Adaptive forgetting factor的用法和样例：
- Variable forgetting factor (VFF) can improve the tracking ability of the RLS algorithm.
- System parameters were identified by adapting recursion least square method, and the forgetting factor was introduced to improve the model tracing ability of TCS.
- AR models are built up for positioning sequence based on "sliding window" method.Measuring variance is evaluated through RLS method based on forgetting factor.
- The algorithm introduces twice training of Riemannian geometry’s modifying the kernel function as well as a forgetting factor to decrease the the number of support vectors.