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Random refractory period
by giovannidisarra 18 Aug '20

18 Aug '20

How can I set a random refractory period (different for every neuron) in a population with SetDefaults()?

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Open NEST Developer Video Conference Monday 17 August 2020 11:30 CEST (UTC+2)
by Dennis Terhorst 17 Aug '20

17 Aug '20

Dear NEST Users & Developers! I would like to invite you to our next fortnightly Open NEST Developer Video Conference today Monday 17 August, 11.30-12.30 CEST (UTC+2). In the Project team round, a contact person of each team will give a short statement summarizing ongoing work in the team and cross-cutting points that need discussion among the teams. The remainder of the meeting we would go into a more in-depth discussion of topics that came up on the mailing list or that are suggested by the teams. Agenda Welcome Review of NEST User Mailing List Project team round In-depth discussion The agenda for this meeting is also available online, see https://github.com/nest/nest-simulator/wiki/2020-08-17-Open-NEST-Developer-… Looking forward to seeing you soon! best, Dennis Terhorst ------------------ Log-in information ------------------ We use a virtual conference room provided by DFN (Deutsches Forschungsnetz). You can use the web client to connect. We however encourage everyone to use a headset for better audio quality or even a proper video conferencing system (see below) or software when available. Web client * Visit https://conf.dfn.de/webapp/conference/97938800 * Enter your name and allow your browser to use camera and microphone * The conference does not need a PIN to join, just click join and you're in. In case you see a dfnconf logo and the phrase "Auf den Meetingveranstalter warten", just be patient, the meeting host needs to join first (a voice will tell you). VC system/software How to log in with a video conferencing system, depends on you VC system or software. - Using the H.323 protocol (eg Polycom): vc.dfn.net##97938800 or 194.95.240.2##97938800 - Using the SIP protocol:97938800@vc.dfn.de - By telephone: +49-30-200-97938800 For those who do not have a video conference system or suitable software, Polycom provides a pretty good free app for iOS and Android, so you can join from your tablet (Polycom RealPresence Mobile, available from AppStore/PlayStore). Note that firewalls may interfere with videoconferencing in various and sometimes confusing ways. For more technical information on logging in from various VC systems, please see http://vcc.zih.tu-dresden.de/index.php?linkid=1.1.3.4

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Saving and loading entire network
by LOW, SOCK CHING 05 Aug '20

05 Aug '20

Hi, I am new to pynest and am using it to implement a liquid state machine. It works marvelously for generating the network. My workflow is as follows: - Initialise kernel - Get stimulation episodes - Create neurons (including spike generators) - Connect neurons - nest.Simulate() - nest.GetStatus(recording_neurons) for readout at relevant timepoints I would like to save the network so I can run nest.Simulate() on other episodes in a real-time application, is there a straight-forward way to do so? I have tried pickling conn = nest.GetConnections() but to my knowledge that does not include a lot of details about the connection, like the weight. It also does not return where there is *no* connections, which means simply using nest.SetConnections(conn) prior to nest.Simulate() will not work to reproduce the previously generated network even if I initialise with all the same variables. I have found the functions GetNetwork() and GetNodes() but I'm not sure how I can use them, or if they are even useful for what I need. Cheers, Sock Ching

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Open NEST Developer Video Conference Monday 3 August 2020 11:30 CEST (UTC+2)
by Dennis Terhorst 03 Aug '20

03 Aug '20

Dear NEST Users & Developers! I would like to invite you to our next fortnightly Open NEST Developer Video Conference today Monday 3 August, 11.30-12.30 CEST (UTC+2). In the Project team round, a contact person of each team will give a short statement summarizing ongoing work in the team and cross-cutting points that need discussion among the teams. The remainder of the meeting we would go into a more in-depth discussion of topics that came up on the mailing list or that are suggested by the teams. Agenda Welcome Review of NEST User Mailing List Project team round In-depth discussion The agenda for this meeting is also available online, see https://github.com/nest/nest-simulator/wiki/2020-08-03-Open-NEST-Developer-… Looking forward to seeing you soon! best, Dennis Terhorst ------------------ Log-in information ------------------ We use a virtual conference room provided by DFN (Deutsches Forschungsnetz). You can use the web client to connect. We however encourage everyone to use a headset for better audio quality or even a proper video conferencing system (see below) or software when available. Web client * Visit https://conf.dfn.de/webapp/conference/97938800 * Enter your name and allow your browser to use camera and microphone * The conference does not need a PIN to join, just click join and you're in. In case you see a dfnconf logo and the phrase "Auf den Meetingveranstalter warten", just be patient, the meeting host needs to join first (a voice will tell you). VC system/software How to log in with a video conferencing system, depends on you VC system or software. - Using the H.323 protocol (eg Polycom): vc.dfn.net##97938800 or 194.95.240.2##97938800 - Using the SIP protocol:97938800@vc.dfn.de - By telephone: +49-30-200-97938800 For those who do not have a video conference system or suitable software, Polycom provides a pretty good free app for iOS and Android, so you can join from your tablet (Polycom RealPresence Mobile, available from AppStore/PlayStore). Note that firewalls may interfere with videoconferencing in various and sometimes confusing ways. For more technical information on logging in from various VC systems, please see http://vcc.zih.tu-dresden.de/index.php?linkid=1.1.3.4

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Open NEST Developer Video Conference Monday 20 July 2020 11:30 CEST (UTC+2)
by Dennis Terhorst 20 Jul '20

20 Jul '20

Dear NEST Users & Developers! I would like to invite you to our next fortnightly Open NEST Developer Video Conference today Monday 20 July, 11.30-12.30 CEST (UTC+2). In the Project team round, a contact person of each team will give a short statement summarizing ongoing work in the team and cross-cutting points that need discussion among the teams. The remainder of the meeting we would go into a more in-depth discussion of topics that came up on the mailing list or that are suggested by the teams. Agenda Welcome Review of NEST User Mailing List Project team round In-depth discussion The agenda for this meeting is also available online, see https://github.com/nest/nest-simulator/wiki/2020-07-20-Open-NEST-Developer-… Looking forward to seeing you soon! best, Dennis Terhorst ------------------ Log-in information ------------------ We use a virtual conference room provided by DFN (Deutsches Forschungsnetz). You can use the web client to connect. We however encourage everyone to use a headset for better audio quality or even a proper video conferencing system (see below) or software when available. Web client * Visit https://conf.dfn.de/webapp/conference/97938800 * Enter your name and allow your browser to use camera and microphone * The conference does not need a PIN to join, just click join and you're in. In case you see a dfnconf logo and the phrase "Auf den Meetingveranstalter warten", just be patient, the meeting host needs to join first (a voice will tell you). VC system/software How to log in with a video conferencing system, depends on you VC system or software. - Using the H.323 protocol (eg Polycom): vc.dfn.net##97938800 or 194.95.240.2##97938800 - Using the SIP protocol:97938800@vc.dfn.de - By telephone: +49-30-200-97938800 For those who do not have a video conference system or suitable software, Polycom provides a pretty good free app for iOS and Android, so you can join from your tablet (Polycom RealPresence Mobile, available from AppStore/PlayStore). Note that firewalls may interfere with videoconferencing in various and sometimes confusing ways. For more technical information on logging in from various VC systems, please see http://vcc.zih.tu-dresden.de/index.php?linkid=1.1.3.4

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Open NEST Developer Video Conference Monday 6 July 2020 11:30 CEST (UTC+2)
by Dennis Terhorst 06 Jul '20

06 Jul '20

Dear NEST Users & Developers! I would like to invite you to our next fortnightly Open NEST Developer Video Conference today Monday 6 July, 11.30-12.30 CEST (UTC+2). In the Project team round, a contact person of each team will give a short statement summarizing ongoing work in the team and cross-cutting points that need discussion among the teams. The remainder of the meeting we would go into a more in-depth discussion of topics that came up on the mailing list or that are suggested by the teams. Agenda Welcome Review of NEST User Mailing List Project team round In-depth discussion: Hackathon Wrap-up The agenda for this meeting is also available online, see https://github.com/nest/nest-simulator/wiki/2020-07-06-Open-NEST-Developer-… Looking forward to seeing you soon! best, Dennis Terhorst ------------------ Log-in information ------------------ We use a virtual conference room provided by DFN (Deutsches Forschungsnetz). You can use the web client to connect. We however encourage everyone to use a headset for better audio quality or even a proper video conferencing system (see below) or software when available. Web client * Visit https://conf.dfn.de/webapp/conference/97938800 * Enter your name and allow your browser to use camera and microphone * The conference does not need a PIN to join, just click join and you're in. In case you see a dfnconf logo and the phrase "Auf den Meetingveranstalter warten", just be patient, the meeting host needs to join first (a voice will tell you). VC system/software How to log in with a video conferencing system, depends on you VC system or software. - Using the H.323 protocol (eg Polycom): vc.dfn.net##97938800 or 194.95.240.2##97938800 - Using the SIP protocol:97938800@vc.dfn.de - By telephone: +49-30-200-97938800 For those who do not have a video conference system or suitable software, Polycom provides a pretty good free app for iOS and Android, so you can join from your tablet (Polycom RealPresence Mobile, available from AppStore/PlayStore). Note that firewalls may interfere with videoconferencing in various and sometimes confusing ways. For more technical information on logging in from various VC systems, please see http://vcc.zih.tu-dresden.de/index.php?linkid=1.1.3.4

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How to normalize incoming/outgoing synaptic weights
by Keiko Fujii 29 Jun '20

29 Jun '20

Hello everyone, I would like to ask how to normalize synaptic weights during STDP learning. What I want to do is keeping the total amount of synaptic weights to/from each neuron constant. I try to describe my goal a bit more precisely: i: The index of a pre-synaptic neuron. j: The index of a post-synaptic neuron. w_ij(t): The synaptic weight from i-th neuron to j-th neuron at time=t. s_i(t): the sum of all incoming synaptic weights to i-th neuron at time=t. i.e. the sum of w_ij(t) over j. The goal is to set the sum of incoming weights (s_i(*)) to 1 by normalization (1 is just for simplicity). By STDP, we can get updated synaptic weight matrix w_ij(t+1), and the sum s_i(t+1) is not necessarily 1. So, I want to set w_ij(t+1) <- w_ij(t+1) / s_i(t+1) I briefly read the documentation for synaptic models( https://nest-simulator.readthedocs.io/en/stable/models/synapses.html). I am not very confident if my understanding is correct, but it seems that existing synaptic models handle only one synaptic weight. How can I gather data of all incoming(or outgoing as well) weights to a neuron and use the summation value inside of the STDP synapse model? Best regards, Keiko Fujii

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Error: UnknownModelName
by Allen Rabayda 27 Jun '20

27 Jun '20

Dear Nest Community, Would anyone have insight into why I'm getting an UnknownModelName error? I'm new to Nest and am using Nest 18.0 on Lubuntu Virtual Box (Windows 10 OS). Thanks for any help. Best Regards, --Allen **** Error Message--additional details attached ****** raise exceptionCls(commandname, message) nest.ll_api.UnknownModelName: ('UnknownModelName in CopyModel_l_l_D: /stdp_izh_bitwise_correct_connection is not a known model name. Please check the modeldict for a list of available models.', 'UnknownModelName', <SLILiteral: CopyModel_l_l_D>, ': /stdp_izh_bitwise_correct_connection is not a known model name. Please check the modeldict for a list of available models.') ********************************************************

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Install nest via homebrew
by Tammo Ippen 22 Jun '20

22 Jun '20

Hello nest users with a mac, From now on, it is possible to install nest via homebrew from the default homebrew-core tap: https://formulae.brew.sh/formula/nest#default [1] You get nest 2.20.0 with OpenMP and PyNEST bindings with python 3.8 delivered as a 'bottle' (prebuild binary package) in a couple of seconds - with all dependencies. Go to https://brew.sh/ [2] and follow the installation of homebrew. When brew is installed, just type: brew install nest And you should see something like: $ brew install nest ==> Downloading https://homebrew.bintray.com/bottles/nest-2.20.0_1.catalina.bottle.tar.gz ==> Downloading from https://akamai.bintray.com/38/38bfd492f381cd059a495122d1c3342e8fb5095501c04… ######################################################################## 100.0% ==> Pouring nest-2.20.0_1.catalina.bottle.tar.gz Warning: nest dependency gcc was built with a different C++ standard library (libstdc++ from clang). This may cause problems at runtime. ==> Caveats The PyNEST bindings and its dependencies are installed with the python(a)3.8 formula. If you want to use PyNEST, use the Python interpreter from this path: /usr/local/opt/python(a)3.8/bin You may want to add this to your PATH. ==> Summary 🍺 /usr/local/Cellar/nest/2.20.0_1: 1,290 files, 21.2MB Now you can run nest like: $ nest -- N E S T -- Copyright (C) 2004 The NEST Initiative Version: nest-2.20.0 Built: Jun 22 2020 13:38:00 This program is provided AS IS and comes with NO WARRANTY. See the file LICENSE for details. Problems or suggestions? Visit https://www.nest-simulator.org Type 'help' to get more information. Type 'quit' or press CTRL-D to quit. SLI ] If you want to use PyNEST, you have to use the python(a)3.8 formula python - the dependencies numpy, scipy, etc. are also delivered via homebrew and they are build with the python(a)3.8 formula, which is keg-only [3]. Add the opt-bin path to your PATH variable like: export PATH=/usr/local/opt/python@3.8/bin:$PATH and you can start with: $ python3.8 -c 'import nest' -- N E S T -- Copyright (C) 2004 The NEST Initiative Version: nest-2.20.0 Built: Jun 22 2020 13:38:00 This program is provided AS IS and comes with NO WARRANTY. See the file LICENSE for details. Problems or suggestions? Visit https://www.nest-simulator.org Type 'nest.help()' to find out more about NEST. Best, Tammo Links: ------ [1] https://formulae.brew.sh/formula/nest#default [2] https://brew.sh/ [3] https://docs.brew.sh/How-to-Build-Software-Outside-Homebrew-with-Homebrew-k…

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Feature discussion: STDP and delays
by Dennis Terhorst 22 Jun '20

22 Jun '20

Dear NEST enthusiasts! In the NEST Meeting on May 25th <https://github.com/nest/nest-simulator/wiki/2020-05-25-Open-NEST-Developer-…> [1] there was a very interesting discussion of handling of delays in networks with STDP in NEST. It became obvious, that this topic requires a more in-depth discussion and it was decided to do a separate VC for this discussion, which will happen this week on * Thursday, June 25, 2020 - 13:30 CEST with the connection details <https://github.com/nest/nest-simulator/wiki/Connection-Details> [2] as usual. Best, Dennis [1]: https://github.com/nest/nest-simulator/wiki/2020-05-25-Open-NEST-Developer-… [2]: https://github.com/nest/nest-simulator/wiki/Connection-Details i.e. https://conf.dfn.de/webapp/conference/97938800 -- Dipl.-Phys. Dennis Terhorst Coordinator Software Development Institute of Neuroscience and Medicine (INM-6) Computational and Systems Neuroscience & Theoretical Neuroscience, Institute for Advanced Simulation (IAS-6) Jülich Research Centre, Member of the Helmholz Association and JARA 52425 Jülich, Germany Building 15.22 Room 4004 Phone +49 2461 61-85062 Fax +49 2461 61- 9460 d.terhorst(a)fz-juelich.de ------------------------------------------------------------------------------------- Forschungszentrum Juelich GmbH 52425 Juelich Sitz der Gesellschaft: Juelich Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498 Vorsitzender des Aufsichtsrats: MinDir Volker Rieke Geschaeftsfuehrung: Prof. Dr.-Ing. Wolfgang Marquardt (Vorsitzender), Karsten Beneke (stellv. Vorsitzender), Prof. Dr.-Ing. Harald Bolt -------------------------------------------------------------------------------------

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