Machine Learning Algorithms Implemented in Prolog,
From: http://www.cs.cmu.edu/afs/cs/project/ai-repository/ai/areas/learning/systems/learn_pl/0.html
Many of these don't work in swi-pl yet.
http://en.wikipedia.org/wiki/Timeline_of_artificial_intelligence
1970 - Patrick Winston's PhD program, ARCH, at MIT learned concepts from examples in the world of children's blocks.
http://www.cs.cmu.edu/afs/cs/project/ai-repository/ai/areas/learning/systems/learn_pl/0.html