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//---------------------------------------------------------------------------//
// Copyright (c) 2014 Roshan <thisisroshansmail@gmail.com>
//
// Distributed under the Boost Software License, Version 1.0
// See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt
//
// See http://boostorg.github.com/compute for more information.
//---------------------------------------------------------------------------//
#define BOOST_TEST_MODULE TestDiscreteDistribution
#include <boost/test/unit_test.hpp>
#include <vector>
#include <boost/compute/system.hpp>
#include <boost/compute/command_queue.hpp>
#include <boost/compute/algorithm/count_if.hpp>
#include <boost/compute/container/vector.hpp>
#include <boost/compute/random/default_random_engine.hpp>
#include <boost/compute/random/discrete_distribution.hpp>
#include <boost/compute/lambda.hpp>
#include "context_setup.hpp"
BOOST_AUTO_TEST_CASE(discrete_distribution_doctest)
{
using boost::compute::uint_;
using boost::compute::lambda::_1;
boost::compute::vector<uint_> vec(100, context);
//! [generate]
// initialize the default random engine
boost::compute::default_random_engine engine(queue);
// initialize weights
int weights[] = {2, 2};
// setup the discrete distribution to produce integers 0 and 1
// with equal weights
boost::compute::discrete_distribution<uint_> distribution(weights, weights+2);
// generate the random values and store them to 'vec'
distribution.generate(vec.begin(), vec.end(), engine, queue);
// ! [generate]
BOOST_CHECK_EQUAL(
boost::compute::count_if(
vec.begin(), vec.end(), _1 > 1, queue
),
size_t(0)
);
}
BOOST_AUTO_TEST_CASE(discrete_distribution)
{
using boost::compute::uint_;
using boost::compute::lambda::_1;
size_t size = 100;
boost::compute::vector<uint_> vec(size, context);
// initialize the default random engine
boost::compute::default_random_engine engine(queue);
// initialize weights
int weights[] = {10, 40, 40, 10};
// setup the discrete distribution
boost::compute::discrete_distribution<uint_> distribution(
weights, weights + 4
);
std::vector<double> p = distribution.probabilities();
BOOST_CHECK_CLOSE(p[0], double(0.1), 0.001);
BOOST_CHECK_CLOSE(p[1], double(0.4), 0.001);
BOOST_CHECK_CLOSE(p[2], double(0.4), 0.001);
BOOST_CHECK_CLOSE(p[3], double(0.1), 0.001);
BOOST_CHECK_EQUAL((distribution.min)(), uint_(0));
BOOST_CHECK_EQUAL((distribution.max)(), uint_(3));
// generate the random values and store them to 'vec'
distribution.generate(vec.begin(), vec.end(), engine, queue);
BOOST_CHECK_EQUAL(
boost::compute::count_if(
vec.begin(), vec.end(), _1 < 4, queue
),
size
);
}
BOOST_AUTO_TEST_CASE(discrete_distribution_default_ctor)
{
using boost::compute::uint_;
using boost::compute::lambda::_1;
size_t size = 100;
boost::compute::vector<uint_> vec(size, context);
// initialize the default random engine
boost::compute::default_random_engine engine(queue);
// call default constructor
boost::compute::discrete_distribution<uint_> distribution;
std::vector<double> p = distribution.probabilities();
BOOST_CHECK_CLOSE(p[0], double(1), 0.001);
// generate the random values and store them to 'vec'
distribution.generate(vec.begin(), vec.end(), engine, queue);
BOOST_CHECK_EQUAL(
boost::compute::count_if(
vec.begin(), vec.end(), _1 == 0, queue
),
size
);
}
BOOST_AUTO_TEST_CASE(discrete_distribution_one_weight)
{
using boost::compute::uint_;
using boost::compute::lambda::_1;
size_t size = 100;
boost::compute::vector<uint_> vec(size, context);
// initialize the default random engine
boost::compute::default_random_engine engine(queue);
std::vector<int> weights(1, 1);
// call default constructor
boost::compute::discrete_distribution<uint_> distribution(
weights.begin(), weights.end()
);
std::vector<double> p = distribution.probabilities();
BOOST_CHECK_CLOSE(p[0], double(1), 0.001);
BOOST_CHECK_EQUAL((distribution.min)(), uint_(0));
BOOST_CHECK_EQUAL((distribution.max)(), uint_(0));
// generate the random values and store them to 'vec'
distribution.generate(vec.begin(), vec.end(), engine, queue);
BOOST_CHECK_EQUAL(
boost::compute::count_if(
vec.begin(), vec.end(), _1 == 0, queue
),
size
);
}
BOOST_AUTO_TEST_CASE(discrete_distribution_empty_weights)
{
using boost::compute::uint_;
using boost::compute::lambda::_1;
size_t size = 100;
boost::compute::vector<uint_> vec(size, context);
// initialize the default random engine
boost::compute::default_random_engine engine(queue);
std::vector<int> weights;
// weights.begin() == weights.end()
boost::compute::discrete_distribution<uint_> distribution(
weights.begin(), weights.end()
);
std::vector<double> p = distribution.probabilities();
BOOST_CHECK_CLOSE(p[0], double(1), 0.001);
BOOST_CHECK_EQUAL((distribution.min)(), uint_(0));
BOOST_CHECK_EQUAL((distribution.max)(), uint_(0));
// generate the random values and store them to 'vec'
distribution.generate(vec.begin(), vec.end(), engine, queue);
BOOST_CHECK_EQUAL(
boost::compute::count_if(
vec.begin(), vec.end(), _1 == 0, queue
),
size
);
}
BOOST_AUTO_TEST_CASE(discrete_distribution_uchar)
{
using boost::compute::uchar_;
using boost::compute::uint_;
using boost::compute::lambda::_1;
size_t size = 100;
boost::compute::vector<uchar_> uchar_vec(size, context);
boost::compute::vector<uint_> uint_vec(size, context);
// initialize the default random engine
boost::compute::default_random_engine engine(queue);
// initialize weights
std::vector<int> weights(258, 0);
weights[257] = 1;
// setup the discrete distribution
boost::compute::discrete_distribution<uchar_> distribution(
weights.begin(), weights.end()
);
BOOST_CHECK_EQUAL((distribution.min)(), uchar_(0));
BOOST_CHECK_EQUAL((distribution.max)(), uchar_(255));
// generate the random uchar_ values to the uchar_ vector
distribution.generate(uchar_vec.begin(), uchar_vec.end(), engine, queue);
BOOST_CHECK_EQUAL(
boost::compute::count_if(
uchar_vec.begin(), uchar_vec.end(), _1 == uchar_(1), queue
),
size
);
// generate the random uchar_ values to the uint_ vector
distribution.generate(uint_vec.begin(), uint_vec.end(), engine, queue);
BOOST_CHECK_EQUAL(
boost::compute::count_if(
uint_vec.begin(), uint_vec.end(), _1 == uint_(1), queue
),
size
);
}
BOOST_AUTO_TEST_SUITE_END()
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