text: #pragma once
  #include "third_party/sparsehash/sparse_hash_map.h"
  
  extern template class SparseHashMap<int32_t>;
  extern template class SparseHashMap<int64_t>;
  extern template class SparseHashMap<uint32_t>;
  extern template class SparseHashMap<uint64_t>;
  extern template class SparseHashMap<float>;
  extern template class SparseHashMap<double>;