class_docstr: Object that "owns" a file on a filesystem. If the ``filename`` is None,
  it maintains a temporary file which name is accessible via ``name``
  attribute; when pickling, the contents of this file is pickled;
  when unpickling, a new temp file is created; temp files are auto-deleted.
code: def refresh(self):
      self.cleanup()
      self.ensure_name()
  
file_path: sklearn-crfsuite/sklearn_crfsuite/_fileresource.py
imports: from __future__ import absolute_import
  import os
  import tempfile
label_desc: Use image node_id 4 for calling the FileResource obj's underlying member method code with example usage: obj.refresh() without return types