Сколько ячеек LSTM я должен использовать?

Существуют ли какие-либо практические правила (или фактические правила), касающиеся минимального, максимального и «разумного» количества ячеек LSTM, которые я должен использовать? В частности, я имею в виду BasicLSTMCell из TensorFlow и num_unitsсвойства. Пожалуйста, предположите, что у меня есть...

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