Quelle cxx11_tensor_generator.cpp Sprache: C

// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2015 Benoit Steiner <benoit.steiner.goog@gmail.com>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.

#include "main.h"

#include <Eigen/CXX11/Tensor>

struct Generator1D {
  Generator1D() { }

  float operator()(const array<Eigen::DenseIndex, 1>& coordinates) const {
    return coordinates[0];
  }
};

template <int DataLayout>
static void test_1D()
{
  Tensor<float, 1> vec(6);
  Tensor<float, 1> result = vec.generate(Generator1D());

  for (int i = 0; i < 6; ++i) {
    VERIFY_IS_EQUAL(result(i), i);
  }
}

struct Generator2D {
  Generator2D() { }

  float operator()(const array<Eigen::DenseIndex, 2>& coordinates) const {
    return 3 * coordinates[0] + 11 * coordinates[1];
  }
};

template <int DataLayout>
static void test_2D()
{
  Tensor<float, 2> matrix(512, 512);
  Tensor<float, 2> result = matrix.generate(Generator2D());

  for (int i = 0; i < 512; ++i) {
    for (int j = 0; j < 512; ++j) {
      VERIFY_IS_EQUAL(result(i, j), 3*i + 11*j);
    }
  }
}

template <int DataLayout>
static void test_gaussian()
{
  int rows = 32;
  int cols = 48;
  array<float, 2> means;
  means[0] = rows / 2.0f;
  means[1] = cols / 2.0f;
  array<float, 2> std_devs;
  std_devs[0] = 3.14f;
  std_devs[1] = 2.7f;
  internal::GaussianGenerator<float, Eigen::DenseIndex, 2> gaussian_gen(means, std_devs);

  Tensor<float, 2> matrix(rows, cols);
  Tensor<float, 2> result = matrix.generate(gaussian_gen);

  for (int i = 0; i < rows; ++i) {
    for (int j = 0; j < cols; ++j) {
      float g_rows = powf(rows/2.0f - i, 2) / (3.14f * 3.14f) * 0.5f;
      float g_cols = powf(cols/2.0f - j, 2) / (2.7f * 2.7f) * 0.5f;
      float gaussian = expf(-g_rows - g_cols);
      VERIFY_IS_EQUAL(result(i, j), gaussian);
    }
  }
}

EIGEN_DECLARE_TEST(cxx11_tensor_generator)
{
  CALL_SUBTEST(test_1D<ColMajor>());
  CALL_SUBTEST(test_1D<RowMajor>());
  CALL_SUBTEST(test_2D<ColMajor>());
  CALL_SUBTEST(test_2D<RowMajor>());
  CALL_SUBTEST(test_gaussian<ColMajor>());
  CALL_SUBTEST(test_gaussian<RowMajor>());
}

quality80%

¤ Dauer der Verarbeitung: 0.10 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.