From fede6ca1dd0077ff509d84bd24028cc7a93bb119 Mon Sep 17 00:00:00 2001
From: StevenLiuWen <liuwen@shanghaitech.edu.cn>
Date: Tue, 13 Mar 2018 03:28:06 -0400
Subject: first commit

---
 .../src/ops/downsample/downsample_kernel.cc        | 47 ++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 Codes/flownet2/src/ops/downsample/downsample_kernel.cc

(limited to 'Codes/flownet2/src/ops/downsample/downsample_kernel.cc')

diff --git a/Codes/flownet2/src/ops/downsample/downsample_kernel.cc b/Codes/flownet2/src/ops/downsample/downsample_kernel.cc
new file mode 100644
index 0000000..eefe247
--- /dev/null
+++ b/Codes/flownet2/src/ops/downsample/downsample_kernel.cc
@@ -0,0 +1,47 @@
+#define EIGEN_USE_THREADS
+
+#include "downsample_kernel.h"
+#include "tensorflow/core/framework/op_kernel.h"
+#include "tensorflow/core/framework/register_types.h"
+#include "tensorflow/core/framework/types.h"
+#include "tensorflow/core/platform/types.h"
+
+namespace tensorflow {
+
+typedef Eigen::GpuDevice GPUDevice;
+
+template <typename Device>
+class DownsampleKernel : public OpKernel {
+ public:
+  explicit DownsampleKernel(OpKernelConstruction* ctx) : OpKernel(ctx) {
+    // Get the size [height, width] tensor and verify its dimensions
+    OP_REQUIRES_OK(ctx, ctx->GetAttr("size", &size_));
+    OP_REQUIRES(ctx, size_.size() == 2, errors::InvalidArgument("size must be 2 dimensions"));
+  }
+
+  void Compute(OpKernelContext* ctx) override {
+    // Get the input images and transforms and verify their dimensions
+    const Tensor& input_t = ctx->input(0);
+    OP_REQUIRES(ctx, input_t.dims() == 4,
+                errors::InvalidArgument("Input images must have rank 4"));
+
+    // Allocate the memory for the output
+    Tensor* output_t;
+    OP_REQUIRES_OK(ctx, ctx->allocate_output(
+        0, TensorShape({input_t.dim_size(0), size_[0], size_[1], input_t.dim_size(3)}), &output_t));
+
+    // Perform flow augmentation
+    auto input = input_t.tensor<float, 4>();
+    auto output = output_t->tensor<float, 4>();
+
+    Downsample(ctx->eigen_gpu_device(), input, output);
+  }
+
+  private:
+    std::vector<int32> size_;
+};
+
+REGISTER_KERNEL_BUILDER(Name("Downsample")
+                          .Device(DEVICE_GPU),
+                      DownsampleKernel<GPUDevice>)
+}  // end namespace tensorflow
-- 
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