PointIsolationAlg_test.cc File Reference

Unit tests for PointIsolationAlg. More...

#include "larexamples/Algorithms/RemoveIsolatedSpacePoints/PointIsolationAlg.h"
#include "cetlib/pow.h"
#include "boost/test/unit_test.hpp"
#include <array>
#include <algorithm>
#include <numeric>

Go to the source code of this file.

Macros
#define	BOOST_TEST_MODULE   ( PointIsolationAlg_test )

Functions
void	PointIsolationTest1 ()
	Low-multiplicity unit test. More...
template<typename T >
auto	CreateStarOfPoints (unsigned int nShells, T distance=T(1)) -> decltype(auto)
	Creates a "star" disposition of points. More...
void	PointIsolationTest2 (unsigned int levels)
	Tests various isolation radii on a star-distributed set of points. More...
	BOOST_AUTO_TEST_CASE (PointIsolationAlgTest)
	BOOST_AUTO_TEST_CASE (PointIsolationAlgVerificationTest)

Detailed Description

Unit tests for PointIsolationAlg.

Author

Gianluca Petrillo (petri.nosp@m.llo@.nosp@m.fnal..nosp@m.gov)

Date

May 27, 2016

See Also

PointIsolationAlg.h

This test sets up point distributions with known isolation features, runs the algorithm with various isolation radius settings and verifies that the results are as expected.

The test is run with no arguments.

Two tests are run:

• PointIsolationTest1: low multiplicity unit tests
• PointIsolationTest2: larger scale test

See the documentation of the two functions for more information.

Definition in file PointIsolationAlg_test.cc.

Macro Definition Documentation

#define BOOST_TEST_MODULE   ( PointIsolationAlg_test )

Definition at line 29 of file PointIsolationAlg_test.cc.

Function Documentation

BOOST_AUTO_TEST_CASE

(

PointIsolationAlgTest

)

Definition at line 255 of file PointIsolationAlg_test.cc.

                                            {
  PointIsolationTest1();
} // PointIsolationAlgTest()

BOOST_AUTO_TEST_CASE

(

PointIsolationAlgVerificationTest

)

Definition at line 260 of file PointIsolationAlg_test.cc.

                                                        {
  PointIsolationTest2(5);
} // PointIsolationAlgVerificationTest()

template<typename T >

auto CreateStarOfPoints	(	unsigned int	nShells,
		T	distance = T(1)
	)		-> decltype(auto)

Creates a "star" disposition of points.

Template Parameters

T	type of coordinate being used

Parameters

nShells	number of points on each ray of the star (origin excluded)
distance	distance from the origin of the farthest point

Returns

a collection of points (each a std::array<T, 3>

Points are aligned on a semi-axis, sparser and sparser as they go away from origin. nShell is the number of points beside the origin on each semi-axis. Origin is always included. A sequence is generated for each of the semi-axes (x, y, and z, two directions each). Example for nShells = 5, showing only one axis (that is, two semi-axes):

o               o       o   o o O o o   o       o               o

(points are marked with o, with O being the origin)

The order of the points in the set is:

Definition at line 135 of file PointIsolationAlg_test.cc.

{

  using Coord_t = T;
  using Point_t = std::array<Coord_t, 3U>;

  std::vector<Point_t> points;
  points.reserve(1 + 1 * nShells);

  // fill shell by shell
  while (nShells-- > 0) {
    points.push_back({{  distance,        0.,        0. }});
    points.push_back({{ -distance,        0.,        0. }});
    points.push_back({{        0.,  distance,        0. }});
    points.push_back({{        0., -distance,        0. }});
    points.push_back({{        0.,        0.,  distance }});
    points.push_back({{        0.,        0., -distance }});
    distance /= 2;
  } // while

  // add the origin
  points.push_back({{ 0., 0., 0. }});

  return points;
} // CreateStarOfPoints()

void PointIsolationTest1

(

)

Low-multiplicity unit test.

This tests exercises simple point dispositions: a single point, two points, three points at different distance, and two "pairs" of points. The isolation radius of the test is fixed.

This test uses coordinate type float.

Definition at line 54 of file PointIsolationAlg_test.cc.

                           {

  using Coord_t = float;
  using PointIsolationAlg_t = lar::example::PointIsolationAlg<Coord_t>;

  using Point_t = std::array<Coord_t, 3U>;

  PointIsolationAlg_t::Configuration_t config;
  config.radius2 = cet::square(1.);
  config.rangeX = { -2., +2. };
  config.rangeY = { -2., +2. };
  config.rangeZ = { -2., +2. };

  std::vector<Point_t> points;
  std::vector<size_t> result, expected;

  PointIsolationAlg_t algo(config);

  // first test: a single point
  points.push_back({{ +1., +1., +1. }});
  expected.clear();

  result = algo.removeIsolatedPoints(points);
  std::sort(result.begin(), result.end());
  BOOST_TEST(result == expected, boost::test_tools::per_element());


  // second test: two far points
  points.push_back({{ -1., -1., -1. }});
  expected.clear();

  result = algo.removeIsolatedPoints(points);
  std::sort(result.begin(), result.end());
  BOOST_TEST(result == expected, boost::test_tools::per_element());


  // third test: two close points, another isolated
  points.push_back({{ +0.5, +1.0, +1.0 }});
  expected.insert(expected.end(), { 0U, 2U });
  std::sort(expected.begin(), expected.end());

  result = algo.removeIsolatedPoints(points);
  std::sort(result.begin(), result.end());
  BOOST_TEST(result == expected, boost::test_tools::per_element());


  // fourth test: two close points, another two also close
  points.push_back({{ -0.5, -1.0, -1.0 }});
  expected.insert(expected.end(), { 1U, 3U });
  std::sort(expected.begin(), expected.end());

  result = algo.removeIsolatedPoints(points);
  std::sort(result.begin(), result.end());
  BOOST_TEST(result == expected, boost::test_tools::per_element());

} // PointIsolationTest1()

void PointIsolationTest2

(

unsigned int

levels

)

Tests various isolation radii on a star-distributed set of points.

Parameters

levels

number of shells in the star (0 is only its centre)

The test uses a star-distributed set of points, as produced by CreateStarOfPoints(). This distribution has the characteristic that all the points farther than the isolation radius from the origin are indeed isolated. This makes the prediction of the number of isolated points easier.

This test uses coordinate type double.

Definition at line 177 of file PointIsolationAlg_test.cc.

                                              {

  using Coord_t = double;
  using PointIsolationAlg_t = lar::example::PointIsolationAlg<Coord_t>;

  using Point_t = std::array<Coord_t, 3U>;

  //
  // prepare the input
  //
  constexpr Coord_t starRadius = 1.;
  std::vector<Point_t> points = CreateStarOfPoints<Coord_t>(levels, starRadius);

  //
  // prepare the algorithm
  //
  PointIsolationAlg_t::Configuration_t config;
  config.radius2 = cet::square(1.);
  config.rangeX = { -2., +2. };
  config.rangeY = { -2., +2. };
  config.rangeZ = { -2., +2. };
  PointIsolationAlg_t algo(config);

  //
  // check every level
  //
  constexpr unsigned int nSemiDirections = 6;
  // small step (smaller than smallest distance between shells):
  const Coord_t epsilonStep = starRadius / (2 << levels);
  double baseRadius = starRadius; // starting radius

  // with the wider isolation radius, we expect all the points to be
  // non-isolated; the most isolated points are at the beginning of the list
  size_t const maxExpectedPoints = 1 + levels * nSemiDirections;
  assert(maxExpectedPoints == points.size());

  std::vector<size_t> expectedBase(maxExpectedPoints);
  std::iota(expectedBase.begin(), expectedBase.end(), 0U);

  // check radii that fall in between all the shells;
  // the first radius is a bit more than half the star radius, and it is
  // expected to include all points; the next, a bit more than a fourth of the
  // star radius, will define the 6 points on the outer shell as isolated;
  // and so forth.
  // Level N has a radius that includes N shells plus the origin.
  // Level 0 has a radius so small that it includes only the origin.
  unsigned int level = levels;
  do {

    // compute and set up a proper isolation radius for this level
    baseRadius /= 2.;
    config.radius2 = cet::square(baseRadius + epsilonStep);
    algo.reconfigure(config);

    BOOST_TEST_MESSAGE
      ("[" << level <<"] testing with radius " << (baseRadius + epsilonStep));

    // we expect to progressively have less and less non-isolated points...
    unsigned int const nExpected = (level > 1)? (1 + level * nSemiDirections): 0;
    // ... and we expect those points to be the first ones in the collection
    std::vector<size_t> expected
      (expectedBase.end() - nExpected, expectedBase.end());

    std::vector<size_t> result = algo.removeIsolatedPoints(points);
    BOOST_TEST(result.size() == expected.size());

    std::sort(result.begin(), result.end());
    std::sort(expected.begin(), expected.end());
    BOOST_TEST(result == expected, boost::test_tools::per_element());

  } while (--level > 0);

} // PointIsolationTest2()