class_docstr: Dataset for Annotations used in MMF
  
  TODO: Update on docs sprint
code: def __getitem__(self, idx):
      data = self.data[idx + self.start_idx]
  
      # Hacks for older IMDBs
      if "answers" not in data:
          if "all_answers" in data and "valid_answers" not in data:
              data["answers"] = data["all_answers"]
          if "valid_answers" in data:
              data["answers"] = data["valid_answers"]
  
      # TODO: Clean up VizWiz IMDB from copy tokens
      if "answers" in data and data["answers"][-1] == "<copy>":
          data["answers"] = data["answers"][:-1]
  
      return data
  
file_path: mmf/mmf/datasets/databases/annotation_database.py
imports: import json
  import numpy
  import torch
  from mmf.utils.file_io import PathManager
  from mmf.utils.general import get_absolute_path
label_desc: Use image node_id 8 for calling the AnnotationDatabase obj's underlying member method code with example usage: obj.__getitem__(idx) and returns: data