class_docstr: Function Caller for NN evaluations. 
class_docstr_tok: ["Function","Caller","for","NN","evaluations","."]
docstr: Get fidel cost. 
docstr_tok: ["Get","fidel","cost","."]
code: def _fidel_cost(self, fidel):
      """Get fidel cost."""
      raw_fidel = self.get_raw_fidel_from_processed(fidel)
      return self._raw_fidel_cost(raw_fidel)
  
file_path: dragonfly/examples/nas/nn_function_caller.py
imports: from copy import deepcopy
  import numpy
  from time import sleep
  from dragonfly.exd.experiment_caller import CPFunctionCaller
  from dragonfly.exd.exd_core import EVAL_ERROR_CODE
  from dragonfly.utils.reporters import get_reporter
label_desc: Use image node_id 3 for calling the NNFunctionCaller obj's underlying member method code with example usage: obj._fidel_cost(fidel) and returns: self