Added support for sigmoid function to the tensor module

2 files changed, 47 insertions, 0 deletions

diff --git a/unsupported/test/CMakeLists.txt b/unsupported/test/CMakeLists.txt
index 14f524769..7683e5f9b 100644
--- a/unsupported/test/CMakeLists.txt
+++ b/unsupported/test/CMakeLists.txt
@@ -109,6 +109,7 @@ if(EIGEN_TEST_CXX11)
   ei_add_test(cxx11_tensor_contraction "-std=c++0x")
   ei_add_test(cxx11_tensor_convolution "-std=c++0x")
   ei_add_test(cxx11_tensor_expr "-std=c++0x")
+  ei_add_test(cxx11_tensor_math "-std=c++0x")
   ei_add_test(cxx11_tensor_forced_eval "-std=c++0x")
   ei_add_test(cxx11_tensor_fixed_size "-std=c++0x")
   ei_add_test(cxx11_tensor_const "-std=c++0x")
diff --git a/unsupported/test/cxx11_tensor_math.cpp b/unsupported/test/cxx11_tensor_math.cpp
new file mode 100644
index 000000000..d247bebaa
--- /dev/null
+++ b/unsupported/test/cxx11_tensor_math.cpp
@@ -0,0 +1,46 @@
+// 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());
+}