test/singa/test_nesterov.cc

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#include "gtest/gtest.h"
#include "singa/model/optimizer.h"
#include "singa/singa_config.h"

TEST(Nesterov, ApplyCPU) {
  singa::Nesterov nesterov;
  float lr = 0.1f;
  auto func = [](int step) { return step <= 5 ? 0.5f : 0.9f; };
  nesterov.SetMomentumGenerator(func);
  const float v[4] = {0.1f, 0.2f, 0.3f, 0.4f};
  const float g[4] = {0.01f, 0.02f, 0.03f, 0.04f};

  singa::Tensor value(singa::Shape{4}), grad(singa::Shape{4});
  value.CopyDataFromHostPtr(v, 4);
  grad.CopyDataFromHostPtr(g, 4);

  nesterov.Apply(0, lr, "xx", grad, value);

  singa::Tensor v1 = value.Clone();
  const float* newv1 = v1.data<float>();
  float history[4], tmp[4];
  for (int i = 0; i < 4; ++i) {
    history[i] = g[i] * lr;
    tmp[i] = history[i] * (1 + func(0));
  }
  for (int i = 0; i < 4; ++i) EXPECT_FLOAT_EQ(newv1[i], v[i] - tmp[i]);

  grad.CopyDataFromHostPtr(g, 4);
  nesterov.Apply(1, lr, "xx", grad, value);
  singa::Tensor v2 = value.Clone();
  const float* newv2 = v2.data<float>();
  for (int i = 0; i < 4; ++i) {
    tmp[i] = history[i];
    history[i] = history[i] * func(1) + g[i] * lr;
    tmp[i] = history[i] * (1 + func(1)) - tmp[i] * func(1);
  }

  for (int i = 0; i < 4; ++i) EXPECT_FLOAT_EQ(newv2[i], newv1[i] - tmp[i]);
}

#ifdef USE_CUDA
TEST(Nesterov, ApplyCUDA) {
  singa::Nesterov nesterov;
  float lr = 0.1f;
  auto func = [](int step) { return step <= 5 ? 0.5f : 0.9f; };
  nesterov.SetMomentumGenerator(func);
  const float v[4] = {0.1, 0.2, 0.3, 0.4};
  const float g[4] = {0.01, 0.02, 0.03, 0.04};

  auto dev = std::make_shared<singa::CudaGPU>();
  singa::Tensor value(singa::Shape{4}, dev), grad(singa::Shape{4}, dev);
  value.CopyDataFromHostPtr(v, 4);
  grad.CopyDataFromHostPtr(g, 4);

  nesterov.Apply(0, lr, "xx", grad, value);

  singa::Tensor v1 = value.Clone();
  v1.ToHost();
  const float* newv1 = v1.data<float>();
  float history[4], tmp[4];
  for (int i = 0; i < 4; ++i) {
    history[i] = g[i] * lr;
    tmp[i] = history[i] * (1 + func(0));
  }
  for (int i = 0; i < 4; ++i) EXPECT_FLOAT_EQ(newv1[i], v[i] - tmp[i]);

  grad.CopyDataFromHostPtr(g, 4);
  nesterov.Apply(1, lr, "xx", grad, value);
  singa::Tensor v2 = value.Clone();
  v2.ToHost();
  const float* newv2 = v2.data<float>();
  for (int i = 0; i < 4; ++i) {
    tmp[i] = history[i];
    history[i] = history[i] * func(1) + g[i] * lr;
    tmp[i] = history[i] * (1 + func(1)) - tmp[i] * func(1);
  }

  for (int i = 0; i < 4; ++i) EXPECT_FLOAT_EQ(newv2[i], newv1[i] - tmp[i]);
}
#endif