tutorials:writing_your_own_plasticity_model
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tutorials:writing_your_own_plasticity_model [2016/08/18 16:40] – [Changing the plasticity model] zenke | tutorials:writing_your_own_plasticity_model [2018/02/07 23:03] – [Synaptic traces] typo fix zenke | ||
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* Zenke, F., and Gerstner, W. (2014). Limits to high-speed simulations of spiking neural networks using general-purpose computers. Front Neuroinform 8, 76. [[http:// | * Zenke, F., and Gerstner, W. (2014). Limits to high-speed simulations of spiking neural networks using general-purpose computers. Front Neuroinform 8, 76. [[http:// | ||
- | If you can write down a learning rule as a differential equation involving spike trains, synaptic traces and specific postsynaptic quantities, such as the membrane potential, Auryn will bring everything need to so so intuitively. Here is an example from Gerstner and Kistler (2002): | + | If you can write down a learning rule as a differential equation involving spike trains, synaptic traces and specific postsynaptic quantities, such as the membrane potential, Auryn will bring everything |
{{ : | {{ : | ||
- | In Auryn you can implement this type of learning rule very intuitively | + | In Auryn you can implement this type of learning rule if the '' |
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===== Understanding plasticity in Auryn ===== | ===== Understanding plasticity in Auryn ===== | ||
- | Before writing | + | In most cases you will want to use Auryn to implement |
- | + | ||
- | In most cases it will be best to writing your own synapse model, by modifying an existing model (like [[examples:sim_background|Triplet STDP]]) which already | + | |
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The macros '' | The macros '' | ||
- | This declaration should be matched in the '' | + | This declaration should be matched in the '' |
<code c++> | <code c++> | ||
/* Initialization of presynaptic traces */ | /* Initialization of presynaptic traces */ | ||
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tr_post_hom = dst-> | tr_post_hom = dst-> | ||
</ | </ | ||
- | which initializes the traces using their respective | + | which initializes the traces using their respective |
- | + | ||
- | The current value of a trace can then be accessed in the code via '' | + | |
==== Weight updates at spiking events (propagate) ==== | ==== Weight updates at spiking events (propagate) ==== | ||
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return dw; | return dw; | ||
</ | </ | ||
- | The code describes how each weight should be updated upon a presynaptic spike (hence the suffix). Since spikes in Auryn are labelled | + | The code describes how each weight should be updated upon a presynaptic spike (hence the suffix). Since spikes in Auryn are labeled |
The complete weight update '' | The complete weight update '' | ||
- | This describes | + | One thing you should pay close attention to, because it could might easily introduce errors: **You need to translate postsynaptic IDs (as shown above)**, but not the presynaptic ones! Copies of presynaptic trances are available on each rank, whereas postsynaptic traces are distributed with the neuronal dynamics. This only makes a difference when you are running simulations in parallel with MPI, but then it's an important difference. |
+ | |||
+ | We now covered weight updates triggered by presynaptic spikes, but what happens upon a postsynaptic spike? | ||
=== Backward spike propagation === | === Backward spike propagation === | ||
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===== Changing the plasticity model ===== | ===== Changing the plasticity model ===== | ||
- | Suppose, you would like to change the plasticity model, all you need to do is to copy TripletConnection.h and TripletConnection.cpp to YourNameConnection.h and .cpp and then the '' | + | Most of the plasticity models in Auryn follow the design principles introduced above (e.g. http:// |
- | One thing you should pay attention to, because it could might easily introduce errors: You need to translate postsynaptic IDs (as shown above), but not the presynaptic ones! Copies of presynaptic trances are available on each rank, whereas postsynaptic traces are distributed with the neuronal dynamics. This only makes a difference when you are running simulations in parallel with MPI, but then it's an important difference. | ||
==== Weight updates in continuous time (evolve) ==== | ==== Weight updates in continuous time (evolve) ==== |
tutorials/writing_your_own_plasticity_model.txt · Last modified: 2018/02/07 23:11 by zenke