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Open NEST Developer Video Conference Monday Oct 10 2022 11:30 CEST (UTC+2)
by Dennis Terhorst 10 Oct '22

10 Oct '22

Dear NEST Users & Developers! I would like to invite you to our next fortnightly Open NEST Developer Video Conference, today Monday October 10, 11.30-12.30 CEST (UTC+2). Feel free to join the meeting also if it's just to bring your own questions for direct discussion in the in-depth section. Special topic for the in-depth discussion for today is the /NEST implementation of eligibility propagation/. As usual, 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/2022-10-10-Open-NEST-Developer-… Looking forward to seeing you again soon! Cheers, 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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Assertion error during connection when using CopyModel and own neuron model
by Barna Zajzon 07 Oct '22

07 Oct '22

Dear all, I'm encountering the following error python: /home/zbarni/software/packages/nest/znest/nestkernel/model_manager.h:296: nest::Model* nest::ModelManager::get_node_model(nest::index) const: Assertion `m < node_models_.size()' failed. when using the following code: nest.SetKernelStatus({'total_num_virtual_procs':16, 'local_num_threads':16}) nest.Install('my_neuron_module') for iin range(16): nest.CopyModel('MyNeuron', f'MyNeuron_{i}') neurons = nest.Create('MyNeuron_0', 2) nest.Connect(neurons, neurons) The script uses a neuron model that I wrote in C++ and is loaded without errors. The error is thrown upon nest.Connect(), and goes away if I create the neurons using `MyNeuron` and not `MyNeuron_x` (copied) or if the #vp and #threads is 1. I've used the model with NEST 2.20.0 without problems, but I'd like to port the code to the latest version. Maybe I'm just missing something new functionality/API related to CopyModel and multiprocessing - have there been any critical changes in the model requirements? Any help would be greatly appreciated. Barni

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NEST, CMake, Xcode, Eclipse & Co: the magic -G
by Hans Ekkehard Plesser 07 Oct '22

07 Oct '22

Dear NEST Developers, I would like to share some insights I gained over the last few days concerning NEST and IDEs. As you might know, we have some instructions for how to use NEST with IDEs (https://nest-simulator-sg.readthedocs.io/en/latest/developer_space/workflow…), but these instructions are at best complicated and at worst awfully outdated. I now discover the magic -G flag for CMake (https://cmake.org/cmake/help/latest/manual/cmake-generators.7.html), where CMake does all the heavy configuration lifting for you. Proceed as follows: - Create a build directory - Prepare your normal cmake invocation and add - for XCode: -GXcode - for Eclipse: -G"Eclipse CDT4 - Unix Makefiles" - Then open the build directory in XCode or Eclipse For other build systems, run cmake –help and see if your system is listed. Unfortunately, VSCode seems unsupported at the moment. In Xcode, you can then choose the "install" target and run it to build NEST and afterwards the "nest" target to run nest—and it will stop in the debugger if you just set a breakpoint or something goes wrong. There are still a few problems, and if any of you have more experience than me with setting up Xcode or Eclipse problems, we can maybe work it out together: 1. In Eclipse, the project will only include files in the build directory, not the source code. How to fix that? 2. Xcode * Files are ordered a bit strangely (subfolders for headers and non-headers) and "libnestutil" is shown as "nestutil" in the folder list * The "installcheck" target does not work because Xcode runs everything in the conda "base" environment—how to either force a "conda activate nest" before each run or explicitly set PYTHONPATH? * I have not yet found out how to run PyNEST from Xcode, which would also depend on conda activate/Pythonpath setting Once we have a little more experience, I will prepare a PR to update the IDE instructions. Best, Hans Ekkehard -- Prof. Dr. Hans Ekkehard Plesser Head, Department of Data Science Faculty of Science and Technology Norwegian University of Life Sciences PO Box 5003, 1432 Aas, Norway Phone +47 6723 1560 Email hans.ekkehard.plesser(a)nmbu.no<mailto:hans.ekkehard.plesser@nmbu.no> Home http://arken.nmbu.no/~plesser

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using mpi4py with nest | parallel write to a file
by Aadhar Sharma 28 Sep '22

28 Sep '22

Hi there! I am using the structural plasticity module to simulate large-scale networks on HPC. The way I run these simulations with MPI creates a large number of small data files (.npy) which I organize into a HDF5 file in a post hoc manner. This has hitherto not been a problem, however, I recently increased the size of my simulations and the number of files that I create exceeds my HPCinode quota. So, I have to come up with a way of handling all these files or the way I export them. Ideally, I would like to concurrently write to a file (like zarr) with multiple processes. However, parallel zarr writes are only optimal when the chunk size are uniform. For me, they are not uniform---so, I abandoned the idea of using zarr. Currently, I am trying to use mpi4py to gather the data I want and save it through a mother MPI process. I ran some test simulations and all was fine (see attached script). However, when I use structural plasticity with mpi4py I get an error that: "nest.lib.hl_api_exceptions.DimensionMismatch: ('DimensionMismatch in SetStatus_id: Expected dimension size: 1\nProvided dimension size: 20', 'DimensionMismatch', <SLILiteral: SetStatus_id>, ': Expected dimension size: 1\nProvided dimension size: 20". I believe that mpi4py somehow interferes with nest's internal mpi mechanism. Perhaps it signals nest kernel to use 1 process rather than the mentioned 20. If I remove the mpi4py import call, all works fine. So, I cannot run the simulation using this mpi4py hack. Do you notice something wrong with my approach? I'm just beginning to use mpi4py, so I may be missing something here. Alternatively, could you recommend a way to reduce the number of exported files. For example, through zarr or other file formats which support parallel writes. I'd appreciate any suggestions. Thanks! pyNEST version: 2.20.2 python version: Python 3.7.10 mpiexec/mpirun version: MPI Library for Linux* OS, Version 2021.3 Best, Ady

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[Precise Spikes]small bug in ./pynest/examples/hpc_benchmark.py (nest-3.3)
by Tianxiang Lyu 26 Sep '22

26 Sep '22

Hi, all! I try to replace "iaf_psc_alpha" with "iaf_psc_alpha_ps" and "poisson_generator" with "poisson_generator_ps" for using precise spikes neuron template in the simulation However, there are somethings wrong with the logs related to SLI with which I hadn't been familiar: (If the randomizing of membrane potentials is removed, hpc_benchmark.py could run as usual) Traceback (most recent call last): File "./hpc_benchmark.py", line 456, in <module> run_simulation() File "./hpc_benchmark.py", line 362, in run_simulation sr = build_network(logger) File "./hpc_benchmark.py", line 227, in build_network nest.GetLocalNodeCollection(E_neurons).V_m = random_vm File "/GPUFS/sysu_hpcedu_302/lvtx/tools/nest-simulator/3.3-intel-2021/lib64/python3.8/site-packages/nest/lib/hl_api_types.py", line 543, in __setattr__ self.set({attr: value}) File "/GPUFS/sysu_hpcedu_302/lvtx/tools/nest-simulator/3.3-intel-2021/lib64/python3.8/site-packages/nest/lib/hl_api_types.py", line 477, in set sli_func('SetStatus', self._datum, params) File "/GPUFS/sysu_hpcedu_302/lvtx/tools/nest-simulator/3.3-intel-2021/lib64/python3.8/site-packages/nest/ll_api.py", line 165, in sli_func sli_run(slifun) # SLI support code to execute s on args File "/GPUFS/sysu_hpcedu_302/lvtx/tools/nest-simulator/3.3-intel-2021/lib64/python3.8/site-packages/nest/ll_api.py", line 115, in catching_sli_run raise exceptionCls(commandname, message) nest.lib.hl_api_exceptions.TypeMismatch: TypeMismatch in SLI function SetStatus_id: Expected datatype: doubletype Provided datatype: parametertype How could I fix that? Or another way to implement randomizing of membrane potentials? Tianxiang Lyu Department of Mechanic Sun Yet-Sen University No. 66, Gongchang Road, Guangming District, Shenzhen, 518107, P. R. China

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Open NEST Developer Video Conference Monday Sep 26 2022 11:30 CEST (UTC+2)
by Dennis Terhorst 26 Sep '22

26 Sep '22

Dear NEST Users & Developers! I would like to invite you to our next fortnightly Open NEST Developer Video Conference, today Monday September 26, 11.30-12.30 CEST (UTC+2). Feel free to join the meeting also if it's just to bring your own questions for direct discussion in the in-depth section. As usual, 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/2022-09-26-Open-NEST-Developer-… Looking forward to seeing you again soon! Cheers, 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 save and reload an already trained network created with Nest Simulator?
by salvatore.taffara＠phd.unict.it 21 Sep '22

21 Sep '22

Hi, can anyone answer to my question in subject? I am using Nest 3.3. Thanks in advance, Salvo

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which neuron model supports shunting inhibition
by Aadhar Sharma 14 Sep '22

14 Sep '22

Hi all! I want to use investigate the effects of shunting inhibition in one of my experiments. I tried iaf_cond_alpha, but couldn't reproduce the shunting effect. Could someone please suggest which neuron model to use? There should be a way to also change the V_th, V_rest, C_m, tau_m or g_L for this model. I am working with NEST 2.20.2 Best, Ady

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Open NEST Developer Video Conference Monday Aug 15 2022 11:30 CEST (UTC+2)
by Dennis Terhorst 12 Sep '22

12 Sep '22

Dear NEST Users & Developers! I would like to invite you to our next fortnightly Open NEST Developer Video Conference, today Monday August 15, 11.30-12.30 CEST (UTC+2). Feel free to join the meeting also if it's just to bring your own questions for direct discussion in the in-depth section. As usual, 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/2022-08-15-Open-NEST-Developer-… Looking forward to seeing you again soon! Cheers, 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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Upcoming conference in Computational Neuroscience - Neuromatch 2022
by Alberto Antonietti 30 Aug '22

30 Aug '22

Dear NEST users and developers, I am glad to invite you to the upcoming fifth edition of the Neuromatch Conference (NMC), which will take place online on September 27-28! The scope of NMC 2022 includes computational neuroscience and machine learning work that has a biological link. We are excited to have a slate of excellent speakers and panelists lined up including: - Keynotes from Larry Abbott, Rosa Chan, Ida Momennejad and Mac Shine - Panel on spiking computation: Priya Panda, Katie Schuman, and Peter Suma - Panel on the future of scientific publishing: Tim Behrens, Simine Vazire, and Abeni Wickham - Bridging-the-gap with computational psychiatry: Xiaosi Gu and Quentin Huys Registration costs are set at 15 USD to cover technical costs, and if this is a difficulty, the fee can be waived without questions. **Important dates** September 5, 2022: Abstract submission deadline September 7, 2022: Abstract acceptance and live talk selection news September 22, 2022: Video submission deadline for flashtalks September 27 - 28, 2022: NMC 2022 Each of the two conference days will have two sessions, each of which is 4 hours long. Here are the hours for each of the sessions, as they would occur across five time zones from around the world: Read more at http://conference.neuromatch.io I hope to see many of you there! Best, Alberto

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