code: def to_dict(self):
      if self.is_singleton():
          spec = self.singleton()
          if isinstance(spec, self.value_type):
              return spec
          else:
              return spec.to_dict()
  
      else:
          return OrderedDict(
              (
                  (
                      name,
                      (
                          spec
                          if isinstance(spec, self.value_type)
                          else spec.to_dict()
                      ),
                  )
                  for name, spec in super(NestedDict, self).items()
                  if isinstance(spec, self.value_type) or len(spec) > 0
              )
          )
  
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 5 for calling the SignatureDict obj's underlying member method code with example usage: obj.to_dict() and returns: OrderedDict, spec, spec