See the documentation for details. If none of these parameters is given, irace will stop with an error.

A fixed parameter is a parameter that should not be sampled but instead should be always set to the only value of its domain. In this function we set isFixed to TRUE only if the parameter is a categorical and has only one possible value. If it is an integer and the minimum and maximum are equal, or it is a real and the minimum and maximum values satisfy round(minimum, digits) == round(maximum, digits), then the parameter description is rejected as invalid to identify potential user errors.

Value

A list containing the definitions of the parameters read. The list is structured as follows:

names

Vector that contains the names of the parameters.

types

Vector that contains the type of each parameter 'i', 'c', 'r', 'o'. Numerical parameters can be sampled in a log-scale with 'i,log' and 'r,log' (no spaces).

switches

Vector that contains the switches to be used for the parameters on the command line.

domain

List of vectors, where each vector may contain two values (minimum, maximum) for real and integer parameters, or possibly more for categorical parameters.

conditions

List of R logical expressions, with variables corresponding to parameter names.

isFixed

Logical vector that specifies which parameter is fixed and, thus, it does not need to be tuned.

nbParameters

An integer, the total number of parameters.

nbFixed

An integer, the number of parameters with a fixed value.

nbVariable

Number of variable (to be tuned) parameters.

Author(s)

Manuel López-Ibáñez and Jérémie Dubois-Lacoste

Examples

 ## Read the parameters directly from text
 parameters.table <- '
 # name       switch           type values               [conditions (using R syntax)]
 algorithm    "--"             c    (as,mmas,eas,ras,acs)
 localsearch  "--localsearch " c    (0, 1, 2, 3)
 alpha        "--alpha "       r    (0.00, 5.00)
 beta         "--beta "        r    (0.00, 10.00)
 rho          "--rho  "        r    (0.01, 1.00)
 ants         "--ants "        i            (5, 100)
 q0           "--q0 "          r    (0.0, 1.0)           | algorithm == "acs"
 rasrank      "--rasranks "    i    (1, 100)             | algorithm == "ras"
 elitistants  "--elitistants " i    (1, 750)             | algorithm == "eas"
 nnls         "--nnls "        i    (5, 50)              | localsearch %in% c(1,2,3)
 dlb          "--dlb "         c    (0, 1)               | localsearch %in% c(1,2,3)
 '
 parameters <- readParameters(text=parameters.table)
 str(parameters)
[Package irace version 3.4.1 Index]