code: def grobid(pdf_folder, grobid_home=None, grobid_jar=None):
      
      # TODO: Should be using https://github.com/kermitt2/grobid-example and
      # BibTeX backend.
      if grobid_home is None or grobid_jar is None:
          # User should pass the correct paths
          return False
  
      try:
          subprocess.call(["java",
                           "-jar", grobid_jar,
                           # Avoid OutOfMemoryException
                           "-Xmx1024m",
                           "-gH", grobid_home,
                           "-gP", os.path.join(grobid_home,
                                               "config/grobid.properties"),
                           "-dIn", pdf_folder,
                           "-exe", "processReferences"])
          return True
      except subprocess.CalledProcessError:
          return False
docs: Run `Grobid <https://github.com/kermitt2/grobid>`_ on a given folder to \
              extract references.
  
      .. note::
  
          Before using this function, you have to download and build Grobid on \
                  your system. See \
                  `<https://grobid.readthedocs.org/en/latest/Install-Grobid/>`_ \
                  for more infos on this. You need Java to be in your ``$PATH``.
  
      :param pdf_folder: Folder containing the PDF files to handle.
      :param grobid_home: Path to the grobid-home directory.
      :param grobid_jar: Path to the built Grobid JAR file.
      :returns: ``True``, or ``False`` if an error occurred.