function randRotateMirror(dataset)

    for i=1,dataset:size() do

        theta = math.pi/2*torch.random(0,3)

        sample = dataset[i][1]

        sample = sample:double()

        sample = image.rotate(sample,theta)

        if torch.rand(1,2) == 1 then

            sample = image.hflip(sample)

        end

        dataset[i][1] = sample

    end

    return dataset

end