The CHILLIN Prolog code is available via anonymous ftp. See the INDEX file here for details. Pointers to papers on CHILLIN and CHILL can be found on our ILP research page. Below is the standard reference (click on the open book image).
John M. Zelle, Raymond J. Mooney and Joshua B. Konvisser
Proceedings of the Eleventh International Workshop on Machine Learning, pp. 343-351, Rutgers, NJ, July 1994. (ML-94)
This paper describes a new method for inducing logic programs from
examples which attempts to integrate the best aspects of existing ILP
methods into a single coherent framework. In particular, it combines
a bottom-up method similar to GOLEM with a top-down method similar to
FOIL. It also includes a method for predicate invention similar to
CHAMP and an elegant solution to the ``noisy oracle'' problem which
allows the system to learn recursive programs without requiring a
complete set of positive examples. Systematic experimental
comparisons to both GOLEM and FOIL on a range of problems are used to
clearly demonstrate the advantages of the approach.