r"""Creates a sparse representention of ``sequence``.
        Returns a tuple with (indices, values, shape)

def to_sparse_tuple(sequence):
    r"""Creates a sparse representention of ``sequence``.
        Returns a tuple with (indices, values, shape)
    """
    indices = np.asarray(list(zip([0]*len(sequence), range(len(sequence)))), dtype=np.int64)
    shape = np.asarray([1, len(sequence)], dtype=np.int64)
    return indices, sequence, shape