From 67ce586453a9637a9474a78e6041158405bdf81c Mon Sep 17 00:00:00 2001
From: wangyang59 <wangyang59@baidu.com>
Date: Wed, 21 Mar 2018 15:10:54 -0700
Subject: [PATCH] gpu implementation of bilinear interp

---
 paddle/fluid/operators/bilinear_interp_op.cu | 95 ++++++++++++++++++++
 paddle/fluid/operators/bilinear_interp_op.h  |  2 +-
 2 files changed, 96 insertions(+), 1 deletion(-)
 create mode 100644 paddle/fluid/operators/bilinear_interp_op.cu

diff --git a/paddle/fluid/operators/bilinear_interp_op.cu b/paddle/fluid/operators/bilinear_interp_op.cu
new file mode 100644
index 00000000000..187ad60f2da
--- /dev/null
+++ b/paddle/fluid/operators/bilinear_interp_op.cu
@@ -0,0 +1,95 @@
+/* Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
+   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 "hl_cnn.h"
+#include "paddle/fluid/operators/bilinear_interp_op.h"
+
+namespace paddle {
+namespace operators {
+
+template <typename T>
+class BilinearInterpOpCUDAKernel : public framework::OpKernel<T> {
+ public:
+  void Compute(const framework::ExecutionContext& ctx) const override {
+    PADDLE_ENFORCE(platform::is_gpu_place(ctx.GetPlace()),
+                   "This kernel only runs on GPU device.");
+    auto* input_t = ctx.Input<Tensor>("X");      // float tensor
+    auto* output_t = ctx.Output<Tensor>("Out");  // float tensor
+    auto* input = input_t->data<T>();
+    auto* output = output_t->mutable_data<T>(ctx.GetPlace());
+
+    int out_h = ctx.Attr<int>("out_h");
+    int out_w = ctx.Attr<int>("out_w");
+    int batch_size = input_t->dims()[0];
+    int channels = input_t->dims()[1];
+    int in_h = input_t->dims()[2];
+    int in_w = input_t->dims()[3];
+
+    int in_hw = in_h * in_w;
+    int out_hw = out_h * out_w;
+    int in_chw = channels * in_hw;
+    int out_chw = channels * out_hw;
+
+    T ratio_h = (out_h > 1) ? static_cast<T>(in_h - 1) / (out_h - 1) : 0.f;
+    T ratio_w = (out_w > 1) ? static_cast<T>(in_w - 1) / (out_w - 1) : 0.f;
+
+    if (in_h == out_h && in_w == out_w) {
+      memcpy(output, input, input_t->numel() * sizeof(T));
+    } else {
+      hl_bilinear_forward(input, in_h, in_w, batch_size, in_chw, output, out_h,
+                          out_w, batch_size, out_chw, channels, ratio_h,
+                          ratio_w);
+    }
+  }
+};
+
+template <typename T>
+class BilinearInterpGradOpCUDAKernel : public framework::OpKernel<T> {
+ public:
+  void Compute(const framework::ExecutionContext& ctx) const override {
+    auto* d_input_t = ctx.Output<Tensor>(framework::GradVarName("X"));
+    auto* d_output_t = ctx.Input<Tensor>(framework::GradVarName("Out"));
+    auto* d_input = d_input_t->mutable_data<T>(ctx.GetPlace());
+    auto* d_output = d_output_t->data<T>();
+
+    int out_h = ctx.Attr<int>("out_h");
+    int out_w = ctx.Attr<int>("out_w");
+    int batch_size = d_input_t->dims()[0];
+    int channels = d_input_t->dims()[1];
+    int in_h = d_input_t->dims()[2];
+    int in_w = d_input_t->dims()[3];
+
+    int in_hw = in_h * in_w;
+    int out_hw = out_h * out_w;
+    int in_chw = channels * in_hw;
+    int out_chw = channels * out_hw;
+
+    T ratio_h = (out_h > 1) ? static_cast<T>(in_h - 1) / (out_h - 1) : 0.f;
+    T ratio_w = (out_w > 1) ? static_cast<T>(in_w - 1) / (out_w - 1) : 0.f;
+
+    if (in_h == out_h && in_w == out_w) {
+      memcpy(d_input, d_output, d_input_t->numel() * sizeof(T));
+    } else {
+      hl_bilinear_backward(d_input, in_h, in_w, batch_size, in_chw, d_output,
+                           out_h, out_w, batch_size, out_chw, channels, ratio_h,
+                           ratio_w);
+    }
+  }
+};
+
+}  // namespace operators
+}  // namespace paddle
+
+namespace ops = paddle::operators;
+REGISTER_OP_CUDA_KERNEL(bilinear_interp,
+                        ops::BilinearInterpOpCUDAKernel<float>);
+REGISTER_OP_CUDA_KERNEL(bilinear_interp_grad,
+                        ops::BilinearInterpGradOpCUDAKernel<float>);
\ No newline at end of file
diff --git a/paddle/fluid/operators/bilinear_interp_op.h b/paddle/fluid/operators/bilinear_interp_op.h
index fe4cf0b6098..8dbc7a7485d 100644
--- a/paddle/fluid/operators/bilinear_interp_op.h
+++ b/paddle/fluid/operators/bilinear_interp_op.h
@@ -105,7 +105,7 @@ class BilinearInterpGradKernel : public framework::OpKernel<T> {
     T ratio_w = (out_w > 1) ? static_cast<T>(in_w - 1) / (out_w - 1) : 0.f;
 
     if (in_h == out_h && in_w == out_w) {
-      memcpy(d_input, d_output, product(d_input_t->dims()) * sizeof(T));
+      memcpy(d_input, d_output, d_input_t->numel() * sizeof(T));
     } else {
       for (int k = 0; k < batch_size; ++k) {  // loop for batches
         for (int i = 0; i < out_h; ++i) {     // loop for images
-- 
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