implementation of some optimization algorithms:

1. Steepest Descent.
2. Conjuage Gradient, including Fletcher-Reeves and Polak-Ribiere variant.
3. Quasi-Newton(BFGS).
4. Quasi-Newton(DFP).
5. Quasi-Newton(Limited Memory BFGS).
6. Nesterov's Accelerated Gradient Descent.

For summary of our implementation, see nonlinear_proj.pdf.