hxtorch.spiking.functional.refractory

Refractory update for neurons with refractory behaviour

Classes

Unterjubel(*args, **kwargs)

Unterjubel hardware observables to allow correct gradient flow

Functions

hxtorch.spiking.functional.refractory.refractory_update(z: torch.Tensor, v: torch.Tensor, ref_state: torch._VariableFunctionsClass.tensor, spikes_hw: torch.Tensor, membrane_hw: torch.Tensor, *, reset: torch.Tensor, refractory_time: torch.Tensor, dt: float) → Tuple[torch.Tensor, …]

Update neuron membrane and spikes to account for refractory period. This implemention is widly adopted from: https://github.com/norse/norse/blob/main/norse/torch/functional/lif_refrac.py

Parameters

  • z – The spike tensor at time step t.

  • v – The membrane tensor at time step t.

  • ref_state – The refractory state holding the number of time steps the neurons has to remain in the refractory period.

  • spikes_hw – The hardware spikes corresponding to the current time step. In case this is None, no HW spikes will be injected.

  • membrnae_hw – The hardware CADC traces corresponding to the current time step. In case this is None, no HW CADC values will be injected.

  • reset – The reset voltage as torch.Tensor.

  • refractory_time – The refractory time constant as torch.Tensor.

  • dt – Integration step width.

Returns

Returns a tuple (z, v, ref_state) holding the tensors of time step t.