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Two-dimensional test function based on the formula $$f(\mathbf{x}) = \sum_{i=1}^{10} \left[2 + 2i - (e^{ix_1} + e^{ix_2})\right]^2$$ with \(\mathbf{x}_1, \mathbf{x}_2 \in [-1, 1]\).
makeJennrichSampsonFunction()
[smoof_single_objective_function]
smoof_single_objective_function
See https://al-roomi.org/benchmarks/unconstrained/2-dimensions/134-jennrich-sampson-s-function.