class_docstr: Track a series of values and provide access to smoothed values over a
  window or the global series average.
code: def get_latest(self):
      return self.averaged_value_deque[-1]
  
imports: from collections import defaultdict, deque
  import torch
  from mmf.common.registry import registry
  from mmf.utils.distributed import reduce_dict
  from mmf.utils.general import scalarize_dict_values
label_desc: Use image node_id 7 for calling the SmoothedValue obj's underlying member method code with example usage: obj.get_latest() and returns: self