Return the unique elements of the array.

    Parameters
    ----------
    array : numpy.ndarray or WeldObject
        Input array.
    weld_type : WeldType
        Type of each element in the input array.

    Returns
    -------
    WeldObject
        Representation of this computation.

def weld_unique(array, weld_type):
    """Return the unique elements of the array.

    Parameters
    ----------
    array : numpy.ndarray or WeldObject
        Input array.
    weld_type : WeldType
        Type of each element in the input array.

    Returns
    -------
    WeldObject
        Representation of this computation.

    """
    obj_id, weld_obj = create_weld_object(array)

    weld_template = """map(
    tovec(
        result(
            for(
                map(
                    {array},
                    |e| 
                        {{e, 0si}}
                ),
                dictmerger[{type}, i16, +],
                |b: dictmerger[{type}, i16, +], i: i64, e: {{{type}, i16}}| 
                    merge(b, e)
            )
        )
    ),
    |e| 
        e.$0
)"""

    weld_obj.weld_code = weld_template.format(array=obj_id,
                                              type=weld_type)

    return weld_obj