Added support for patch extraction

1 files changed, 103 insertions, 0 deletions

diff --git a/unsupported/test/cxx11_tensor_patch.cpp b/unsupported/test/cxx11_tensor_patch.cpp
new file mode 100644
index 000000000..e2ba5bfd8
--- /dev/null
+++ b/unsupported/test/cxx11_tensor_patch.cpp
@@ -0,0 +1,103 @@
+// This file is part of Eigen, a lightweight C++ template library
+// for linear algebra.
+//
+// Copyright (C) 2014 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;
+
+static void test_simple_patch()
+{
+  Tensor<float, 4> tensor(2,3,5,7);
+  tensor.setRandom();
+  array<ptrdiff_t, 4> patch_dims;
+  patch_dims[0] = 1;
+  patch_dims[1] = 1;
+  patch_dims[2] = 1;
+  patch_dims[3] = 1;
+
+  Tensor<float, 5> no_patch;
+  no_patch = tensor.extract_patches(patch_dims);
+
+  VERIFY_IS_EQUAL(no_patch.dimension(0), 1);
+  VERIFY_IS_EQUAL(no_patch.dimension(1), 1);
+  VERIFY_IS_EQUAL(no_patch.dimension(2), 1);
+  VERIFY_IS_EQUAL(no_patch.dimension(3), 1);
+  VERIFY_IS_EQUAL(no_patch.dimension(4), tensor.size());
+
+  for (int i = 0; i < tensor.size(); ++i) {
+    VERIFY_IS_EQUAL(tensor.data()[i], no_patch.data()[i]);
+  }
+
+  patch_dims[0] = 1;
+  patch_dims[1] = 2;
+  patch_dims[2] = 2;
+  patch_dims[3] = 1;
+  Tensor<float, 5> twod_patch;
+  twod_patch = tensor.extract_patches(patch_dims);
+
+  VERIFY_IS_EQUAL(twod_patch.dimension(0), 1);
+  VERIFY_IS_EQUAL(twod_patch.dimension(1), 2);
+  VERIFY_IS_EQUAL(twod_patch.dimension(2), 2);
+  VERIFY_IS_EQUAL(twod_patch.dimension(3), 1);
+  VERIFY_IS_EQUAL(twod_patch.dimension(4), 2*2*4*7);
+
+  for (int i = 0; i < 2; ++i) {
+    for (int j = 0; j < 2; ++j) {
+      for (int k = 0; k < 4; ++k) {
+        for (int l = 0; l < 7; ++l) {
+          int patch_loc = i + 2 * (j + 2 * (k + 4 * l));
+          for (int x = 0; x < 2; ++x) {
+            for (int y = 0; y < 2; ++y) {
+              VERIFY_IS_EQUAL(tensor(i,j+x,k+y,l), twod_patch(0,x,y,0,patch_loc));
+            }
+          }
+        }
+      }
+    }
+  }
+
+  patch_dims[0] = 1;
+  patch_dims[1] = 2;
+  patch_dims[2] = 3;
+  patch_dims[3] = 5;
+  Tensor<float, 5> threed_patch;
+  threed_patch = tensor.extract_patches(patch_dims);
+
+  VERIFY_IS_EQUAL(threed_patch.dimension(0), 1);
+  VERIFY_IS_EQUAL(threed_patch.dimension(1), 2);
+  VERIFY_IS_EQUAL(threed_patch.dimension(2), 3);
+  VERIFY_IS_EQUAL(threed_patch.dimension(3), 5);
+  VERIFY_IS_EQUAL(threed_patch.dimension(4), 2*2*3*3);
+
+  for (int i = 0; i < 2; ++i) {
+    for (int j = 0; j < 2; ++j) {
+      for (int k = 0; k < 3; ++k) {
+        for (int l = 0; l < 3; ++l) {
+          int patch_loc = i + 2 * (j + 2 * (k + 3 * l));
+          for (int x = 0; x < 2; ++x) {
+            for (int y = 0; y < 3; ++y) {
+              for (int z = 0; z < 5; ++z) {
+                VERIFY_IS_EQUAL(tensor(i,j+x,k+y,l+z), threed_patch(0,x,y,z,patch_loc));
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+}
+
+
+void test_cxx11_tensor_patch()
+{
+   CALL_SUBTEST(test_simple_patch());
+   //   CALL_SUBTEST(test_expr_shuffling());
+}