Regarding “clickbaity”, I clicked it hoping to hear about some interesting way to apply the concept of depth first search to machine learning. The actual subject, however, has nothing to do with depth first search: depth vs. breadth first has to do with the order in which links are traversed, but what the author wants is for machine learning to discover links it currently doesn’t know about at all (i.e. explicit textual references). However, this probably isn’t intentional clickbait; the author probably thought the analogy made sense. (Maybe it does somehow and I’m just not seeing it.)