code: def csc2csr(self) -> torch.Tensor:
      csc2csr = self._csc2csr
      if csc2csr is not None:
          return csc2csr
  
      max_value = self._sparse_sizes[0] * self._sparse_sizes[1]
      _, csc2csr = index_sort(self.csr2csc(), max_value)
      self._csc2csr = csc2csr
      return csc2csr
  
imports: import warnings
  from typing import List, Optional, Tuple
  import torch
  from torch_scatter import scatter_add, segment_csr
  from torch_sparse.utils import Final, index_sort
label_desc: Use image node_id 25 for calling the SparseStorage obj's underlying member method code with example usage: obj.csc2csr() and returns: csc2csr, csc2csr