Machine learning technique for anomaly detection

[khider]

Other methods to consider are described in this article: https://medium.com/@gabrielpierobon/introduction-to-machine-learning-for-anomaly-detection-part-1-2c12d7fa236

Need to have a closer look on how they work.

[khider]

LOF has been implemented in https://github.com/LinkedEarth/Pyleoclim_util/commit/512c92d619ac692b2209f4a600c681db45e1a99e