lambda_2

This keyword sets the weight \(\lambda_2\) of the \(\mathcal{L}_2\)-norm regularization term in the loss function. The syntax is:

lambda_2 <weight>

Here, <weight> represents \(\lambda_2\), which can be set to any non-negative values. The default value is \(\lambda_2 = \sqrt{N}/1000\), where \(N\) is the total number of training parameters.