this behavior of the `randint` operator seems weird. Why are we not mimicking the behavior of [`numpy.random.randint`](https://docs.scipy.org/doc/numpy-1.15.1/reference/generated/numpy.random.randint.html) function. Even pytorch's [`torch.randperm`](https://pytorch.org/docs/0.3.1/torch.html?highlight=torch%20random#torch.randperm) is defined similarly.
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