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/**
* @file snapshot_ensembles.cpp
* @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.
*/
#if defined(ENS_USE_COOT)
#include <armadillo>
#include <bandicoot>
#endif
#include <ensmallen.hpp>
#include "catch.hpp"
#include "test_function_tools.hpp"
#include "test_types.hpp"
using namespace ens;
using namespace ens::test;
/*
* Test that the step size resets after a specified number of epochs.
*/
TEMPLATE_TEST_CASE("SnapshotEnsembles_ResetTest", "[SnapshotEnsembles]",
ENS_ALL_CPU_TEST_TYPES)
{
const double stepSize = 0.5;
TestType iterate;
// Now run cyclical decay policy with a couple of multiplicators and initial
// restarts.
for (size_t restart = 5; restart < 100; restart += 10)
{
for (size_t mult = 2; mult < 5; ++mult)
{
double epochStepSize = stepSize;
SnapshotEnsembles snapshotEnsembles(restart,
double(mult), stepSize, 1000, 2);
SnapshotEnsembles::Policy<TestType, TestType> p(snapshotEnsembles);
snapshotEnsembles.EpochBatches() = 10 / (double)1000;
// Create all restart epochs.
arma::Col<size_t> nextRestart(1000 / 10 / mult);
nextRestart(0) = restart;
for (size_t j = 1; j < nextRestart.n_elem; ++j)
nextRestart(j) = nextRestart(j - 1) * mult;
for (size_t i = 0; i < 1000; ++i)
{
p.Update(iterate, epochStepSize, iterate);
if (i <= restart || arma::accu(arma::find(nextRestart == i)) > 0)
{
REQUIRE(epochStepSize == stepSize);
}
}
REQUIRE(p.Snapshots().size() == 2);
}
}
}
TEMPLATE_TEST_CASE("SnapshotSGDR_LogisticRegressionFunction", "[SnapshotSGDR]",
ENS_ALL_TEST_TYPES)
{
// Run SGDR with snapshot ensembles on a couple of batch sizes.
for (size_t batchSize = 10; batchSize < 50; batchSize += 10)
{
SnapshotSGDR<> sgdr(50, 2.0, batchSize, 0.005 * batchSize, 10000, 1e-3);
LogisticRegressionFunctionTest<TestType, arma::Row<size_t>>(sgdr);
}
}
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