Summary: Vl Lstm And Recurrent Neural Nets

Read the summary and the most important questions on VL LSTM and Recurrent Neural Nets

• 1 Simpe recurrent networks

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• 1.5 Other RNN learning algorithmes

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• Real-Time recurrent Learning

  Computes all contributions to the gradients during the forward pass , the derivative of each unit with respect to each weigh is tracked

• 4 Transformers and attention

• 4.1.1 temporal attention

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• Temporal attention (for sequences)

  Focuses on relevant elements or intervals of a sequence when processing this sequence

• Playing "soft attention"

  I is in range (0,1) -> since it can laso choose to let through half of the information

• 4.2 Attention in sequence-to-sequence models

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• Bahdanau attention mechanism

  Additive attention ; allows to focus on different parts of the input sequence at a time

• Why the name additive attention

  Becuse of the sum inside the tanh function.

• 11 Script summary

• 11.1 Simple recurrent networks

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• Pred_y = g(x;w)

  Feedforward network = function that maps an input to prediction using network parameters

• idea is Turing compleet

  That every computer program can be represented by the idea

• Jordan network (idea)

  • Earliest recurrent neural architectures
  • 1 hidden layer
  • keep the last ouput as a form of context for processing the next input
    

• Fully recurrent network

  • Elman network + loosen the choice of reccurent parameters
  • add the R^T * a(t-1)
  • treat the R as trainable
  • a hidden unit now depends on itself + neighboring neurons
  • a(0) = 0 <- clean memory
    

• 11.2 Learning algorithmes for RNN's

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• Empirical risk minimization (gradient descent)

  • Input sequence with T elements
  • find a parameterizatoin that minimizes the risk ; argmin Remp(g(.;w))
  • gradient descent : w = w_old - eta * Remp
  • iterate this procedure until the only possible choice is eta = 0 and we converged to a local minimum