Cortex training example

See https://dzone.com/articles/machine-learning-clojurecortex

To get started:

lein notebook

Training Notebook

http://127.0.0.1:10001/worksheet.html?filename=notebooks/create.clj

Use, plot, Re-train Notebook

http://127.0.0.1:10001/worksheet.html?filename=notebooks/use.clj