What is the purpose of the forget gate in an LSTM?

Practice Questions

Q1
What is the purpose of the forget gate in an LSTM?
  1. To decide what information to keep from the previous cell state.
  2. To determine the output of the LSTM.
  3. To initialize the cell state.
  4. To control the input to the cell state.

Questions & Step-by-Step Solutions

What is the purpose of the forget gate in an LSTM?
  • Step 1: Understand that an LSTM (Long Short-Term Memory) is a type of neural network used for processing sequences of data.
  • Step 2: Recognize that LSTMs have different components, one of which is the forget gate.
  • Step 3: The forget gate looks at the previous cell state and the current input.
  • Step 4: It uses a mathematical function (sigmoid) to decide which information to keep and which to discard.
  • Step 5: The output of the forget gate is a number between 0 and 1 for each piece of information.
  • Step 6: A value of 0 means 'forget this information' and a value of 1 means 'keep this information'.
  • Step 7: This helps the LSTM to focus on relevant information and ignore what is not needed.
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