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The number of active faces function test function is defined as
generate_number_of_active_faces_function(dimensions)
[integer(1)] Size of parameter space.
integer(1)
A soo_function.
soo_function
$$f(x) = \max_{1 \leq i \leq n} \left\{\ln\left(\left|\sum_{i=1}^{n} x_i\right| + 1\right), \ln(|x_i| + 1)\right\}$$
Haarala, M. and Miettinen, K. and Maekelae, M. M., New limited memory bundle method for large-scale nonsmooth optimization.