>>> calculate_contingency_matrix(preds, target, eps=1e-16)
        tensor([[1.0000e+00, 1.0000e-16, 1.0000e+00],
                [1.0000e+00, 1.0000e+00, 1.0000e-16],
                [1.0000e-16, 1.0000e+00, 1.0000e-16]])

    NTz.Cannot specify `eps` and return sparse tensor.r