code: def __len__(self):
      return len(self.datapath)
  
file_path: dgl/examples/pytorch/pointcloud/pct/ModelNetDataLoader.py
imports: import os
  import warnings
  import numpy
  from torch.utils.data import Dataset
label_desc: Use image node_id 2 for calling the ModelNetDataLoader obj's underlying member method code with example usage: obj.__len__() and returns: len