 at which the callback function will be called. If not specified, the callback will be
called at every step.   lambda_auto_corr (float, optional, defaults to 20.0) —
Lambda parameter to control auto correction   lambda_kl (float, optional, defaults to 20.0) —
Lambda parameter to control Kullback–Leibler divergence output   num_reg_steps (int, optional, defaults to 5) —
Number of regularization loss steps   num_auto_corr_rolls (int, optional, de