RNN
An RNN is a mathematical pet that clings desperately to past memories while pretending to predict the future. It boasts a talent for time series data yet stealthily administers gradient disappearance like sugar-coated pills. Mistime its usage and it will run amok; place it appropriately and it will quietly lapse into silence. Developers are tormented by its caprice, and operators live in perpetual fear of mysterious retraining batches.