Beside the comments in the code itself, I also wrote an article which you can find here with further explanations on the Inception Module and GoogLeNet.
inception.py: Implementation of Inception ModuleInception Train & Test.ipynb: Notebook to train and test the implementation of Inception Module.layers: Contains files implementing basic layers [convolutions, max pooling and fully connected]
If you are having trouble viewing the notebook file, click here.