64 lines
1.4 KiB
Go
64 lines
1.4 KiB
Go
// Copyright 2022 wanderer <a_mirre at utb dot cz>
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// SPDX-License-Identifier: GPL-3.0-or-later
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package bench
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import "math"
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// Functions is a string-func map of function names and specific bench funcs
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// for easier iterable access.
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var Functions = map[string]func([]float64) float64{
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"Schwefel": Schwefel,
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"De Jong 1st": DeJong1st,
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"De Jong 2nd": DeJong2nd,
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}
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var FuncNames = map[int]string{
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0: "Schwefel",
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1: "De Jong 1st",
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2: "De Jong 2nd",
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}
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// Function params maps function names to their funcParams for easier iterable
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// access.
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var FunctionParams = map[string]funcParams{
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"Schwefel": SchwefelParams,
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"De Jong 1st": DeJong1Params,
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"De Jong 2nd": DeJong2Params,
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}
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// Schwefel computes the value of the Schwefel function for x.
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func Schwefel(x []float64) float64 {
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// - Domain is | x_i | < 500
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// - Global minimum at fmin = -122569.5 at x_i = 420.9687
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var res float64
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for _, val := range x {
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res += val * math.Sin(math.Sqrt(math.Abs(val)))
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}
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return 418.9829*float64(len(x)) - res
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}
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// DeJong1st computes the value of the 1st De Jong function for x.
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func DeJong1st(x []float64) float64 {
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var res float64
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for _, val := range x {
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res += math.Pow(val, 2)
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}
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return res
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}
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// DeJong2nd computes the value of the 2nd De Jong function for x.
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func DeJong2nd(x []float64) float64 {
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var res float64
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for _, val := range x {
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res += math.Floor(val)
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}
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return res
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}
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