class_docstr: The user-facing class that provides metric storage functionalities.
  
  In the future we may add support for storing / logging other types of data if needed.
docstr: Returns:
      dict[str -> (float, int)]: mapping from the name of each scalar to the most
          recent value and the iteration number its added.
docstr_tok: ["Returns",":","dict","[","str","-",">","(","float",",","int",")","]",":","mapping","from","the","name","of","each","scalar","to","the","most","recent","value","and","the","iteration","number","its","added","."]
code: def latest(self):
      """
      Returns:
          dict[str -> (float, int)]: mapping from the name of each scalar to the most
              recent value and the iteration number its added.
      """
      return self._latest_scalars
  
imports: import datetime
  import json
  import logging
  import os
  import time
  from collections import defaultdict
  from contextlib import contextmanager
  from functools import cached_property
  from typing import Optional
  import torch
  from fvcore.common.history_buffer import HistoryBuffer
  from detectron2.utils.file_io import PathManager
label_desc: Use image node_id 8 for calling the EventStorage obj's underlying member method code with example usage: obj.latest() and returns: self