Feature Discussion – STDP and Delays
Thursday, June 25, 2020
In the NEST Meeting on May 25th there was a very interesting discussion of handling of delays in NEST, with focus on STDP models. It became obvious, that this topic requires a more in-depth discussion and it was decided to do a separate VC for this discussion.
Relevant background reading is the following article
- Phenomenological models of synaptic plasticity based on spike timing, Abigail Morrison, Markus Diesmann & Wulfram Gerstner; Biological Cybernetics volume 98, pages 459–478 (May 2008), doi: 10.1007/s00422-008-0233-1
- Slides t.b.a.?
- Brief introduction of key speakers (if necessary)
- Introduction into the topic
- Discussion
- Conclusions
Bruno Golosio presented an overview and current work on a prototype implementation of different handling of delays. The impact on STDP weight updates was investigated and different mechanisms for handling spike event were suggested.
- processing of information on pre- and post-synaptic side distributed to different compute nodes
- effect of the timing of weight updates
- difference of axonal/dendritic delays
- mechanisms of weight normalization
- implementation proposal of spike-buffers
- effect of spike delivery times on the simulation speed
- numeric precision of implementations, GPU vs CPU
- the discussed ideas will be looked at further
- possibilities to realize the implementation also with MPI will be investigated
- we will schedule another meeting in a couple of weeks
