How to use the pyocr.builders.LineBoxBuilder function in pyocr

def set_builder(self):
        self._builder = builders.LineBoxBuilder()

if hasattr(obj, 'pages'):
            pages.update(obj.pages)
        else:
            pages.add(obj)

    index_updater = dsearch.get_index_updater(optimize=False)

    for page in set(pages):
        if empty_only and len(page.boxes) > 0:
            pages.remove(page)
            continue
        verbose("Running OCR on {} ...".format(page.pageid))
        page.boxes = ocr.image_to_string(
            page.img,
            lang=ocr_lang,
            builder=pyocr.builders.LineBoxBuilder()
        )
        docs.add(page.doc)

    verbose("Updating index ...")
    for doc in docs:
        index_updater.upd_doc(doc)
    index_updater.commit()
    verbose("Done")

    reply({
        "ocr": [page.pageid for page in pages]
    })

def ocr(im):
    tools = pyocr.get_available_tools()
    if len(tools) == 0:
        print("No OCR tool found")
        sys.exit(1)
    tool = tools[0]
    # print("Will use tool '%s'" % (tool.get_name()))

    # langs = tool.get_available_languages()
    lang = 'eng'
    # print("Will use lang '%s'" % (lang))

    return tool.image_to_string(
        Image.fromarray(im),
        lang=lang,
        builder=pyocr.builders.LineBoxBuilder()
    )

if orientation['angle'] != 0:
            # The angle provided by pyocr is clockwise, so we want to rotate
            # the image with an angle of -1 *  (clockwise).
            # PIL expect a counter-clockwise angle --> -1 * angle
            # So they both cancel each other.
            img = img.rotate(orientation['angle'], expand=True)

        for angle in self.angles:
            # tell the observer we decided to not OCR some orientations
            if angle == orientation['angle']:
                continue
            self.emit('ocr-score', angle, 0)

        boxes = self.ocr_tool.image_to_string(
            img, lang=self.langs['ocr'],
            builder=pyocr.builders.LineBoxBuilder())

        self.emit('ocr-score', orientation['angle'], 1)

        return (orientation['angle'], img, boxes)

def __set_boxes(self, boxes):
        boxfile = self.__get_box_path()
        with codecs.open(boxfile, 'w', encoding='utf-8') as file_desc:
            pyocr.builders.LineBoxBuilder().write_file(file_desc, boxes)
        self.drop_cache()
        self.doc.drop_cache()

def __set_boxes(self, boxes):
        boxfile = self.__box_path
        with codecs.open(boxfile, 'w', encoding='utf-8') as file_desc:
            pyocr.builders.LineBoxBuilder().write_file(file_desc, boxes)
        self.drop_cache()
        self.doc.drop_cache()

def __set_boxes(self, boxes):
        boxfile = self.__box_path
        with self.fs.open(boxfile, 'w') as file_desc:
            pyocr.builders.LineBoxBuilder().write_file(file_desc, boxes)