Ref:

• Winner (also the winner of the criteo comp) https://github.com/guestwalk/kaggle-avazu Discussion: https://www.kaggle.com/c/avazu-ctr-prediction/discussion/12608
• 2nd place soln https://github.com/owenzhang/kaggle-avazu
• Feature ideas: https://medium.com/unstructured/how-feature-engineering-can-help-you-do-well-in-a-kaggle-competition-part-i-9cc9a883514d