data_mining:neural_network:types

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data_mining:neural_network:types [2017/08/13 11:50] – [Recurrent NN] phreazerdata_mining:neural_network:types [2019/10/26 12:09] (current) – ↷ Links adapted because of a move operation phreazer
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 ====== Types of NNs ====== ====== Types of NNs ======
 +===== Perceptron ===== 
 +See [[data_mining:neural_network:perceptron|Perceptron]]
 ===== Feed-forward NN ===== ===== Feed-forward NN =====
 First layer is input, last layer output, hidden layers inbetween. First layer is input, last layer output, hidden layers inbetween.
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   * Harder to train   * Harder to train
  
-Natural for modelling sequential data:+Natural for modeling sequential data:
   * Equivalent to very deep nets with one hidden layer per time slice, except that they use same weights at every time sclice and get input at very time slice.   * Equivalent to very deep nets with one hidden layer per time slice, except that they use same weights at every time sclice and get input at very time slice.
   * Can rember info in the hidden state for a long time.   * Can rember info in the hidden state for a long time.
  
 +See [[data_mining:neural_network:sequences:sequence_learning|Sequence learning]]
 ===== Symmetrically connected NN ===== ===== Symmetrically connected NN =====
  
-Like RNN, but connections between units are symmetrical (same weigth in both directions).+Like RNN, but connections between units are symmetrical (same weigths in both directions)
 + 
 +  * Easier to analyze 
 +  * Restricted: Cannot model cycles  
 +  * "Hopfield nets" if they have no hidden layer.
  
-- Easier to analyze +===== Convolutional NN ===== 
-- RestrictedCannot model cycles  +See [[data_mining:neural_network:cnn:cnn|Convolutional neural network]]
-"Hopfield nets" if they have no hidden layer.+
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