blt-gp/examples/gp_test_7.cpp

/*
 *  <Short Description>
 *  Copyright (C) 2024  Brett Terpstra
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
#include <blt/gp/program.h>
#include <blt/gp/generators.h>
#include <blt/gp/tree.h>
#include <blt/std/logging.h>
#include <blt/gp/transformers.h>

static constexpr long SEED = 41912;

blt::gp::prog_config_t config = blt::gp::prog_config_t().set_elite_count(0);

blt::gp::type_provider type_system;
blt::gp::gp_program program(type_system, blt::gp::random_t{SEED}, config); // NOLINT
std::array<float, 500> result_container;

blt::gp::operation_t add([](float a, float b) { return a + b; }, "add"); // 0
blt::gp::operation_t sub([](float a, float b) { return a - b; }, "sub"); // 1
blt::gp::operation_t mul([](float a, float b) { return a * b; }, "mul"); // 2
blt::gp::operation_t pro_div([](float a, float b) { return b == 0 ? 0.0f : a / b; }, "div"); // 3

blt::gp::operation_t op_if([](bool b, float a, float c) { return b ? a : c; }, "if"); // 4
blt::gp::operation_t eq_f([](float a, float b) { return a == b; }, "eq_f"); // 5
blt::gp::operation_t eq_b([](bool a, bool b) { return a == b; }, "eq_b"); // 6
blt::gp::operation_t lt([](float a, float b) { return a < b; }, "lt"); // 7
blt::gp::operation_t gt([](float a, float b) { return a > b; }, "gt"); // 8
blt::gp::operation_t op_and([](bool a, bool b) { return a && b; }, "and"); // 9
blt::gp::operation_t op_or([](bool a, bool b) { return a || b; }, "or"); // 10
blt::gp::operation_t op_xor([](bool a, bool b) { return static_cast<bool>(a ^ b); }, "xor"); // 11
blt::gp::operation_t op_not([](bool b) { return !b; }, "not"); // 12

blt::gp::operation_t lit([]() { // 13
    //static std::uniform_real_distribution<float> dist(-32000, 32000);
//    static std::uniform_real_distribution<float> dist(0.0f, 10.0f);
    return program.get_random().get_float(0.0f, 10.0f);
}, "lit");

void print_best()
{
    BLT_TRACE("----{Current Gen: %ld}----", program.get_current_generation());
    auto best = program.get_best<10>();
    
    for (auto& v : best)
        BLT_TRACE(v.get().get_evaluation_value<float>(nullptr));
    std::string small("--------------------------");
    for (blt::size_t i = 0; i < std::to_string(program.get_current_generation()).size(); i++)
        small += "-";
    BLT_TRACE(small);
}

/**
 * This is a test using multiple types with blt::gp
 */
int main()
{
    type_system.register_type<float>();
    type_system.register_type<bool>();
    
    blt::gp::operator_builder builder{type_system};
    builder.add_operator(add);
    builder.add_operator(sub);
    builder.add_operator(mul);
    builder.add_operator(pro_div);
    
    builder.add_operator(op_if);
    builder.add_operator(eq_f);
    builder.add_operator(eq_b);
    builder.add_operator(lt);
    builder.add_operator(gt);
    builder.add_operator(op_and);
    builder.add_operator(op_or);
    builder.add_operator(op_xor);
    builder.add_operator(op_not);
    
    builder.add_operator(lit, true);
    
    program.set_operations(builder.build());
    
    program.generate_population(type_system.get_type<float>().id());
    
    while (!program.should_terminate())
    {
        program.evaluate_fitness([](blt::gp::tree_t& current_tree, decltype(result_container)& container, blt::size_t index) {
            container[index] = current_tree.get_evaluation_value<float>(nullptr);
            return container[index];
        }, result_container);
        print_best();
        program.create_next_generation(blt::gp::select_tournament_t{}, blt::gp::select_tournament_t{},
                                       blt::gp::select_tournament_t{});
        program.next_generation();
    }
    
    program.evaluate_fitness([](blt::gp::tree_t& current_tree, decltype(result_container)& container, blt::size_t index) {
        container[index] = current_tree.get_evaluation_value<float>(nullptr);
        return container[index];
    }, result_container);
    
    print_best();
    
    return 0;
}