So I would expect, especially in a RankBrain world, Google will be making spam detection and search quality more machine learning based in the near future.

To accomplish this, experiments were conducted on spam dataset downloaded from the UCI machine learning repository which was classified using a popular data mining tool called WEKA.

Google reports Gmail is blocking 100 million extra spam emails per day following the implementation of Tensorflow, its open source, machine-learning framework, to supplement existing spam detection.