code: def train(self):
      return ModelNetDataset(self, "train")
  
file_path: dgl/examples/pytorch/pointcloud/edgeconv/modelnet.py
imports: import numpy
  from torch.utils.data import Dataset
label_desc: Use image node_id 2 for calling the ModelNet obj's underlying member method code with example usage: obj.train() and returns: ModelNetDataset