docs: def fpath(self, version=None, tags=None, ext=None):
          """Returns the filepath appropriate for an instance of this dataset.
  
          Parameters
          ----------
          version: str, optional
              The version of the instance of this dataset.
          tags : list of str, optional
              The tags associated with the given instance of this dataset.
          ext : str, optional
              The file extension to use. If not given, the default extension is
              used.
  
          Returns
          -------
          str
              The appropariate filepath.
          """
          if self.singleton:
              return dataset_filepath(
                  filename=self.fname(version=version, tags=tags, ext=ext),
                  task=self.task,
                  **self.kwargs,
              )
          return dataset_filepath(
              filename=self.fname(version=version, tags=tags, ext=ext),
              dataset_name=self.name,
              task=self.task,
              **self.kwargs,
          )