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Talk by Dr. Elena Pastorelli

Instituto Nazionale di Fisica Nucleare (INFN), Sapienza Università di Roma I, Italy

16 May 2017 10:00
16 May 2017
Building 15.22, E1, seminar room 3009

WaveScalES models on NEST

Large scale simulations of the cortical activity investigating slow waves, plasticity, sleep and memory consolidationAnalysis

The WaveScalES experiment, in the framework of the Human Brain Project (HBP), aims to simulate the cortical Slow Waves Activity and the transition toward the Awake state and to match simulations with experimental data acquired on mice and humans. The simulation of spiking neural networks is constituted of bi-dimensional grids of cortical columns, including up to ~50G synapses connecting ~46M neurons, distributed over a set of MPI processes. Distributed simulations have been initially executed on the proprietary DPSNN engine (distributed simulator of plastic spiking neural networks) and are under porting to the NEST simulation engine, with the support of the NEST development group.

In a first step, simulations have been validated comparing (on small problem sizes) the results with simulation executed on a previous generation scalar simulator. In a next future, simulation results will be compared with experimental data, by means of an analysis toolchain (presently based on Matlab) that in a near future, we plan to port to a more standard HBP analysis tools (python/Elephant) and make it available to the HBP community.

In the current presentation, after a brief overview of the WaveScalES research activity in HBP, I will present the neural network models we are developing for the WaveScalES project, their implementation on DPSNN, the first results of the analysis toolchain applied to the simulation outputs and some scaling figures about the scalability of DPSNN up to 1024 MPI processes. Then, I will focus on the porting of the WaveScalES models on the NEST simulator, with an overview of the steps followed for the porting activity, the used tools (NESTML), the problems faced, the future works and related additional requirements needed for their implementation in NEST.

Host: Mr. Dennis Terhorst