FIFTH system for general-purpose connectionist computation
  To date, work on formalizing connectionist computation in a way that is at
least Turing-complete has focused on recurrent architectures and developed
equivalences to Turing machines or similar super-Turing models, which are of
more theoretical than practical significance. We instead develop connectionist
computation within the framework of information propagation networks extended
with unbounded recursion, which is related to constraint logic programming and
is more declarative than the semantics typically used in practical programming,
but is still formally known to be Turing-complete. This approach yields
contributions to the theory and practice of both connectionist computation and
programming languages. Connectionist computations are carried out in a way that
lets them communicate with, and be understood and interrogated directly in
terms of the high-level semantics of a general-purpose programming language.
Meanwhile, difficult (unbounded-dimension, NP-hard) search problems in
programming that have previously been left to the programmer to solve in a
heuristic, domain-specific way are solved uniformly a priori in a way that
approximately achieves information-theoretic limits on performance.
