code: def __len__(self):
      return len(self.data) * self.repeat
  
file_path: PGL/examples/graph_based_clustering_demo/dataset.py
imports: import os
  import paddle
  import numpy
  from pgl import graph_kernel
  from pgl.utils.logger import log
  from pgl.utils.data import Dataset
  from pgl.sampling import node2vec_walk
  from pgl.graph_kernel import skip_gram_gen_pair
label_desc: Use image node_id 3 for calling the ShardedDataset obj's underlying member method code with example usage: obj.__len__() and returns: unknown