code: def initialize_label_mapper(self):
      self.label_mapper = c_f.LabelMapper(
          self.set_min_label_to_zero, self.dataset_labels
      ).map
  
imports: from collections import defaultdict
  import torch
  import tqdm
  from ..utils import common_functions
  from ..utils import inference
  from ..utils.accuracy_calculator import AccuracyCalculator
label_desc: Use image node_id 2 for calling the BaseTester obj's underlying member method code with example usage: obj.initialize_label_mapper() without return types