code: def __init__(self, path):
      self.path = path
      self.zipfile = np.load(self.path)
      self.node_state = self.zipfile["data"]
      self.node_label = self.zipfile["label"]
      self.n_particles = self.zipfile["n_particles"]
  
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 MultiBodyDataset object from inherited base classes: Dataset with example: obj = MultiBodyDataset(path)