RateCodeSpikeGen does not behave correctly when incoming pattern amplitude is higher than 12000

[gkarray]

When RateCodeSpikeGen receives a pattern containing one amplitude that is higher than 12000, the expected behavior would be that the neuron corresponding to that amplitude would spike every time step (saturate).

However, currently, it is not the case. Current behavior is that said neuron will not fire at all.

This is due to the fact that, when computing distances, upon new pattern arrival, we do the following :

distances[idx_non_negligible] = \
            np.rint(TIME_STEPS_PER_MINUTE / pattern[idx_non_negligible])\
            .astype(int)

This would result to distances having a 0 at indices where the pattern is higher than 12000 (since TIME_STEP_PER_MINUTE is set to 6000 right now). 0 representing an infinite distance with the current way RateCodeSpikeGen is implemented, this is not correct.
It should saturate to 1, in that case.