Fig. 7
From: Early Stopping Criterion for Recursive Least Squares Training of Behavioural Models
Real, Imaginary and Phase components of the change in update matrix, \(\triangle C^{-1} (n)\), as the early stopping criterion is surpassed. The early stopping criterion is shown as a constant 0.25 Radians threshold that indicates instability when exceeded by the phase. Phase was chosen rather than the real or imaginary components as the indicating factor in order to maximise the input training signal length. Let it be noted the limits of this figure have been truncated for aesthetic purposes