code: def __len__(self):
      return len(self.graphs)
  
imports: import os
  import pickle
  import numpy
  from scipy.spatial.distance import cdist
  from tqdm import tqdm
  from ..None import backend
  from ..convert import graph
  from .dgl_dataset import DGLDataset
  from .utils import download, extract_archive, load_graphs, save_graphs, Subset
label_desc: Use image node_id 11 for calling the SuperPixelDataset obj's underlying member method code with example usage: obj.__len__() and returns: len