How to use tesseract to recognzie verification code

[易鑫]

Hello,everyone :

     Now I want to use tesseract to train verification code,I have 20000 samples and labels.I use my own dataset ,so I use this project https://github.com/tesseract-ocr/tesstrain  .

The length of verification code is always 4. How to use this information to improve the accuracy,does this project has the configuration that define the length.

Thanks in advance.