code: def colcount(self) -> torch.Tensor:
      colcount = self._colcount
      if colcount is not None:
          return colcount
  
      colptr = self._colptr
      if colptr is not None:
          colcount = colptr[1:] - colptr[:-1]
      else:
          colcount = scatter_add(
              torch.ones_like(self._col),
              self._col,
              dim_size=self._sparse_sizes[1],
          )
      self._colcount = colcount
      return colcount
  
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 21 for calling the SparseStorage obj's underlying member method code with example usage: obj.colcount() and returns: colcount, colcount