Function RowPairFunctionFromDenseRows

src/c_api.cpp:1729–1742

data is array of pointers to individual rows

// data is array of pointers to individual rows
std::function<std::vector<std::pair<int, double>>(int row_idx)>
RowPairFunctionFromDenseRows(const void** data, int num_col, int data_type) {
  return [=](int row_idx) {
    auto inner_function = RowFunctionFromDenseMatric(data[row_idx], 1, num_col, data_type, /* is_row_major */ true);
    auto raw_values = inner_function(0);
    std::vector<std::pair<int, double>> ret;
    for (int i = 0; i < static_cast<int>(raw_values.size()); ++i) {
      if (std::fabs(raw_values[i]) > kZeroThreshold || std::isnan(raw_values[i])) {
        ret.emplace_back(i, raw_values[i]);
      }
    }
    return ret;
  };
}

std::function<std::vector<std::pair<int, double>>(int idx)>
RowFunctionFromCSR(const void* indptr, int indptr_type, const int32_t* indices, const void* data, int data_type, int64_t , int64_t ) {