of the L2H framework. If the adaptivity mechanism is working, the algorithm should reach the global minimum (zero) rapidly and smoothly. F3 (Schwefel’s Problem 2.21):

In the context of L2H for adaptivity, F1, F3, and F5 refer to specific frequency bands in the frequency domain representation of the input data. These frequency bands are used to analyze the input data and generate a more adaptable representation.

This is the master switch for the adapter's adaptive capabilities. It has three states: