Optimization benchmark functions.

All functions are implemented in 30 dimensions and are minimization problems. The optimum is the best solution for the function. The goal for function is used to evaluate the optimization is successful or not. The algorithm is run for 5,000 iterations. If the goal is not met by that time, it is considered that the goal will never be met and the optimization is unsuccessful. and are unimodal functions; and are multimodal functions; is the noise test function and is also unimodal function.