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Understanding RNN and LSTM

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My weekly report on RNN

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Understanding RNN and LSTM

  1. 1. RNN and LSTM (Oct 12, 2016) YANG Jiancheng
  2. 2. Outline • I. Vanilla RNN • II. LSTM • III. GRU and Other Structures
  3. 3. • I. Vanilla RNN In theory, RNNs are absolutely capable of handling such “long- term dependencies.” A human could carefully pick parameters for them to solve toy problems of this form. Sadly, in practice, RNNs don’t seem to be able to learn them. GREAT Intro: Understanding LSTM Networks
  4. 4. • I. Vanilla RNN WILDML has a series of articles to introduce RNN (4 articles, 2 GitHub repos).
  5. 5. • I. Vanilla RNN • Back Prop Through Time (BPTT)
  6. 6. • I. Vanilla RNN • Back Prop Through Time (BPTT)
  7. 7. • I. Vanilla RNN • Gradient Vanishing Problem tanh and derivative. Source: http://nn.readthedocs.org/en/rtd/transfer/ RNNs tend to be very deep
  8. 8. • II. LSTM • Differences of LSTM and Vanilla RNN
  9. 9. • II. LSTM • Core Idea Behind LSTMs Cell state Gates
  10. 10. • II. LSTM • Step-by-Step Walk Through 0 ~ 1 0 ~ 1
  11. 11. • II. LSTM • Step-by-Step Walk Through 0 ~ 1 0 ~ 1
  12. 12. • III. GRU and other structures • Gated Recurrent Unit (GRU) • Combines the forget and input gates into a single “update gate.” • Merges the cell state and hidden state • Other changes
  13. 13. • III. GRU and other structures • Variants on Long Short Term Memory Greff, et al. (2015) do a nice comparison of popular variants, finding that they’re all about the same.
  14. 14. Bibliography • [1] Understanding LSTM Networks • [2] Back Propagation Through Time and Vanishing Gradients
  15. 15. Thanks for listening!

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