code: def fill_empty_with_zero(self):
      retval = self
      for name, value in self._asdict().items():
          if value is None:
              retval = retval._replace(
                  **{
                      name: CpeEstimate(
                          raw=0.0,
                          normalized=0.0,
                          raw_std_error=0.0,
                          normalized_std_error=0.0,
                      )
                  }
              )
      return retval
  
file_path: ReAgent/reagent/evaluation/cpe.py
imports: import logging
  import math
  from typing import Dict, NamedTuple, Optional
  import numpy
  import torch
  from reagent.core.tensorboardX import SummaryWriterContext
label_desc: Use image node_id 4 for calling the CpeEstimateSet obj's underlying member method code with example usage: obj.fill_empty_with_zero() and returns: retval