Function CheckSamplingMask

tests/cpp/tree/test_sampler.h:38–45

Check that sampling mask was correctly applied from split gradient to value gradient.

// Check that sampling mask was correctly applied from split gradient to value gradient.
inline void CheckSamplingMask(linalg::MatrixView<GradientPair> h_split,
                              linalg::MatrixView<GradientPair> h_value, float subsample) {
  auto n_samples = h_value.Shape(0);
  std::size_t sampled_count = CheckSampledRows(h_split, h_value);
  // Verify approximately the right fraction of rows are sampled
  double sampled_fraction = static_cast<double>(sampled_count) / static_cast<double>(n_samples);
  ASSERT_NEAR(sampled_fraction, subsample, 0.05);
}

inline void CheckSampling(float subsample, bst_target_t n_targets, bool check_sum,
                          std::vector<GradientPairPrecise> const& sum_sampled_gpair,