How to use the tesserocr.OEM.TESSERACT_ONLY function in tesserocr

def test_init(self):
        """Test Init calls with different lang and oem."""
        self._api.Init(lang='eng+osd')
        self.assertEqual(self._api.GetInitLanguagesAsString(), 'eng+osd')
        self._api.Init(lang='eng')
        self.assertEqual(self._api.GetInitLanguagesAsString(), 'eng')
        self._api.Init(oem=tesserocr.OEM.TESSERACT_ONLY)
        self.assertEqual(self._api.oem(), tesserocr.OEM.TESSERACT_ONLY)

def test_init(self):
        """Test Init calls with different lang and oem."""
        self._api.Init(lang='eng+osd')
        self.assertEqual(self._api.GetInitLanguagesAsString(), 'eng+osd')
        self._api.Init(lang='eng')
        self.assertEqual(self._api.GetInitLanguagesAsString(), 'eng')
        self._api.Init(oem=tesserocr.OEM.TESSERACT_ONLY)
        self.assertEqual(self._api.oem(), tesserocr.OEM.TESSERACT_ONLY)

black_pixel_count = image[image == 0].size
    white_pixel_count = image[image == 1].size

    if black_pixel_count > white_pixel_count:
        image = skimage.util.invert(image)

    image = skimage.morphology.closing(image, skimage.morphology.rectangle(1, horizontal_closing))
    image = skimage.morphology.closing(image, skimage.morphology.rectangle(vertical_closing, 1))

    image = skimage.util.img_as_ubyte(image)

    if is_unix():
        return tesserocr.image_to_text(
            Image.fromarray(image),
            psm=tesserocr.PSM.SINGLE_LINE,
            oem=tesserocr.OEM.TESSERACT_ONLY
        ).strip()
    elif is_windows():
        return pytesseract.image_to_string(Image.fromarray(image))