(Docs - Concepts) Hyperparameters

[guenthermi]

• explain the batch size and number of epochs
• explain limitations on setting the batch size
• explain the automatic configuration of the batch size and handling of out-of-memory errors because of too high batch sizes
• maybe shortly reference optimizers and loss function sections with the hyperparameters discussed there, e.g.g since optimizer parameters are also considered as hyperparameters