code: def num_args(self):
      return super(NestedDict, self).__len__()
  
imports: from collections import OrderedDict
  import numpy
  import tensorflow
  from tensorflow.python.training.tracking.tracking import AutoTrackable
  from tensorflow.python.training.tracking.data_structures import sticky_attribute_assignment
  from tensorforce.core.utils import NestedDict
label_desc: Use image node_id 3 for calling the SignatureDict obj's underlying member method code with example usage: obj.num_args() and returns: super