code: def __init__(self, *datasets):
      for dataset in datasets[1:]:
          if not dataset.keys == datasets[0].keys:
              raise ValueError("All datasets must have the same keys")
  
      self._datasets = datasets
  
file_path: chainer/chainer/dataset/tabular/_concat.py
imports: import six
  from chainer.dataset.tabular import tabular_dataset
label_desc: Use image node_id 1 to create a new _Concat object from inherited base classes: tabular_dataset with example: obj = _Concat()