text: // 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>
  
  using Eigen::Tensor;
  using Eigen::RowMajor;
  
  static void test_tanh()
  {
    Tensor<float, 1> vec1({6});
    vec1.setRandom();
  
    Tensor<float, 1> vec2 = vec1.tanh();
  
    for (int i = 0; i < 6; ++i) {
      VERIFY_IS_APPROX(vec2(i), tanhf(vec1(i)));
    }
  }
  
  static void test_sigmoid()
  {
    Tensor<float, 1> vec1({6});
    vec1.setRandom();
  
    Tensor<float, 1> vec2 = vec1.sigmoid();
  
    for (int i = 0; i < 6; ++i) {
      VERIFY_IS_APPROX(vec2(i), 1.0f / (1.0f + std::exp(-vec1(i))));
    }
  }
  
  
  void test_cxx11_tensor_math()
  {
    CALL_SUBTEST(test_tanh());
    CALL_SUBTEST(test_sigmoid());
  }
  