Learning rate scheduler.
callback_learning_rate_scheduler(schedule)
a function that takes an epoch index as input (integer, indexed from 0) and current learning rate and returns a new learning rate as output (float).
Other callbacks: callback_csv_logger
,
callback_early_stopping
,
callback_lambda
,
callback_model_checkpoint
,
callback_progbar_logger
,
callback_reduce_lr_on_plateau
,
callback_remote_monitor
,
callback_tensorboard
,
callback_terminate_on_naan