Function MakeCachePrefix

src/data/sparse_page_source.cc:34–46

}

std::string MakeCachePrefix(std::string cache_prefix) {
  std::string_view constexpr kDftname{"DMatrix"};
  cache_prefix = cache_prefix.empty() ? kDftname : cache_prefix;
  // Use the directory if one exists
  if (std::filesystem::is_directory(cache_prefix)) {
    cache_prefix = (std::filesystem::path{cache_prefix} / kDftname).string();  // NOLINT
  }
  // Avoid conflicts in distributed environments.
  if (collective::IsDistributed()) {
    cache_prefix += ("-r" + std::to_string(collective::GetRank()));
  }
  return cache_prefix;
}
}  // namespace xgboost::data