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Date: 23-9-2021
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The Griewank function is a function widely used to test the convergence of optimization functions. The Griewank function of order is defined by
for (Griewank 1981), plotted above for . It has a global minimum of 0 at the point .
The function has 191 minima, with global minimum at and local minima at for (OEIS A177889), 12.5601, 18.8401, 25.1202, .... Restricting the domain of the function to , the numbers of local minima for for , 2, ... are therefore given by 1, 1, 1, 1, 1, 1, 3, 3, 3, 3, 3, 3, 5, 5, 5, 5, 5, 5, 7, ... (OEIS A178832).
REFERENCES:
Cho, H.; Olivera, F.; and Guikema, S. D. "A Derivation of the Number of Minima of the Griewank Function." Appl. Math. Comput. 204, 694-701, 2008.
Griewank, A. O. "Generalized Decent for Global Optimization." J. Opt. Th. Appl. 34, 11-39, 1981.
Locatelli, M. "A Note on the Griewank Test Function." J. Global Opt. 25, 169-174, 2003.
Sloane, N. J. A. Sequences A177889 and A178832 in "The On-Line Encyclopedia of Integer Sequences."
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