class_docstr: Contructor 
class_docstr_tok: ["Contructor"]
code: def group_size(self):
      return len(self.get_group_list())
  
file_path: deepchem/examples/roitberg/pyanitools.py
imports: import h5py
  import numpy
  import platform
  import os
label_desc: Use image node_id 7 for calling the anidataloader obj's underlying member method code with example usage: obj.group_size() and returns: len