class_docstr: An abstract base callback to set hyperparameters.
  
  Once the :meth:`trigger()` method is called,
  the method :meth:`_get_value_to_set` will be used to get a new value for the hyperparameter.
code: def _get_value_to_set(self):
      pass
  
imports: import operator
  import os
  import numpy
  from abc import ABCMeta, abstractmethod
  from collections import deque
  import six
  from ..compat import tfv1
  from ..tfutils.common import get_op_tensor_name
  from ..utils import logger
  from .base import Callback
label_desc: Use image node_id 4 for calling the HyperParamSetter obj's underlying member method code with example usage: obj._get_value_to_set() without return types