code: def __init__(self, data_path="./data/"):
      super(MultiBodyValidDataset, self).__init__(
          data_path + "n_body_valid.npz"
      )
  
imports: import copy
  import os
  import dgl
  import networkx
  import numpy
  import torch
  from torch.utils.data import DataLoader, Dataset
label_desc: Use image node_id 1 to create a new MultiBodyValidDataset object from inherited base classes: MultiBodyDataset with example: obj = MultiBodyValidDataset(data_path)