code: def train_valid_loader(self):
      return self.train_loader, self.valid_loader
  
file_path: dgl/examples/mxnet/gin/dataloader.py
imports: import math
  import dgl
  import numpy
  from mxnet import nd
  from mxnet.gluon.data import DataLoader, Sampler
  from sklearn.model_selection import StratifiedKFold
label_desc: Use image node_id 2 for calling the GraphDataLoader obj's underlying member method code with example usage: obj.train_valid_loader() and returns: self,  self