cxx11_tensor_reverse.cpp File Reference

#include "main.h"
#include <Eigen/CXX11/Tensor>

Functions
template<int DataLayout>
static void	test_simple_reverse ()
template<int DataLayout>
static void	test_expr_reverse (bool LValue)
	EIGEN_DECLARE_TEST (cxx11_tensor_reverse)

Function Documentation

EIGEN_DECLARE_TEST()

EIGEN_DECLARE_TEST

(

cxx11_tensor_reverse

)

                                         {
  CALL_SUBTEST(test_simple_reverse<ColMajor>());
  CALL_SUBTEST(test_simple_reverse<RowMajor>());
  CALL_SUBTEST(test_expr_reverse<ColMajor>(true));
  CALL_SUBTEST(test_expr_reverse<RowMajor>(true));
  CALL_SUBTEST(test_expr_reverse<ColMajor>(false));
  CALL_SUBTEST(test_expr_reverse<RowMajor>(false));
}

References CALL_SUBTEST.

test_expr_reverse()

template<int DataLayout>

static void test_expr_reverse ( bool  LValue )

static

                                           {
  Tensor<float, 4, DataLayout> tensor(2, 3, 5, 7);
  tensor.setRandom();
 
  array<bool, 4> dim_rev;
  dim_rev[0] = false;
  dim_rev[1] = true;
  dim_rev[2] = false;
  dim_rev[3] = true;
 
  Tensor<float, 4, DataLayout> expected(2, 3, 5, 7);
  if (LValue) {
    expected.reverse(dim_rev) = tensor;
  } else {
    expected = tensor.reverse(dim_rev);
  }
 
  Tensor<float, 4, DataLayout> result(2, 3, 5, 7);
 
  array<ptrdiff_t, 4> src_slice_dim;
  src_slice_dim[0] = 2;
  src_slice_dim[1] = 3;
  src_slice_dim[2] = 1;
  src_slice_dim[3] = 7;
  array<ptrdiff_t, 4> src_slice_start;
  src_slice_start[0] = 0;
  src_slice_start[1] = 0;
  src_slice_start[2] = 0;
  src_slice_start[3] = 0;
  array<ptrdiff_t, 4> dst_slice_dim = src_slice_dim;
  array<ptrdiff_t, 4> dst_slice_start = src_slice_start;
 
  for (int i = 0; i < 5; ++i) {
    if (LValue) {
      result.slice(dst_slice_start, dst_slice_dim).reverse(dim_rev) = tensor.slice(src_slice_start, src_slice_dim);
    } else {
      result.slice(dst_slice_start, dst_slice_dim) = tensor.slice(src_slice_start, src_slice_dim).reverse(dim_rev);
    }
    src_slice_start[2] += 1;
    dst_slice_start[2] += 1;
  }
 
  VERIFY_IS_EQUAL(result.dimension(0), 2);
  VERIFY_IS_EQUAL(result.dimension(1), 3);
  VERIFY_IS_EQUAL(result.dimension(2), 5);
  VERIFY_IS_EQUAL(result.dimension(3), 7);
 
  for (int i = 0; i < expected.dimension(0); ++i) {
    for (int j = 0; j < expected.dimension(1); ++j) {
      for (int k = 0; k < expected.dimension(2); ++k) {
        for (int l = 0; l < expected.dimension(3); ++l) {
          VERIFY_IS_EQUAL(result(i, j, k, l), expected(i, j, k, l));
        }
      }
    }
  }
 
  dst_slice_start[2] = 0;
  result.setRandom();
  for (int i = 0; i < 5; ++i) {
    if (LValue) {
      result.slice(dst_slice_start, dst_slice_dim).reverse(dim_rev) = tensor.slice(dst_slice_start, dst_slice_dim);
    } else {
      result.slice(dst_slice_start, dst_slice_dim) = tensor.reverse(dim_rev).slice(dst_slice_start, dst_slice_dim);
    }
    dst_slice_start[2] += 1;
  }
 
  for (int i = 0; i < expected.dimension(0); ++i) {
    for (int j = 0; j < expected.dimension(1); ++j) {
      for (int k = 0; k < expected.dimension(2); ++k) {
        for (int l = 0; l < expected.dimension(3); ++l) {
          VERIFY_IS_EQUAL(result(i, j, k, l), expected(i, j, k, l));
        }
      }
    }
  }
}

References Eigen::Tensor< Scalar_, NumIndices_, Options_, IndexType_ >::dimension(), i, j, k, Eigen::TensorBase< Derived, AccessLevel >::reverse(), Eigen::TensorBase< Derived, AccessLevel >::setRandom(), Eigen::TensorBase< Derived, AccessLevel >::slice(), and VERIFY_IS_EQUAL.

test_simple_reverse()

template<int DataLayout>

static void test_simple_reverse ( )

static

                                  {
  Tensor<float, 4, DataLayout> tensor(2, 3, 5, 7);
  tensor.setRandom();
 
  array<bool, 4> dim_rev;
  dim_rev[0] = false;
  dim_rev[1] = true;
  dim_rev[2] = true;
  dim_rev[3] = false;
 
  Tensor<float, 4, DataLayout> reversed_tensor;
  reversed_tensor = tensor.reverse(dim_rev);
 
  VERIFY_IS_EQUAL(reversed_tensor.dimension(0), 2);
  VERIFY_IS_EQUAL(reversed_tensor.dimension(1), 3);
  VERIFY_IS_EQUAL(reversed_tensor.dimension(2), 5);
  VERIFY_IS_EQUAL(reversed_tensor.dimension(3), 7);
 
  for (int i = 0; i < 2; ++i) {
    for (int j = 0; j < 3; ++j) {
      for (int k = 0; k < 5; ++k) {
        for (int l = 0; l < 7; ++l) {
          VERIFY_IS_EQUAL(tensor(i, j, k, l), reversed_tensor(i, 2 - j, 4 - k, l));
        }
      }
    }
  }
 
  dim_rev[0] = true;
  dim_rev[1] = false;
  dim_rev[2] = false;
  dim_rev[3] = false;
 
  reversed_tensor = tensor.reverse(dim_rev);
 
  VERIFY_IS_EQUAL(reversed_tensor.dimension(0), 2);
  VERIFY_IS_EQUAL(reversed_tensor.dimension(1), 3);
  VERIFY_IS_EQUAL(reversed_tensor.dimension(2), 5);
  VERIFY_IS_EQUAL(reversed_tensor.dimension(3), 7);
 
  for (int i = 0; i < 2; ++i) {
    for (int j = 0; j < 3; ++j) {
      for (int k = 0; k < 5; ++k) {
        for (int l = 0; l < 7; ++l) {
          VERIFY_IS_EQUAL(tensor(i, j, k, l), reversed_tensor(1 - i, j, k, l));
        }
      }
    }
  }
 
  dim_rev[0] = true;
  dim_rev[1] = false;
  dim_rev[2] = false;
  dim_rev[3] = true;
 
  reversed_tensor = tensor.reverse(dim_rev);
 
  VERIFY_IS_EQUAL(reversed_tensor.dimension(0), 2);
  VERIFY_IS_EQUAL(reversed_tensor.dimension(1), 3);
  VERIFY_IS_EQUAL(reversed_tensor.dimension(2), 5);
  VERIFY_IS_EQUAL(reversed_tensor.dimension(3), 7);
 
  for (int i = 0; i < 2; ++i) {
    for (int j = 0; j < 3; ++j) {
      for (int k = 0; k < 5; ++k) {
        for (int l = 0; l < 7; ++l) {
          VERIFY_IS_EQUAL(tensor(i, j, k, l), reversed_tensor(1 - i, j, k, 6 - l));
        }
      }
    }
  }
}

References Eigen::Tensor< Scalar_, NumIndices_, Options_, IndexType_ >::dimension(), i, j, k, Eigen::TensorBase< Derived, AccessLevel >::reverse(), Eigen::TensorBase< Derived, AccessLevel >::setRandom(), and VERIFY_IS_EQUAL.