/* Copyright (c) 2016 PaddlePaddle 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 <gtest/gtest.h>
#include "paddle/fluid/memory/memcpy.h"
#include "paddle/fluid/memory/memory.h"
#include "paddle/fluid/platform/hostdevice.h"
#include "paddle/fluid/platform/transform.h"

template <typename T>
class Scale {
 public:
  explicit Scale(const T& scale) : scale_(scale) {}

  HOSTDEVICE T operator()(const T& a) const { return a * scale_; }

 private:
  T scale_;
};

template <typename T>
class Multiply {
 public:
  HOSTDEVICE T operator()(const T& a, const T& b) const { return a * b; }
};

TEST(Transform, CPUUnary) {
  using namespace paddle::platform;
  CPUDeviceContext ctx;
  float buf[4] = {0.1, 0.2, 0.3, 0.4};
  Transform<paddle::platform::CPUDeviceContext> trans;
  trans(ctx, buf, buf + 4, buf, Scale<float>(10));
  for (int i = 0; i < 4; ++i) {
    ASSERT_NEAR(buf[i], static_cast<float>(i + 1), 1e-5);
  }
}

TEST(Transform, GPUUnary) {
  using namespace paddle::platform;
  using namespace paddle::memory;
  CUDAPlace gpu0(0);
  CUDADeviceContext ctx(gpu0);
  float cpu_buf[4] = {0.1, 0.2, 0.3, 0.4};
  float* gpu_buf = static_cast<float*>(Alloc(gpu0, sizeof(float) * 4));
  Copy(gpu0, gpu_buf, CPUPlace(), cpu_buf, sizeof(cpu_buf), ctx.stream());
  Transform<paddle::platform::CUDADeviceContext> trans;
  trans(ctx, gpu_buf, gpu_buf + 4, gpu_buf, Scale<float>(10));
  ctx.Wait();
  Copy(CPUPlace(), cpu_buf, gpu0, gpu_buf, sizeof(cpu_buf), ctx.stream());
  Free(gpu0, gpu_buf);
  for (int i = 0; i < 4; ++i) {
    ASSERT_NEAR(cpu_buf[i], static_cast<float>(i + 1), 1e-5);
  }
}

TEST(Transform, CPUBinary) {
  using namespace paddle::platform;
  using namespace paddle::memory;
  int buf[4] = {1, 2, 3, 4};
  Transform<paddle::platform::CPUDeviceContext> trans;
  CPUDeviceContext ctx;
  trans(ctx, buf, buf + 4, buf, buf, Multiply<int>());
  for (int i = 0; i < 4; ++i) {
    ASSERT_EQ((i + 1) * (i + 1), buf[i]);
  }
}

TEST(Transform, GPUBinary) {
  using namespace paddle::platform;
  using namespace paddle::memory;
  int buf[4] = {1, 2, 3, 4};
  CUDAPlace gpu0(0);
  CUDADeviceContext ctx(gpu0);
  int* gpu_buf = static_cast<int*>(Alloc(gpu0, sizeof(buf)));
  Copy(gpu0, gpu_buf, CPUPlace(), buf, sizeof(buf), ctx.stream());
  Transform<paddle::platform::CUDADeviceContext> trans;
  trans(ctx, gpu_buf, gpu_buf + 4, gpu_buf, gpu_buf, Multiply<int>());
  ctx.Wait();
  Copy(CPUPlace(), buf, gpu0, gpu_buf, sizeof(buf), ctx.stream());
  Free(gpu0, gpu_buf);
  for (int i = 0; i < 4; ++i) {
    ASSERT_EQ((i + 1) * (i + 1), buf[i]);
  }
}
