source: cpp/frams/genetics/fn/fn_oper.cpp @ 829

// This file is a part of Framsticks SDK.  http://www.framsticks.com/
// Copyright (C) 1999-2018  Maciej Komosinski and Szymon Ulatowski.
// See LICENSE.txt for details.

#include "fn_oper.h"
#include "fn_conv.h"
#include <common/nonstd.h> //randomN, rnd01


/**
\class GenoOper_fn

This genetic representation only stores a vector of real numbers. A fitness function must be provided
for the gene pool, for example the "Booth function" would be:

var X = String.deserialize(this.geno.rawgenotype); //a vector of real values
var result = Math.pow(X[0]+2*X[1]-7,2) + Math.pow(2*X[0]+X[1]-5,2);
return -result; //negation because Framsticks assumes maximization, and the original function needs to be minimized
*/



#define FIELDSTRUCT GenoOper_fn
static ParamEntry GENOfnparam_tab[] =
{
        { "Genetics: fn", 1, 6, },
        { "fn_xover", 0, 0, "Fraction inherited in linear mix crossover", "f 0.5 1.0 0.9", FIELD(xover_proportion), "0.5 => children are averaged parents.\n0.8 => children are only 20% different from parents.\n1.0 => each child is identical to one parent (no crossover).", },
        { "fn_xover_random", 0, 0, "Random fraction inherited in crossover", "d 0 1 1", FIELD(xover_proportion_random), "If active, the amount of linear mix is random in each crossover operation, so the \"Fraction inherited in linear mix crossover\" parameter is ignored.", },
        { "fn_mut_bound_low", 1, 0, "Lower bounds for mutation", "s 0 0 [-10.0, -10.0]", FIELD(mut_bound_low), "A vector of lower bounds (one real value for each variable)", },
        { "fn_mut_bound_high", 1, 0, "Higher bounds for mutation", "s 0 0 [10.0, 10.0]", FIELD(mut_bound_high), "A vector of higher bounds (one real value for each variable)", },
        { "fn_mut_stddev", 1, 0, "Standard deviations for mutation", "s 0 0 [0.1, 0.1]", FIELD(mut_stddev), "A vector of standard deviations (one real value for each variable)", },
        { "fn_mut_single_var", 0, 0, "Mutate only a single variable", "d 0 1 0", FIELD(mut_single_var), "If active, only a single randomly selected variable will be mutated in each mutation operation. Otherwise all variables will be mutated.", },
        { 0, },
};
#undef FIELDSTRUCT



GenoOper_fn::GenoOper_fn()
{
        par.setParamTab(GENOfnparam_tab);
        par.select(this);
        par.setDefault();
        supported_format = 'n';
}

int GenoOper_fn::checkValidity(const char* gene, const char *genoname)
{
        vector<double> values = GenoConv_fn0::stringToVector(gene);
        return values.size() > 0 ? GENOPER_OK : 1;
}

int GenoOper_fn::validate(char *&gene, const char *genoname)
{
        vector<double> values = GenoConv_fn0::stringToVector(gene);
        if (values.size() == 0)
                values.push_back(0.0);
        string validated = GenoConv_fn0::vectorToString(values);
        free(gene);
        gene = strdup(validated.c_str()); //reallocate
        return GENOPER_OK;
}

//Creep-mutate variable(s)
int GenoOper_fn::mutate(char *&gene, float &chg, int &method)
{
        method = 0;
        vector<double> values = GenoConv_fn0::stringToVector(gene);
        if (values.size() == 0)
                return GENOPER_OPFAIL;
        vector<double> bound_low = GenoConv_fn0::stringToVector(mut_bound_low.c_str());
        vector<double> bound_high = GenoConv_fn0::stringToVector(mut_bound_high.c_str());
        vector<double> stddev = GenoConv_fn0::stringToVector(mut_stddev.c_str());
        if (bound_low.size() != bound_high.size() || bound_high.size() != stddev.size() || stddev.size() != values.size())
        {
                logPrintf("GenoOper_fn", "mutate", LOG_ERROR, "The solution vector, bound vectors, and standard deviation vectors must all have the same number of values");
                return GENOPER_OPFAIL;
        }

        if (mut_single_var) //mutate only one, randomly selected variable
        {
                int which = randomN(values.size());
                values[which] = GenoOperators::mutateCreep('f', values[which], bound_low[which], bound_high[which], stddev[which], false);
                chg = 1.0f / values.size();
        }
        else //mutate all variables
        {
                for (int which = 0; which < (int)values.size(); which++)
                        values[which] = GenoOperators::mutateCreep('f', values[which], bound_low[which], bound_high[which], stddev[which], false);
                chg = 1.0f;
        }
        string saved = GenoConv_fn0::vectorToString(values);
        free(gene);
        gene = strdup(saved.c_str()); //reallocate
        return GENOPER_OK;
}

//Averaging crossover
int GenoOper_fn::crossOver(char *&g1, char *&g2, float& chg1, float& chg2)
{
        //g1 = strdup("[1,0.5,0.5,0.5,0.5,1,1]"); //testing...
        //g2 = strdup("[4,1,  1,  1,  1,  2,2]"); //testing...
        //xover_proportion = 0.1; //testing...

        double proportion = xover_proportion_random ? 0.5 + rnd0N(0.5) : xover_proportion;

        chg1 = proportion;
        chg2 = 1 - proportion;

        vector<double> v1 = GenoConv_fn0::stringToVector(g1);
        vector<double> v2 = GenoConv_fn0::stringToVector(g2);

        if (v1.size() != v2.size())
        {
                logPrintf("GenoOper_fn", "crossOver", LOG_ERROR, "Tried to cross over solutions with a differing number of variables (%d and %d)", v1.size(), v2.size());
                return GENOPER_OPFAIL;
        }

        GenoOperators::linearMix(v1, v2, proportion);

        string saved = GenoConv_fn0::vectorToString(v1);
        free(g1);
        g1 = strdup(saved.c_str()); //reallocate
        saved = GenoConv_fn0::vectorToString(v2);
        free(g2);
        g2 = strdup(saved.c_str()); //reallocate
        return GENOPER_OK;
}

//Applying some colors and font styles...
uint32_t GenoOper_fn::style(const char *g, int pos)
{
        char ch = g[pos];
        uint32_t style = GENSTYLE_CS(0, GENSTYLE_INVALID); //default, should be changed below
        if (strchr("-.e 0123456789", ch) != NULL)
                style = GENSTYLE_CS(GENCOLOR_NUMBER, GENSTYLE_NONE);
        else if (strchr("[,]", ch) != NULL)
                style = GENSTYLE_RGBS(0, 0, 0, GENSTYLE_BOLD);
        return style;
}