code: def dump(self, path_or_filehandle):
      output = self._get_arff()
  
      if isinstance(path_or_filehandle, str):
          with open(path_or_filehandle, "w") as fh:
              arff.dump(output, fh)
      else:
          arff.dump(output, path_or_filehandle)
  
imports: from abc import ABCMeta, abstractmethod
  import time
  from io import StringIO
  import arff
  import scipy.sparse
label_desc: Use image node_id 4 for calling the DatasetMetafeatures obj's underlying member method code with example usage: obj.dump(path_or_filehandle) without return types