
def utility_function_1(vds):
    """One line description of this function.

    **Examples**

    < examples go here >

    **Notes**

    < extra notes go here >

    :param vds: Dataset to modify.
    :type vds: VariantDataset

    :rtype: VariantDataset
    """
    raise NotImplementedError

def utility_function_2(kt):
    """Takes a key table as an argument, does some stuff, and returns a new key table.

    :param kt: Key table to modify.
    :type kt: KeyTable

    :rtype: KeyTable
    """
    raise NotImplementedError