21. A non-transitory computer-readable storage medium, storing program instructions computer-executable on a computer to implement a genetic rule generator configured to: perform one or more machine learning operations on a set of seed rules to generate a new set of rules for determining whether a given pair of information items have a specific relationship, wherein the set of seed rules comprises one or more rules resulting from one or more previously performed machine learning operations, wherein: the one or more previously performed machine learning operations were performed in regard to a set of information items including one or more differences from another set of information items used in generating the new set of rules, or the specific relationship is different than another specific relationship for which the new set of rules was generated; and apply the new set of rules to one or more pairs of information items to identify at least one pair of information items as having the specific relationship.
21. A non-transitory computer-readable storage medium, storing program instructions computer-executable on a computer to implement a genetic rule generator configured to: perform one or more machine learning operations on a set of seed rules to generate a new set of rules for determining whether a given pair of information items have a specific relationship, wherein the set of seed rules comprises one or more rules resulting from one or more previously performed machine learning operations, wherein: the one or more previously performed machine learning operations were performed in regard to a set of information items including one or more differences from another set of information items used in generating the new set of rules, or the specific relationship is different than another specific relationship for which the new set of rules was generated; and apply the new set of rules to one or more pairs of information items to identify at least one pair of information items as having the specific relationship. 28. The non-transitory computer readable storage medium of claim 21 , wherein a requisite time to perform the one or more machine learning operations on the set of seed rules to generate the new set of rules is less than a requisite time to generate the new set of rules from a set entirely comprised of randomly or pseudo-randomly generated rules.