Dictionary descent in optimization


The problem of convex optimization is studied. Usually in convex optimization the minimization is over a d-dimensional domain. Very often the convergence rate of an optimization algorithm depends on the dimension d. The algorithms studied in this paper utilize dictionaries instead of a canonical basis used in the coordinate descent algorithms. We show how this approach allows us to reduce dimensionality of the problem. Also, we investigate which properties of a dictionary are beneficial for the convergence rate of typical greedy-type algorithms.

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Correspondence to V. N. Temlyakov.

Additional information

Research was supported by NSF grant DMS-1160841.

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Temlyakov, V.N. Dictionary descent in optimization. Anal Math 42, 69–89 (2016). https://doi.org/10.1007/s10476-016-0106-0

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Key words and phrases

  • sparse
  • optimization
  • greedy
  • Banach space
  • convergence rate

Mathematics Subject Classification

  • primary 41A46
  • secondary 65K05, 41A65, 46B20