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Args:
root (string): Root directory of dataset where ``MovingMNIST/mnist_test_seq.npy`` exists.
split (string, optional): The dataset split, supports ``None`` (default), ``"train"`` and ``"test"``.
If ``split=None``, the full data is returned.
split_ratio (int, optional): The split ratio of number of frames. If ``split="train"``, the first split
frames ``data[:, :split_ratio]`` is returned. If ``split="test"``, the last split frames ``data[:, split_ratio:]``
is returned. If ``split=None``, this parameter is ignored and the all frames data is returned.
transform (callable, optional): A function/transform that takes in an torch Tensor
and returns a transformed version. E.g, ``transforms.RandomCrop``
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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