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+/* Copyright 2018 The TensorFlow Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+
+#include "tensorflow/cc/client/client_session.h"
+#include "tensorflow/cc/framework/grad_op_registry.h"
+#include "tensorflow/cc/framework/gradient_checker.h"
+#include "tensorflow/cc/framework/testutil.h"
+#include "tensorflow/cc/gradients/grad_testutil.h"
+#include "tensorflow/cc/ops/image_ops_internal.h"
+#include "tensorflow/cc/ops/standard_ops.h"
+#include "tensorflow/core/framework/tensor_testutil.h"
+#include "tensorflow/core/lib/core/status_test_util.h"
+
+namespace tensorflow {
+namespace {
+
+using ops::Const;
+using ops::ResizeBilinear;
+using ops::ResizeBicubic;
+using ops::ResizeNearestNeighbor;
+
+class ImageGradTest : public ::testing::Test {
+ protected:
+ ImageGradTest() : scope_(Scope::NewRootScope()) {}
+
+ enum OpType { RESIZE_NEAREST, RESIZE_BILINEAR, RESIZE_BICUBIC };
+
+ template <typename T>
+ Tensor MakeData(TensorShape& data_shape) {
+ DataType data_type = DataTypeToEnum<T>::v();
+ Tensor data(data_type, data_shape);
+ auto data_flat = data.flat<T>();
+ for (int i = 0; i < data_flat.size(); ++i) {
+ data_flat(i) = T(i);
+ }
+ return data;
+ }
+
+ template <typename T>
+ void MakeOp(const OpType op_type, const Tensor& x_data, const Input& y_shape,
+ const bool align_corners, Output* x, Output* y) {
+ *x = Const<T>(scope_, x_data);
+ switch (op_type) {
+ case RESIZE_NEAREST:
+ *y = ResizeNearestNeighbor(
+ scope_, *x, y_shape,
+ ResizeNearestNeighbor::AlignCorners(align_corners));
+ break;
+ case RESIZE_BILINEAR:
+ *y = ResizeBilinear(scope_, *x, y_shape,
+ ResizeBilinear::AlignCorners(align_corners));
+ break;
+ case RESIZE_BICUBIC:
+ *y = ResizeBicubic(scope_, *x, y_shape,
+ ResizeBicubic::AlignCorners(align_corners));
+ break;
+ }
+ assert(false);
+ }
+
+ template <typename T>
+ void TestResizedShapeForType(const OpType op_type, const bool align_corners) {
+ TensorShape x_shape({1, 2, 2, 1});
+ Tensor x_data = MakeData<T>(x_shape);
+ Output x, y;
+ MakeOp<T>(op_type, x_data, {4, 6}, align_corners, &x, &y);
+
+ ClientSession session(scope_);
+ std::vector<Tensor> outputs;
+ TF_ASSERT_OK(session.Run({}, {y}, &outputs));
+ EXPECT_EQ(outputs.size(), 1);
+ EXPECT_EQ(outputs[0].shape(), TensorShape({1, 4, 6, 1}));
+ }
+
+ void TestResizedShape(OpType op_type) {
+ for (const bool align_corners : {true, false}) {
+ TestResizedShapeForType<Eigen::half>(op_type, align_corners);
+ TestResizedShapeForType<float>(op_type, align_corners);
+ TestResizedShapeForType<double>(op_type, align_corners);
+ }
+ }
+
+ template <typename X_T, typename Y_T, typename JAC_T>
+ void TestResizeToSmallerAndAlign(const OpType op_type,
+ const bool align_corners) {
+ TensorShape x_shape({1, 4, 6, 1});
+ Tensor x_data = MakeData<X_T>(x_shape);
+ Output x, y;
+ MakeOp<X_T>(op_type, x_data, {2, 3}, align_corners, &x, &y);
+ JAC_T max_error;
+ TF_ASSERT_OK((ComputeGradientError<X_T, Y_T, JAC_T>(
+ scope_, x, x_data, y, {1, 2, 3, 1}, &max_error)));
+ EXPECT_LT(max_error, 1e-3);
+ }
+
+ template <typename X_T, typename Y_T, typename JAC_T>
+ void TestResizeToLargerAndAlign(const OpType op_type,
+ const bool align_corners) {
+ TensorShape x_shape({1, 2, 3, 1});
+ Tensor x_data = MakeData<X_T>(x_shape);
+ Output x, y;
+ MakeOp<X_T>(op_type, x_data, {4, 6}, align_corners, &x, &y);
+ JAC_T max_error;
+ TF_ASSERT_OK((ComputeGradientError<X_T, Y_T, JAC_T>(
+ scope_, x, x_data, y, {1, 4, 6, 1}, &max_error)));
+ EXPECT_LT(max_error, 1e-3);
+ }
+
+ template <typename X_T, typename Y_T, typename JAC_T>
+ void TestResize(OpType op_type) {
+ for (const bool align_corners : {true, false}) {
+ TestResizeToSmallerAndAlign<X_T, Y_T, JAC_T>(op_type, align_corners);
+ TestResizeToLargerAndAlign<X_T, Y_T, JAC_T>(op_type, align_corners);
+ }
+ }
+
+ Scope scope_;
+};
+
+TEST_F(ImageGradTest, TestNearestNeighbor) {
+ TestResizedShape(RESIZE_NEAREST);
+ TestResize<float, float, float>(RESIZE_NEAREST);
+ TestResize<double, double, double>(RESIZE_NEAREST);
+}
+
+TEST_F(ImageGradTest, TestBilinear) {
+ TestResizedShape(RESIZE_BILINEAR);
+ TestResize<float, float, float>(RESIZE_BILINEAR);
+ // Note that Y_T is always float for this op. We choose
+ // double for the jacobian to capture the higher precision
+ // between X_T and Y_T.
+ TestResize<double, float, double>(RESIZE_BILINEAR);
+}
+
+TEST_F(ImageGradTest, TestBicubic) {
+ TestResizedShape(RESIZE_BICUBIC);
+ TestResize<float, float, float>(RESIZE_BICUBIC);
+ // Note that Y_T is always float for this op. We choose
+ // double for the jacobian to capture the higher precision
+ // between X_T and Y_T.
+ TestResize<double, float, double>(RESIZE_BICUBIC);
+}
+
+} // namespace
+} // namespace tensorflow