code: def persist_binpickle(model, dir=None, file=None):
      """
      Persist a model using binpickle.
  
      Args:
          model: The model to persist.
          dir: The temporary directory for persisting the model object.
          file: The file in which to save the object.
  
      Returns:
          PersistedModel: The persisted object.
      """
      if file is not None:
          path = pathlib.Path(file)
      else:
          if dir is None:
              dir = os.environ.get("LK_TEMP_DIR", None)
          fd, path = tempfile.mkstemp(
              suffix=".bpk", prefix="lkpy-", dir=dir
          )
          os.close(fd)
          path = pathlib.Path(path)
      _log.debug("persisting %s to %s", model, path)
      with binpickle.BinPickler.mappable(path) as bp, sharing_mode():
          bp.dump(model)
      return BPKPersisted(path)
  
file_path: lkpy/lenskit/sharing/binpickle.py
imports: import os
  import pathlib
  import tempfile
  import logging
  import gc
  import binpickle
  from .None import sharing_mode, PersistedModel
label_desc: Use image node_id 1 for calling a global function with example usage: persist_binpickle(model, dir, file) and returns: BPKPersisted