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/* Copyright 2015 Google Inc. 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.
==============================================================================*/
// See docs in ../ops/image_ops.cc
#define EIGEN_USE_THREADS
#include <memory>
#include "third_party/eigen3/unsupported/Eigen/CXX11/Tensor"
#include "tensorflow/core/framework/op_kernel.h"
#include "tensorflow/core/framework/register_types.h"
#include "tensorflow/core/framework/types.h"
#include "tensorflow/core/platform/logging.h"
#include "tensorflow/core/public/status.h"
#include "tensorflow/core/public/tensor.h"
#include "tensorflow/core/public/tensor_shape.h"
namespace tensorflow {
typedef Eigen::ThreadPoolDevice CPUDevice;
template <typename Device, typename T>
class ResizeNearestNeighborOp : public OpKernel {
public:
explicit ResizeNearestNeighborOp(OpKernelConstruction* context)
: OpKernel(context) {}
void Compute(OpKernelContext* context) override {
const Tensor& input = context->input(0);
OP_REQUIRES(context, input.dims() == 4,
errors::InvalidArgument("input must be 4-dimensional",
input.shape().ShortDebugString()));
const Tensor& shape_t = context->input(1);
OP_REQUIRES(context, shape_t.dims() == 1,
errors::InvalidArgument("shape_t must be 1-dimensional",
shape_t.shape().ShortDebugString()));
OP_REQUIRES(context, shape_t.NumElements() == 2,
errors::InvalidArgument("shape_t must have two elements",
shape_t.shape().ShortDebugString()));
auto Svec = shape_t.vec<int32>();
// Initialize shape to the batch size of the input, then add
// the rest of the dimensions
Tensor* output = nullptr;
OP_REQUIRES_OK(context, context->allocate_output(
0, TensorShape({input.dim_size(0), Svec(0),
Svec(1), input.dim_size(3)}),
&output));
const int64 batch_size = input.dim_size(0);
const int64 in_height = input.dim_size(1);
const int64 in_width = input.dim_size(2);
const int64 channels = input.dim_size(3);
const int64 out_height = output->dim_size(1);
const int64 out_width = output->dim_size(2);
typename TTypes<T, 4>::ConstTensor input_data = input.tensor<T, 4>();
typename TTypes<T, 4>::Tensor output_data = output->tensor<T, 4>();
const float height_scale = in_height / static_cast<float>(out_height);
const float width_scale = in_width / static_cast<float>(out_width);
for (int b = 0; b < batch_size; ++b) {
for (int y = 0; y < out_height; ++y) {
const int in_y = std::min(static_cast<int64>(floorf(y * height_scale)),
(in_height - 1));
for (int x = 0; x < out_width; ++x) {
const int in_x = std::min(static_cast<int64>(floorf(x * width_scale)),
(in_width - 1));
for (int c = 0; c < channels; ++c) {
output_data(b, y, x, c) = input_data(b, in_y, in_x, c);
}
}
}
}
}
};
#define REGISTER_KERNEL(T) \
REGISTER_KERNEL_BUILDER(Name("ResizeNearestNeighbor") \
.Device(DEVICE_CPU) \
.TypeConstraint<T>("T") \
.HostMemory("size"), \
ResizeNearestNeighborOp<CPUDevice, T>);
REGISTER_KERNEL(uint8);
REGISTER_KERNEL(int8);
REGISTER_KERNEL(int32);
REGISTER_KERNEL(float);
REGISTER_KERNEL(double);
#undef REGISTER_KERNEL
} // namespace tensorflow
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