Function Train

examples/cpp/cifar10/vgg-parallel.cc:205–309

}

void Train(float lr, int num_epoch, string data_dir) {
  Cifar10 data(data_dir);
  Tensor train_x, train_y, test_x, test_y;
  Tensor train_x_1, train_x_2, train_y_1, train_y_2;
  {
    auto train = data.ReadTrainData();
    size_t nsamples = train.first.shape(0);
    auto mtrain =
        Reshape(train.first, Shape{nsamples, train.first.Size() / nsamples});
    const Tensor &mean = Average(mtrain, 0);
    SubRow(mean, &mtrain);
    Tensor std = Square(mtrain);
    std = Average(std, 0);
    std = Sqrt(std);;
    std += 1e-6f;
    DivRow(std, &mtrain);

    train_x = Reshape(mtrain, train.first.shape());
    train_y = train.second;

    LOG(INFO) << "Slicing training data...";
    train_x_1 = Tensor(Shape{nsamples / 2, train.first.shape(1),
        train.first.shape(2), train.first.shape(3)});
    LOG(INFO) << "Copying first data slice...";
    CopyDataToFrom(&train_x_1, train_x, train_x.Size() / 2);
    train_x_2 = Tensor(Shape{nsamples / 2, train.first.shape(1),
        train.first.shape(2), train.first.shape(3)});
    LOG(INFO) << "Copying second data slice...";
    CopyDataToFrom(&train_x_2, train_x, train_x.Size() / 2, 0,
                   train_x.Size() / 2);
    train_y_1 = Tensor(Shape{nsamples / 2});
    train_y_1.AsType(kInt);
    LOG(INFO) << "Copying first label slice...";
    CopyDataToFrom(&train_y_1, train_y, train_y.Size() / 2);
    train_y_2 = Tensor(Shape{nsamples / 2});
    train_y_2.AsType(kInt);
    LOG(INFO) << "Copying second label slice...";
    CopyDataToFrom(&train_y_2, train_y, train_y.Size() / 2, 0,
                   train_y.Size() / 2);

    auto test = data.ReadTestData();
    nsamples = test.first.shape(0);
    auto mtest =
        Reshape(test.first, Shape{nsamples, test.first.Size() / nsamples});
    SubRow(mean, &mtest);
    DivRow(std, &mtest);
    test_x = Reshape(mtest, test.first.shape());
    test_y = test.second;
  }

  CHECK_EQ(train_x.shape(0), train_y.shape(0));
  CHECK_EQ(test_x.shape(0), test_y.shape(0));
  LOG(INFO) << "Total Training samples = " << train_y.shape(0)
            << ", Total Test samples = " << test_y.shape(0);
  CHECK_EQ(train_x_1.shape(0), train_y_1.shape(0));
  LOG(INFO) << "On net 1, Training samples = " << train_y_1.shape(0)
            << ", Test samples = " << test_y.shape(0);
  CHECK_EQ(train_x_2.shape(0), train_y_2.shape(0));