src/datasets/combine.py [124:145]:
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        if not isinstance(dataset, (Dataset, IterableDataset)):
            if isinstance(dataset, (DatasetDict, IterableDatasetDict)):
                if not dataset:
                    raise ValueError(
                        f"Expected a list of Dataset objects or a list of IterableDataset objects, but element at position {i} "
                        "is an empty dataset dictionary."
                    )
                raise ValueError(
                    f"Dataset at position {i} has at least one split: {list(dataset)}\n"
                    f"Please pick one to interleave with the other datasets, for example: dataset['{next(iter(dataset))}']"
                )
            raise ValueError(
                f"Expected a list of Dataset objects or a list of IterableDataset objects, but element at position {i} is a {type(dataset).__name__}."
            )
        if i == 0:
            dataset_type, other_type = (
                (Dataset, IterableDataset) if isinstance(dataset, Dataset) else (IterableDataset, Dataset)
            )
        elif not isinstance(dataset, dataset_type):
            raise ValueError(
                f"Unable to interleave a {dataset_type.__name__} (at position 0) with a {other_type.__name__} (at position {i}). Expected a list of Dataset objects or a list of IterableDataset objects."
            )
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src/datasets/combine.py [190:211]:
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        if not isinstance(dataset, (Dataset, IterableDataset)):
            if isinstance(dataset, (DatasetDict, IterableDatasetDict)):
                if not dataset:
                    raise ValueError(
                        f"Expected a list of Dataset objects or a list of IterableDataset objects, but element at position {i} "
                        "is an empty dataset dictionary."
                    )
                raise ValueError(
                    f"Dataset at position {i} has at least one split: {list(dataset)}\n"
                    f"Please pick one to interleave with the other datasets, for example: dataset['{next(iter(dataset))}']"
                )
            raise ValueError(
                f"Expected a list of Dataset objects or a list of IterableDataset objects, but element at position {i} is a {type(dataset).__name__}."
            )
        if i == 0:
            dataset_type, other_type = (
                (Dataset, IterableDataset) if isinstance(dataset, Dataset) else (IterableDataset, Dataset)
            )
        elif not isinstance(dataset, dataset_type):
            raise ValueError(
                f"Unable to interleave a {dataset_type.__name__} (at position 0) with a {other_type.__name__} (at position {i}). Expected a list of Dataset objects or a list of IterableDataset objects."
            )
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