cxx11_tensor_striding.cpp File Reference

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

Functions
template<int DataLayout>
static void	test_simple_striding ()
template<int DataLayout>
static void	test_striding_as_lvalue ()
	EIGEN_DECLARE_TEST (cxx11_tensor_striding)

Function Documentation

EIGEN_DECLARE_TEST()

EIGEN_DECLARE_TEST

(

cxx11_tensor_striding

)

                                          {
  CALL_SUBTEST(test_simple_striding<ColMajor>());
  CALL_SUBTEST(test_simple_striding<RowMajor>());
  CALL_SUBTEST(test_striding_as_lvalue<ColMajor>());
  CALL_SUBTEST(test_striding_as_lvalue<RowMajor>());
}

References CALL_SUBTEST.

test_simple_striding()

template<int DataLayout>

static void test_simple_striding ( )

static

                                   {
  Tensor<float, 4, DataLayout> tensor(2, 3, 5, 7);
  tensor.setRandom();
  array<ptrdiff_t, 4> strides;
  strides[0] = 1;
  strides[1] = 1;
  strides[2] = 1;
  strides[3] = 1;
 
  Tensor<float, 4, DataLayout> no_stride;
  no_stride = tensor.stride(strides);
 
  VERIFY_IS_EQUAL(no_stride.dimension(0), 2);
  VERIFY_IS_EQUAL(no_stride.dimension(1), 3);
  VERIFY_IS_EQUAL(no_stride.dimension(2), 5);
  VERIFY_IS_EQUAL(no_stride.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), no_stride(i, j, k, l));
        }
      }
    }
  }
 
  strides[0] = 2;
  strides[1] = 4;
  strides[2] = 2;
  strides[3] = 3;
  Tensor<float, 4, DataLayout> stride;
  stride = tensor.stride(strides);
 
  VERIFY_IS_EQUAL(stride.dimension(0), 1);
  VERIFY_IS_EQUAL(stride.dimension(1), 1);
  VERIFY_IS_EQUAL(stride.dimension(2), 3);
  VERIFY_IS_EQUAL(stride.dimension(3), 3);
 
  for (int i = 0; i < 1; ++i) {
    for (int j = 0; j < 1; ++j) {
      for (int k = 0; k < 3; ++k) {
        for (int l = 0; l < 3; ++l) {
          VERIFY_IS_EQUAL(tensor(2 * i, 4 * j, 2 * k, 3 * l), stride(i, j, k, l));
        }
      }
    }
  }
}

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

test_striding_as_lvalue()

template<int DataLayout>

static void test_striding_as_lvalue ( )

static

                                      {
  Tensor<float, 4, DataLayout> tensor(2, 3, 5, 7);
  tensor.setRandom();
  array<ptrdiff_t, 4> strides;
  strides[0] = 2;
  strides[1] = 4;
  strides[2] = 2;
  strides[3] = 3;
 
  Tensor<float, 4, DataLayout> result(3, 12, 10, 21);
  result.stride(strides) = tensor;
 
  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), result(2 * i, 4 * j, 2 * k, 3 * l));
        }
      }
    }
  }
 
  array<ptrdiff_t, 4> no_strides;
  no_strides[0] = 1;
  no_strides[1] = 1;
  no_strides[2] = 1;
  no_strides[3] = 1;
  Tensor<float, 4, DataLayout> result2(3, 12, 10, 21);
  result2.stride(strides) = tensor.stride(no_strides);
 
  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), result2(2 * i, 4 * j, 2 * k, 3 * l));
        }
      }
    }
  }
}

References i, j, k, Eigen::TensorBase< Derived, AccessLevel >::setRandom(), Eigen::TensorBase< Derived, AccessLevel >::stride(), Eigen::internal::strides(), and VERIFY_IS_EQUAL.