Ocr, Tesseract, Opencv, Pytesseract, Optical Character Recogn.
Tesseract's oem modes '0' and '2' won't work with them. To use tessdata_fast models instead of tessdata, all you need to do is download your tessdata_fast language data file from here and place it inside your $TESSDATA_PREFIX directory. Need to digitize documents, receipts or invoices but too lazy