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<!-- navigation toc: --> <li><a href="#___sec0" style="font-size: 80%;">Recurrent neural networks: Overarching view</a></li>
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<h2 id="___sec0" class="anchor">Recurrent neural networks: Overarching view </h2>
<p>
Till now our focus has been, including convolutional neural networks
as well, on feedforward neural networks. The output or the activations
flow only in one direction, from the input layer to the output layer.
<p>
A recurrent neural network (RNN) looks very much like a feedforward
neural network, except that it also has connections pointing
backward.
<p>
RNNs are used to analyze time series data such as stock prices, and
tell you when to buy or sell. In autonomous driving systems, they can
anticipate car trajectories and help avoid accidents. More generally,
they can work on sequences of arbitrary lengths, rather than on
fixed-sized inputs like all the nets we have discussed so far. For
example, they can take sentences, documents, or audio samples as
input, making them extremely useful for natural language processing
systems such as automatic translation and speech-to-text.
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<b>The text here is under development</b>. Planned finished mid Jan 2020.
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