code: def close_writer(log_dir, logger):
      """
      Decrement the reference count for a writer belonging to a specific log directory.
      If the reference count gets to zero, the writer will be closed and removed.
  
      Args:
          log_dir (str): the log directory
          logger: the object releasing the writer
      """
      if log_dir in __writers__:
          __writers__[log_dir]["references"].discard(logger)
  
          if len(__writers__[log_dir]["references"]) == 0:
              if "writer" in __writers__[log_dir]:
                  __writers__[log_dir]["writer"].close()
  
              if "writer_visdom" in __writers__[log_dir]:
                  __writers__[log_dir]["writer_visdom"].close()
  
          del __writers__[log_dir]
  
imports: import copy
  import os
  import warnings
  import torch
  import torch.nn.functional
  import torchbearer
  from torchbearer.callbacks import Callback
label_desc: Use image node_id 2 for calling a global function with example usage: close_writer(log_dir, logger) without return types