Besides text generation, what else do you use neural networks for? For example, for validation?

Neural networks are used not only for text generation but also for many other tasks, including data validation. For example, models can be used to check the correctness of entered data, detect anomalies or fraudulent activities. Validation with neural networks is especially useful when validation rules are complex or non-formalizable, such as in image analysis, audio, or complex textual data.

An example of usage: a model can evaluate the quality of uploaded images or check whether the text conforms to a certain style or security requirements. Neural networks are also used for spam classification and filtering, which can be considered a form of validation of incoming messages.