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Deep Learning

LSTM

A recurrent cell with gates that decide what to keep and what to forget.

Long short-term memory adds an explicit cell state plus input, forget and output gates. Information can travel a long way down the sequence without being repeatedly multiplied into nothing.

For a decade this was the default for translation, speech and forecasting. Transformers displaced it for language, but it remains a strong and cheap option for modest time-series problems.

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