code: def train_val_test_split(
      G,
      node_type=None,
      test_size=0.4,
      train_size=0.2,
      targets=None,
      split_equally=False,
      seed=None,
  ):
      raise ValueError(_MSG)
  
label_desc: Use image node_id 1 for calling a global function with example usage: train_val_test_split(G, node_type, test_size, train_size, targets, split_equally, seed) without return types