Table 1.

Description of the hyperparameters included in the search space for the HPO procedure.

Hyperparameter	Description
scale, λ	Steepness of surrogate gradient
time_bin_size	Time binning of the encoded input
nb_input_copies	Copies of the encoded signals provided to the input layer
tau_mem, τmem	Decay time constant of the membrane
tau_ratio	Ratio between the membrane and the synapse (τsyn) decay time constants
fwd_weight_scale	Scaling factor for weight initialization of the forward connections (Wij)
weight_scale_factor	Scaling factor for weight initialization of the recurrent connections (Vij)
reg_neurons, μ1	Scaling factor for the regularization on the number of spikes per neuron
reg_spikes, μ2	Scaling factor for the regularization on the total number of spikes