AIExplainer
Machine Learning Intermediate 1 min read

What is forget gate?

A component of a long short-term memory (LSTM) neural network that controls the amount of information to forget from previous time steps

The forget gate is a mechanism that helps the neural network decide what information to keep and what to discard, allowing it to focus on the most relevant data

Think of the forget gate like a filter on an email inbox, where it automatically deletes old or irrelevant emails to make room for new and important ones

For example, in a language translation model, the forget gate can help the network forget the context of a previous sentence and focus on the current one

The forget gate is used in LSTMs to prevent the accumulation of irrelevant information and to enable the network to learn from long-term dependencies

A common misconception is that the forget gate completely forgets all previous information, when in fact it selectively forgets and retains relevant information

The concept of the forget gate was introduced in the 1990s by Sepp Hochreiter and Jürgen Schmidhuber as part of the LSTM architecture

forgetting mechanism LSTM forget gate information filter

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