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/**
* @file line_search_test.cpp
* @author Chenzhe Diao
* @author Marcus Edel
* @author Conrad Sanderson
*
* ensmallen is free software; you may redistribute it and/or modify it under
* the terms of the 3-clause BSD license. You should have received a copy of
* the 3-clause BSD license along with ensmallen. If not, see
* http://www.opensource.org/licenses/BSD-3-Clause for more information.
*/
#include <ensmallen.hpp>
#include "catch.hpp"
#include "test_types.hpp"
using namespace arma;
using namespace ens;
using namespace ens::test;
/**
* Simple test of Line Search with TestFuncFW function.
*/
TEMPLATE_TEST_CASE("FuncFWTest", "[LineSearch]", ENS_TEST_TYPES)
{
typedef typename TestType::elem_type ElemType;
TestType x1 = zeros<TestType>(3, 1);
TestType x2 = { 0.2, 0.4, 0.6 };
x2 = x2.t();
TestFuncFW<TestType> f;
LineSearch s;
ElemType result = s.Optimize(f, x1, x2);
REQUIRE(result == Approx(0.0).margin(Tolerances<TestType>::Obj));
REQUIRE((x2(0) - 0.1) == Approx(0.0).margin(Tolerances<TestType>::Coord));
REQUIRE((x2(1) - 0.2) == Approx(0.0).margin(Tolerances<TestType>::Coord));
REQUIRE((x2(2) - 0.3) == Approx(0.0).margin(Tolerances<TestType>::Coord));
}
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