code: def _write_buffer(self, key):
      if not self.buffer_dict[key]:
          return
      self.handles[key].write(
          "".join(
              py_io.to_jsonl(entry) + "\n"
              for entry in self.buffer_dict[key]
          )
      )
      self.buffer_dict[key] = []
  
imports: import os
  import time
  import torch
  import traceback
  from contextlib import contextmanager
  import jiant.utils.python.io
  import jiant.utils.python.filesystem
label_desc: Use image node_id 4 for calling the ZBufferedLogger obj's underlying member method code with example usage: obj._write_buffer(key) without return types