class_docstr: base class for classfication 
code: def postproc_fn(self):
      postproc_name = self.config["solver"]["postproc"]["name"]
      postproc = registers.postprocess[postproc_name](self.config)
  
      return postproc
  
imports: import os
  import re
  import functools
  import collections
  from absl import logging
  import delta.compat
  from tensorflow.python import debug
  from tensorflow.python.estimator.canned import metric_keys
  from tensorboard.plugins.pr_curve import summary
  from delta import utils
  from delta.utils.hparam import HParams
  from delta.utils import metrics
  from delta.utils import summary
  from delta.utils.register import registers
  from delta.utils.solver.base_solver import ABCEstimatorSolver
label_desc: Use image node_id 20 for calling the EstimatorSolver obj's underlying member method code with example usage: obj.postproc_fn() and returns: postproc