Dear All,
     In tested a model that uses several calls to GetConnections for wiring multiple receptors. I tested it in 2.18 and 2.20, with different master seeds.  The results are consistent.
     However, I would like to understand the meaning of that “warning”.
      Thanks, Carlos.


On Wed, Feb 26, 2020 at 18:49 Carlos Gutierrez <carlosengutierrez@gmail.com> wrote:
Dear All,
    I am experiencing the same issue changing from NEST 2.18 to 2.20.
    Apparently is an error masked as a "warning".
    I was reading the release notes -->> https://github.com/nest/nest-simulator/releases/tag/v2.20.0
    and there is a fix for GetConnections  -->> https://github.com/nest/nest-simulator/pull/1251
    Probably an error was introduced in that change.
Please can you help.
Regards, Carlos.

On Thu, Feb 20, 2020 at 9:57 PM Lea Steffen <steffen@fzi.de> wrote:

Hi everybody,


I switched from Nest 2.16 to 2.20 and now I get this warning message:


ConnectionManager [Warning]: 
    New connections created, connection descriptors previously obtained using 
    'GetConnections' are now invalid

 

This happens at several parts in my code while building synapses with 'sim.Projection(...)'. I use a 'FromListConnector' and  'STDPMechanism' as synapse_type. 


I neversaw this warning in the previous Nest version, is it something to be concerned about?


I am not quite sure what it is trying to tell me.



Thanks in advance, Lea

.........................................................
M. Sc. Lea Steffen
Wissenschaftlicher Mitarbeiter | Research Scientist
Intelligent Systems and Production Engineering (ISPE)
Interactive Diagnosis and Service Systems (IDS)

FZI Forschungszentrum Informatik
Haid-und-Neu-Str. 10–14 
76131 Karlsruhe, Germany
Tel.: +49 721 9654-218

steffen@fzi.de
www.fzi.de/mitarbeiter/steffen
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FZI Forschungszentrum Informatik am Karlsruher Institut für Technologie
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