FullProjAlignPreDSMg#
- class brainpy.dyn.FullProjAlignPreDSMg(pre, delay, syn, comm, out, post, out_label=None, name=None, mode=None)[source]#
Full-chain synaptic projection with the align-pre reduction and delay+synapse updating and merging.
The
full-chain
means that the model needs to provide all information needed for a projection, includingpre
->delay
->syn
->comm
->out
->post
. Note here, compared toFullProjAlignPreSDMg
, thedelay
andsyn
are exchanged.The
align-pre
means that the synaptic variables have the same dimension as the pre-synaptic neuron group.The
delay+synapse updating
means that the projection first delivers the pre neuron output (usually the spiking) to the delay model, then computes the synapse states, and finally computes the synaptic current.The
merging
means that the same delay model is shared by all synapses, and the synapse model with same parameters (such like time constants) will also share the same synaptic variables.Neither
FullProjAlignPreDSMg
norFullProjAlignPreSDMg
facilitates the event-driven computation. This is because thecomm
is computed after the synapse state, which is a floating-point number, rather than the spiking. To facilitate the event-driven computation, please use align post projections.To simulate an E/I balanced network model:
class EINet(bp.DynSysGroup): def __init__(self): super().__init__() ne, ni = 3200, 800 self.E = bp.dyn.LifRef(ne, V_rest=-60., V_th=-50., V_reset=-60., tau=20., tau_ref=5., V_initializer=bp.init.Normal(-55., 2.)) self.I = bp.dyn.LifRef(ni, V_rest=-60., V_th=-50., V_reset=-60., tau=20., tau_ref=5., V_initializer=bp.init.Normal(-55., 2.)) self.E2E = bp.dyn.FullProjAlignPreDSMg(pre=self.E, delay=0.1, syn=bp.dyn.Expon.desc(size=ne, tau=5.), comm=bp.dnn.JitFPHomoLinear(ne, ne, prob=0.02, weight=0.6), out=bp.dyn.COBA(E=0.), post=self.E) self.E2I = bp.dyn.FullProjAlignPreDSMg(pre=self.E, delay=0.1, syn=bp.dyn.Expon.desc(size=ne, tau=5.), comm=bp.dnn.JitFPHomoLinear(ne, ni, prob=0.02, weight=0.6), out=bp.dyn.COBA(E=0.), post=self.I) self.I2E = bp.dyn.FullProjAlignPreDSMg(pre=self.I, delay=0.1, syn=bp.dyn.Expon.desc(size=ni, tau=10.), comm=bp.dnn.JitFPHomoLinear(ni, ne, prob=0.02, weight=6.7), out=bp.dyn.COBA(E=-80.), post=self.E) self.I2I = bp.dyn.FullProjAlignPreDSMg(pre=self.I, delay=0.1, syn=bp.dyn.Expon.desc(size=ni, tau=10.), comm=bp.dnn.JitFPHomoLinear(ni, ni, prob=0.02, weight=6.7), out=bp.dyn.COBA(E=-80.), post=self.I) def update(self, inp): self.E2E() self.E2I() self.I2E() self.I2I() self.E(inp) self.I(inp) return self.E.spike model = EINet() indices = bm.arange(1000) spks = bm.for_loop(lambda i: model.step_run(i, 20.), indices) bp.visualize.raster_plot(indices, spks, show=True)
- Parameters:
pre (
JointType
[DynamicalSystem
,SupportAutoDelay
]) – The pre-synaptic neuron group.syn (
ParamDescriber
) – The synaptic dynamics.comm (
DynamicalSystem
) – The synaptic communication.out (
JointType
[DynamicalSystem
,BindCondData
]) – The synaptic output.post (
DynamicalSystem
) – The post-synaptic neuron group.