Spaces:
Sleeping
Sleeping
File size: 2,512 Bytes
3d46076 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 | #version 450
layout(local_size_x = 64, local_size_y = 1, local_size_z = 1) in;
layout(std430, binding = 0) readonly buffer RowOffsets {
int row_offsets[];
};
layout(std430, binding = 1) readonly buffer ColIndices {
int col_indices[];
};
layout(std430, binding = 2) readonly buffer Weights {
float weights[];
};
layout(std430, binding = 3) readonly buffer PrevSpikes {
float prev_spikes[];
};
layout(std430, binding = 4) readonly buffer ExternalInputs {
float external_inputs[];
};
layout(std430, binding = 5) readonly buffer PotentialsIn {
float potentials_in[];
};
layout(std430, binding = 6) readonly buffer RefractoryIn {
int refractory_in[];
};
layout(std430, binding = 7) writeonly buffer PotentialsOut {
float potentials_out[];
};
layout(std430, binding = 8) writeonly buffer SpikesOut {
float spikes_out[];
};
layout(std430, binding = 9) writeonly buffer RefractoryOut {
int refractory_out[];
};
layout(std430, binding = 10) readonly buffer Params {
int num_neurons;
float decay;
float threshold;
float v_reset;
float v_rest;
int t_ref;
} params;
void main() {
uint i = gl_GlobalInvocationID.x;
if (i >= uint(params.num_neurons)) {
return;
}
int ref_count = refractory_in[i];
if (ref_count > 0) {
// Absolute refractory period: clamp to reset potential, suppress spike
refractory_out[i] = ref_count - 1;
potentials_out[i] = params.v_reset;
spikes_out[i] = 0.0;
return;
}
// Accumulate synaptic current from presynaptic spikes
int start_idx = row_offsets[i];
int end_idx = row_offsets[i + 1];
float synaptic_sum = 0.0;
for (int k = start_idx; k < end_idx; ++k) {
int pre_idx = col_indices[k];
synaptic_sum += weights[k] * prev_spikes[pre_idx];
}
float v_old = potentials_in[i];
// Leaky integration towards resting potential
float v_cand = params.v_rest + (v_old - params.v_rest) * params.decay + synaptic_sum + external_inputs[i];
if (v_cand >= params.threshold) {
// Threshold crossed: fire action potential (spike), reset membrane, initiate refractory period
spikes_out[i] = 1.0;
potentials_out[i] = params.v_reset;
refractory_out[i] = params.t_ref;
} else {
// Subthreshold: decay potential, no spike, clamp to floor
spikes_out[i] = 0.0;
potentials_out[i] = max(v_cand, params.v_reset - 1.0);
refractory_out[i] = 0;
}
}
|