code: def card(self):
      return self.cardinality
  
imports: import os
  import sys
  import tempfile
  import pickle
  import numpy
  import numpy.random
  from .spearmint_pb2 import *
  from .Locker import *
  from .sobol_lib import *
  from .helpers import *
  import logging
label_desc: Use image node_id 3 for calling the GridMap obj's underlying member method code with example usage: obj.card() and returns: self