code: def __call__(self, data):
      d = dict(data)
      for key in self.keys:
          label = d[key]
          label[label > 0] = self.value
          d[key] = label
      return d
  
file_path: MONAILabel/monailabel/transform/pre.py
imports: import logging
  from typing import Optional
  from monai.config import KeysCollection
  from monai.data import ImageReader, MetaTensor
  from monai.transforms import LoadImaged, MapTransform
  from monai.utils import PostFix
label_desc: Use image node_id 2 for calling the NormalizeLabeld obj's underlying member method code with example usage: obj.__call__(data) and returns: d