Function MakeLabelForTest

tests/cpp/c_api/test_c_api.cc:392–407

namespace {
void MakeLabelForTest(std::shared_ptr<DMatrix> Xy, DMatrixHandle cxy) {
  auto n_samples = Xy->Info().num_row_;
  std::vector<float> y(n_samples);
  for (std::size_t i = 0; i < y.size(); ++i) {
    y[i] = static_cast<float>(i);
  }

  Xy->Info().labels.Reshape(n_samples);
  Xy->Info().labels.Data()->HostVector() = y;

  auto y_int = GetArrayInterface(Xy->Info().labels.Data(), n_samples, 1);
  std::string s_y_int;
  Json::Dump(y_int, &s_y_int);

  XGDMatrixSetInfoFromInterface(cxy, "label", s_y_int.c_str());
}

auto MakeSimpleDMatrixForTest(bst_idx_t n_samples, bst_feature_t n_features, Json dconfig) {
  HostDeviceVector<float> storage;