docstr: Number of upsample operations
          
docstr_tok: ["Number","of","upsample","operations"]
code: def num_upsample(self):
      """Number of upsample operations"""
      return len(self.upsample) if self.upsample 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 4 for calling the MultiScalePair obj's underlying member method code with example usage: obj.num_upsample() and returns: unknown