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Args:
root (string): Root directory of the dataset.
split (string, optional): The dataset split, supports ``"train"`` (default), or ``"test"``.
transform (callable, optional): A function/transform that takes in an PIL image and returns a transformed
version. E.g, ``transforms.RandomCrop``.
target_transform (callable, optional): A function/transform that takes in the target and transforms it.
download (bool, optional): If True, downloads the dataset from the internet and
puts it in root directory. If dataset is already downloaded, it is not
downloaded again.
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