[NEST Users] Re: Request for Assistance with Synaptic Weight Normalization

Dear Peter, just a minor addition to Charl's observations: your pseudocode is missing the scaling by the target weight w_target , which is present in the example and may be wanted depending on your application. Best, Barna On 02.12.24 11:44, Charl Linssen wrote: Hi Peter, In the page on weight normalisation ( https://nest-simulator.readthedocs.io/en/v3.8/synapses/weight_normalization…), an example is shown that normalises the L1-norm of the vector. Indeed, it divides by sum(abs(w)). So after the normalisation step, |w| = 1. I don't know where the number 420 comes from, perhaps you can check your code on a more simple example with only one neuron (or send us a minimal reproducing code for the issue). For your second query, please see: https://nest-simulator.readthedocs.io/en/latest/auto_examples/store_restore… Hope this helps! With kind regards, Charl On Sun, Dec 1, 2024, at 21:00, Peter Mason wrote: I am currently working on a project involving synaptic weight normalization using the guidelines provided in the NEST simulator documentation. I have implemented the normalization process; however, I encountered some questions that I would appreciate your insights on. 1. Normalization Value: I found that the normalization value for a neuron with approximately 190 synapses is around 420, which I do not fully understand. This looks like the total weight of the neuron synapses. Could you provide clarification on how the normalisation value is determined? 2. Simulation State Preservation: I would like to save and restore the state of synaptic weights to maintain the simulation's behaviour across sessions. Below is the pseudocode I intend to use: Save synaptic weights: w = array of current weights of neuron connections normalization_factor = sum of absolute weights if normalization_factor != 0: normalized_weights = w / normalization_factor save normalized_weights to file Load synaptic weights: read normalized_weights from file assign loaded weights back to connection I would like to know if you have any suggestions for improving this pseudocode or if there are best practices I should consider. Thank you for your time and assistance. I look forward to your response. _______________________________________________ NEST Users mailing list -- users(a)nest-simulator.org To unsubscribe send an email to users-leave(a)nest-simulator.org _______________________________________________ NEST Users mailing list -- users(a)nest-simulator.org To unsubscribe send an email to users-leave(a)nest-simulator.org -- Barna Zajzon, Postdoctoral Researcher Institute for Advanced Simulation (IAS-6) Computational and Systems Neuroscience Jülich Research Centre, Jülich, Germany ------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------ Forschungszentrum Jülich GmbH 52425 Jülich Sitz der Gesellschaft: Jülich Eingetragen im Handelsregister des Amtsgerichts Düren Nr. HR B 3498 Vorsitzender des Aufsichtsrats: MinDir Stefan Müller Geschäftsführung: Prof. Dr. Astrid Lambrecht (Vorsitzende), Karsten Beneke (stellv. Vorsitzender), Prof. Dr. Ir. Pieter Jansens ------------------------------------------------------------------------------------------------ ------------------------------------------------------------------------------------------------ _______________________________________________ NEST Users mailing list -- users(a)nest-simulator.org To unsubscribe send an email to users-leave(a)nest-simulator.org