code: def mode(self):
      for dataset in self._datasets:
          if dataset.mode:
              return dataset.mode
      return tuple
  
file_path: chainer/chainer/dataset/tabular/_join.py
imports: import six
  from chainer.dataset.tabular import tabular_dataset
label_desc: Use image node_id 4 for calling the _Join obj's underlying member method code with example usage: obj.mode() and returns: tuple, dataset