code: def close(self, unlink=True):
      self._model = None
  
      _log.debug("releasing SHM buffers")
      self.buffers = None
      if self.memory is not None:
          self.memory.close()
          if unlink and self.is_owner and self.is_owner != "transfer":
              self.memory.unlink()
              self.is_owner = False
          self.memory = None
  
file_path: lkpy/lenskit/sharing/shm.py
imports: import sys
  import logging
  import pickle
  from .None import sharing_mode, PersistedModel
  import multiprocessing.shared_memory
label_desc: Use image node_id 3 for calling the SHMPersisted obj's underlying member method code with example usage: obj.close(unlink) without return types