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The SUN397 or Scene UNderstanding (SUN) is a dataset for scene recognition consisting of
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root (str or ``pathlib.Path``): Root directory of the dataset.
transform (callable, optional): A function/transform that takes in a 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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