code: def is_coalesced(self) -> bool:
      idx = self._col.new_full((self._col.numel() + 1,), -1)
      idx[1:] = self._sparse_sizes[1] * self.row() + self._col
      return bool((idx[1:] > idx[:-1]).all())
  
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 26 for calling the SparseStorage obj's underlying member method code with example usage: obj.is_coalesced() and returns: bool