code: def __getitem__(self, index):
      item = self.dataset[index]
      item["label"] = self.get_label(
          index, process_fn=self.process_label
      )
      return item
  
file_path: fairseq/fairseq/data/add_class_target_dataset.py
imports: import torch
  from .None import BaseWrapperDataset, data_utils
  from fairseq.data.text_compressor import TextCompressor, TextCompressionLevel
label_desc: Use image node_id 3 for calling the AddTargetDataset obj's underlying member method code with example usage: obj.__getitem__(index) and returns: item