Feedback networks structured to have memory and a notion of “current” and “past” states, which can encode time (or whatever). Many wheels are re-invented with these, but the essential model is that we have a heavily nonlinear state filter inferred by gradient descent.
The connection with these and convolutional neural networks is suggestive for the same reason.
Many different flavours and topologies. On the border with deep automata.
As someone who does a lot of signal processing for music, the notion that these generalise linear systems theory is suggestive of interesting DSP applications, e.g. generative music.
As seen in normal signal processing/ The main problem here is that they are unstable in the training phase in many of the wild and weird NN SGD phases, unless you are clever.
The main problem here is that they are unstable in the training phase in many of the wild and weird NN SGD phases, unless you are clever. See (Bengio, Simard, and Frasconi 1994). The next three types are proposed solutions for that.
Long Short Term Memory (LSTM)
In a traditional recurrent neural network, during the gradient back-propagation phase, the gradient signal can end up being multiplied a large number of times (as many as the number of timesteps) by the weight matrix associated with the connections between the neurons of the recurrent hidden layer. This means that, the magnitude of weights in the transition matrix can have a strong impact on the learning process. […]
These issues are the main motivation behind the LSTM model which introduces a new structure called a memory cell. […] A memory cell is composed of four main elements: an input gate, a neuron with a self-recurrent connection (a connection to itself), a forget gate and an output gate. […] The gates serve to modulate the interactions between the memory cell itself and its environment.
Gate Recurrent Unit (GRU)
Charming connection with my other research into acoustics, what I would call “Gerzon allpass” filters or orthonormal matrices are useful in neural networks because of favourable normalisation characteristics and general dynamical considerations.
i.e. Kalman fiters, but rebranded in the fine neural networks tradition of taking something uncontroversial from another field and putting the word “neural” in front. Practically these are usually variational, but there are some random sampling based ones.
Long story, bro. Something I meant to follow up because I met a guy in a poster session. Possibly subsumed into attention mechanisms?
Lasagne implementation by Danny Neil.
It’s still the wild west. Invent a category, name it and stake a claim. There’s publications in them thar hills.
TBPTT (truncated back propagation through time), state filters, filter stability.
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