Delays

Alireza Nadafian

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Dec 20, 2018, 12:52:38 PM12/20/18

to ANNarchy

Hi.Is there any way to change synaptic delays during simulation ? I mean like weights which can be updated in STDP synapses.

Julien Vitay

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Dec 21, 2018, 5:50:30 AM12/21/18

to Alireza Nadafian, ANNarchy

Hi,

no, delays have to fixed, because we create structures that depend on the maximum delay in a projection.

I do not think it would be possible to change delays from inside the equations, but we could work on allowing it from Python (like `proj.delay = np.array([..])`), under the condition that new delays cannot exceed the maximal value they had at creation. Would that be helpful?

Best

Julien

On Thu, Dec 20, 2018 at 6:52 PM Alireza Nadafian <alirezan...@gmail.com> wrote:

Hi.Is there any way to change synaptic delays during simulation ? I mean like weights which can be updated in STDP synapses.

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Alireza Nadafian

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Dec 21, 2018, 6:35:46 AM12/21/18

to ANNarchy

Actually I suppose it can help cuz then i can simulate and change delays then continue simulating if I am right. :-?

Julien Vitay

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Mar 29, 2019, 7:46:25 AM3/29/19

to ANNarchy

ANNarchy 4.6.7 now allows changing the delays during the simulation (from Python), even if the maximum delay has changed.

Alireza Nadafian

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Mar 31, 2019, 6:47:50 AM3/31/19

to ANNarchy

Is it possible to write an equation to change the delays and share delays in convolution layers ?

Julien Vitay

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Mar 31, 2019, 8:13:47 AM3/31/19

to ANNarchy

No, it is only possible from python. Do you have an example of learning rule for the delays, to see if it is possible?

But I don't think it is possible in a convolution. We plan to improve convolutions in the next release, we will look at it.

Alireza Nadafian

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Mar 31, 2019, 8:32:35 AM3/31/19

to ANNarchy

Yes, I am currently working on one but still looking for a proper dataset to test it. As soon as I checked wether it can learn or not I ll send you the details.
Tnx for respond btw.

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