class_docstr: Adadelta implementation for SGD: http://arxiv.org/abs/1212.5701
  
  :param decayrate interpolation parameter rho
  :param epsilon for numerical stability
  >>> adagrad = Adadelta()
  creating: createAdadelta
code: def __init__(self, decayrate=0.9, epsilon=1e-10):
      from bigdl.optim.optimizer import Adadelta as BAdadelta
  
      self.optimizer = BAdadelta(decayrate, epsilon, bigdl_type="float")
  
imports: from abc import ABC, abstractmethod
  from bigdl.util.common import DOUBLEMAX
  from zoo.orca.learn.optimizers.schedule import Scheduler
label_desc: Use image node_id 1 to create a new Adadelta object from inherited base classes: Optimizer with example: obj = Adadelta(decayrate, epsilon)