Programming Language processing using Neural Nets

I came across this paper https://arxiv.org/pdf/1409.5718.pdf on using neural nets on programming language.

Here they make a model which can say whether a piece of code has a algorithm in it. Say a bubble sort detector.

I am bit new to reading papers, I need help on how to go about implementing the results of the paper. There is no code attached as far as I could see.