class_docstr: A sampling graph in CSC format.
class_docstr_tok: ["A","sampling","graph","in","CSC","format","."]
docstr: Returns the number of nodes in the graph.
  
  Returns
  -------
  int
      The number of rows in the dense format.
docstr_tok: ["Returns","the","number","of","nodes","in","the","graph",".","Returns","--","--","--","-","int","The","number","of","rows","in","the","dense","format","."]
code: def total_num_nodes(self) -> int:
      """Returns the number of nodes in the graph.
  
      Returns
      -------
      int
          The number of rows in the dense format.
      """
      return self._c_csc_graph.num_nodes()
  
imports: from typing import Dict, Optional, Union
  import torch
  from dgl.utils import recursive_apply
  from ...base import EID, ETYPE, NID, NTYPE
  from ...convert import to_homogeneous
  from ...heterograph import DGLGraph
  from ..base import etype_str_to_tuple, etype_tuple_to_str, ORIGINAL_EDGE_ID
  from ..sampling_graph import SamplingGraph
  from .sampled_subgraph_impl import CSCFormatBase, SampledSubgraphImpl
label_desc: Use image node_id 3 for calling the FusedCSCSamplingGraph obj's underlying member method code with example usage: obj.total_num_nodes() and returns: self