code: def __init__(self, name, comm, cp_interval, gc_interval, path):
      self.name = name
      self.cp_interval = cp_interval
      self.gc_interval = gc_interval
      self.comm = comm
      self.files = []
      self.stats = _CheckpointStats()
  
      # TODO(kuenishi): support path expression such as
      # 'path/{rank}/snapshot' or 'path/{host}/snapshot'
      if path is not None:
          self.path = path
          _maybe_makedirs(self.path)
      else:
          self.path = None
  
      assert name is not None
      assert self.cp_interval > 0
      assert self.gc_interval > 0
      assert self.comm is not None
  
imports: import errno
  import os
  import shutil
  import tempfile
  import time
  import warnings
  import chainer
  from chainer.training import extension
label_desc: Use image node_id 1 to create a new _MultiNodeCheckpointer object from inherited base classes: extension with example: obj = _MultiNodeCheckpointer(name, comm, cp_interval, gc_interval, path)