Starting in 2009 with my master thesis, I had variegate experiences related the topic. From natural language processing to supervised and unsupervised learning, progressing in my career I had the chance to face different challenges in machine learning. Got the Coursera certification in 2013 and then intermittently work on the topic until I strongly dedicated my attention to Learning To Rank algorithms and in particular to Lemur project RankLib . I also actively contributed to the Lucene classification module adding auto classification capability to Solr.