autodiff_library
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Automatic Differentiation Library 
1. Very easy access and light weight c++/c library 
2. Build computation graph as a DAG. 
3. Provide function evaluation, reverse gradient, reverse Hessian-vector, forward Hessian computation calls.
4. State-of-the-art Object-Oriented Design and Implementation in C++ 
5. A modified version of this library is integrated into the Parallel Structured Model Generator(PSMG)--an algebraic modelling langauge for Mathematical Programming.
See project wiki for more detail.
