https://stats.stackexchange.com/questions/129411/how-can-recurrent-neural-networks-be-used-for-sequence-classification
https://medium.com/@alexrachnog/neural-networks-for-algorithmic-trading-2-1-multivariate-time-series-ab016ce70f57
https://stats.stackexchange.com/questions/127542/convolutional-neural-network-for-time-series
https://www.quora.com/search?q=multivariate+time+series+classification
https://www.quora.com/How-can-I-extract-the-features-from-time-series
https://www.quora.com/How-do-I-classify-and-cluster-multivariate-time-series-sensor-data
https://blog.metaflow.fr/ml-notes-why-the-log-likelihood-24f7b6c40f83