random_sampler_test.cc

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// Copyright (c) 2018, ETH Zurich and UNC Chapel Hill.
// All rights reserved.
//
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// modification, are permitted provided that the following conditions are met:
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//     * Redistributions in binary form must reproduce the above copyright
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//     * Neither the name of ETH Zurich and UNC Chapel Hill nor the names of
//       its contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
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// Author: Johannes L. Schoenberger (jsch-at-demuc-dot-de)
 
#define TEST_NAME "optim/random_sampler"
#include "util/testing.h"
 
#include <unordered_set>
 
#include "optim/random_sampler.h"
 
using namespace colmap;
 
BOOST_AUTO_TEST_CASE(TestLessSamples) {
  RandomSampler sampler(2);
  sampler.Initialize(5);
  BOOST_CHECK_EQUAL(sampler.MaxNumSamples(),
                    std::numeric_limits<size_t>::max());
  for (size_t i = 0; i < 100; ++i) {
    const auto samples = sampler.Sample();
    BOOST_CHECK_EQUAL(samples.size(), 2);
    BOOST_CHECK_EQUAL(
        std::unordered_set<size_t>(samples.begin(), samples.end()).size(), 2);
  }
}
 
BOOST_AUTO_TEST_CASE(TestEqualSamples) {
  RandomSampler sampler(5);
  sampler.Initialize(5);
  BOOST_CHECK_EQUAL(sampler.MaxNumSamples(),
                    std::numeric_limits<size_t>::max());
  for (size_t i = 0; i < 100; ++i) {
    const auto samples = sampler.Sample();
    BOOST_CHECK_EQUAL(samples.size(), 5);
    BOOST_CHECK_EQUAL(
        std::unordered_set<size_t>(samples.begin(), samples.end()).size(), 5);
  }
}