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A symbolic framework for C++, Python and Octave implementing automatic differentiation by source code transformation in forward and reverse modes on sparse matrix-valued computational graphs.
Rensselaer's Optimistic Simulation System, or ROSS, is a parallel discrete event simulator employing optimistic synchronization for multiple processors. ROSS has demonstrated scalability to 131,072 processors. ROSS implements reverse computation.
Bidirectional computer, bicomp, is a virtual machine designed to aid in the research of complexity. bicomp runs its programs in forward or reverse. The program either produces a result from two inputs, or a list of possible inputs given a result.