r/MachineLearning - [D] Clarification on word2vec 'generate_batch()'

I have been trying to understand how it works to apply it to my test and dataset (I find that tensorflow code on github is too complex and not very straightforward). I will be using a skip-gram model. This is the code that I wrote. I'd like a non cryptic explanation of what's going on and what I need to do to make this work. This is where I am right now.