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neurali:sinapsi_predefinite_annarchy [2016/07/07 15:36]
profpro [Sinapsi predefinite ANNarchy]
neurali:sinapsi_predefinite_annarchy [2020/06/08 22:20] (current)
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 +< [[neurali:annarchy]]
 +
 +=====Sinapsi predefinite ANNarchy======
 +
 +http://annarchy.readthedocs.io/en/latest/_modules/ANNarchy/models/Synapses.html
 +
 +[[neurali:spiking_model_annarchy#spiking_synapse|DefaultSpikingSynapse]], STP, STDP, Hebb, Oja, IBCM
 +
 +Sono di tipo rate-coded:
 +  * DefaultSpikingSynapse
 +  * Hebb
 +  * Oja
 +  * IBCM
 +
 +====Default====
 +
 +http://annarchy.readthedocs.io/en/latest/_modules/ANNarchy/core/Projection.html
 +
 +>        By default, the synapse only ensures linear synaptic transmission:
 +>
 +>        * For rate-coded populations: ``psp = w * pre.r``
 +>        * For spiking populations: ``g_target += w`
 +=====STP=====
 +sinapsi di tipo **spinking model** con potenziamento e depressione a breve termine, implementata usando il modelllo di Tsodyks, Markram et al.
 +
 +^ par ^ valore ^ descrizione ^
 +| tau_rec | 100.0 | depression time constant (ms) |
 +| tau_facil | 0.01 | facilitation time constant (ms) |
 +| U | 0.5 | use parameter |
 +
 +time constant of the post-synaptic current, nel modello del neurone...
 +
 +
 +^ var ^ descrizione ^ equazione ^
 +| x | recovery variable | dx/dt = (1 - x)/tau_rec |
 +| u | facilitation variable | du/dt = (U - u)/tau_facil |
 +
 +^ vocabolario ^ valore ^
 +| pre_spike | g_target += w * u * x |
 +| | x *= (1 - u) | 
 +| | u += U * (1 - u)| 
 +
 +=====STDP =====
 +
 +Spike-Timing Dependent Plasticity
 +
 +^ par ^ valore ^ descrizione ^ 
 +| tau_plus | 20.0 | time constant of the pre-synaptic trace (ms) |
 +| tau_minus | 20.0 | time constant of the pre-synaptic trace (ms) |
 +| A_plus | 0.01 | increase of the pre-synaptic trace after a spike |
 +| A_minus | 0.01 | decrease of the post-synaptic trace after a spike |
 +| w_min | 0.0 | minimal value of the weight w |
 +| w_max | 1.0 | maximal value of the weight w |
 +
 +
 +^ var ^ descrizione ^ equazione ^
 +| x | pre-synaptic trace | tau_plus  * dx/dt = -x |
 +| y | post-synaptic trace | tau_minus * dy/dt = -y |
 +
 +^ Vocabolario eventi ^ valore ^
 +| pre_spike | g_target += w |
 +| | x += A_plus * w_max |
 +| | w = clip(w + y, w_min , w_max) |
 +| post_spike | y -= A_minus * w_max |
 +| | w = clip(w + x, w_min , w_max) |
 +
 +
 +
 +
 +
  
neurali/sinapsi_predefinite_annarchy.txt ยท Last modified: 2020/06/08 22:20 (external edit)