Additional useful algorithms that can be used with spark.

###MLlib #####Outlier Detection Outlier detection on categorical data. By counting frequency scores

#####KNN-Join Approximate KNN-Join which uses z-scores to compute nearest neigbors

###GraphX #####Feedback Vertex Set Greedy recursive solution to find feedback vertex set of a directed graph. #####Watershed Delineation A pregel based functionality to compute vertices which reach out to a given vertex in a DAG