implementation details of ctc in lstm.py

[Ajinkya Kulkarni]

I am trying understand implementation of CTC layer in lstm.py but unable to locate decoding algorithm as mentioned in thesis paper by Alex graves like 

prefix decoding or token passing algorithm !!

So where should i look for implementation of Decoding algorithm used in CTC ????

Currently I am running lstm.py on english data for OCR purpose !!

Addition to this I have also installed RNNLIB and ran it as black box but I am facing same problem there as I cant see any decoding algorithm implementation in transducer.hpp !!