online learning
http://www.mit.edu/~rakhlin/6.883/
https://homes.cs.washington.edu/~icano/projects/asml.pdf
ftp://ftp.sas.com/pub/neural/FAQ2.html#A_styles_batch_vs_inc
https://www.analyticsvidhya.com/blog/2015/12/complete-tutorial-time-series-modeling/
https://www.analyticsvidhya.com/blog/2016/02/time-series-forecasting-codes-python/
http://www.ulb.ac.be/di/map/gbonte/ftp/time_ser.pdf
https://dzone.com/articles/closed-loop-machine-learning-and-real-time-stream
http://www.cs.huji.ac.il/~shais/papers/OLsurvey.pdf
http://www.isn.ucsd.edu/pubs/nips00_inc.pdf
http://www.jmlr.org/papers/volume15/hoi14a/hoi14a.pdf
https://www.cs.cmu.edu/~avrim/Papers/regret-chapter.pdf
https://neo4j.com/blog/real-time-recommendation-engine-data-science/
https://www.slideshare.net/queirozfcom/online-machine-learning-introduction-and-examples
http://ttic.uchicago.edu/~shai/papers/ShalevThesis07.pdf