An interior-point algorithm for linear optimization based on a new barrier function

Primal-dual interior-point methods (IPMs) are the most efficient methods for a computational point of view. At present the theoretical iteration bound for small-update IPMs is better than the one for large-update IPMs. However, in practice, large-update IPMs are much more efficient than small-update IPMs. Peng et al. [14,15] proposed new variants of IPMs based on self-regular barrier functions and proved so far the best known complexity, e.g. Onlognlognϵ, for large-update IPMs with some specific self-regular barrier functions. Recently, Roos et al. [2-9] proposed new primal-dual IPMs based on various barrier functions to improve the iteration bound for large-update methods from Onlognϵ to Onlognlognϵ. Motivated by their works we define a new barrier function and propose a new primal-dual interior point algorithm based on this function for linear optimization (LO) problems. We show that the new algorithm has Onlognlognϵ iteration bound for large-update and Onlognϵ for small-update methods which are currently the best known bounds, respectively.