docstr: Number of scales in the multiscale array
          
docstr_tok: ["Number","of","scales","in","the","multiscale","array"]
code: def num_scales(self):
      """Number of scales in the multiscale array"""
      return len(self.multiscale) if self.multiscale else 0
  
imports: import torch
  from typing import List, Optional
  from torch_geometric.data import Data
  from torch_geometric.data import Batch
  from torch_points3d.datasets.multiscale_data import MultiScaleBatch, MultiScaleData
  import re
label_desc: Use image node_id 3 for calling the MultiScalePair obj's underlying member method code with example usage: obj.num_scales() and returns: unknown