BackupAndRestore omits custom callback state and learning-rate schedules
Scope of persisted state The tf.keras.callbacks.BackupAndRestore callback (stable since TensorFlow 2.6) saves model weights, optimizer state, and the epoch counter at each save_freq interval. Restoration loads these artifacts automatically when model.fit() restarts, resuming training from the next epoch. Documented gap Custom callback state, learning-rate sc
keras