Spires feeding into SPICE crossbar

1 files changed, 218 insertions, 0 deletions

diff --git a/src/spires_interface_test.c b/src/spires_interface_test.c
new file mode 100644
index 0000000..ef2dabc
--- /dev/null
+++ b/src/spires_interface_test.c
@@ -0,0 +1,218 @@
+#include "spires_interface.h"
+#include "crossbar_generator.h"
+
+#include <math.h>
+#include <spires.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <plplot/plplot.h>
+
+#define NUM_NEURONS 400
+#define NUM_INPUTS 4
+#define NUM_OUTPUTS 2
+#define NUM_TRAINING_STEPS 500
+
+#define PI 3.14159265358979323846
+
+static int plot_raster(
+    const Reservoir_State_Matrix *matrix,
+    size_t neurons_to_plot,
+    double spike_threshold
+); 
+
+int main(void) {
+    //discrete LIF parameters
+    double lif_config[] = {
+        0.0, //V_off
+        1.0, //V_th
+        0.2, //leak rate
+        0.5, //bias
+    };
+
+    const spires_reservoir_config config = {
+        .num_neurons = NUM_NEURONS,
+        .num_inputs = NUM_INPUTS,
+        .num_outputs = NUM_OUTPUTS,
+        .spectral_radius = 0.95,
+        .ei_ratio = 0.8,
+        .input_strength = 0.1,
+        .connectivity = 0.1,
+        .dt = 1.0,
+        .connectivity_type = SPIRES_CONN_RANDOM,
+        .neuron_type = SPIRES_NEURON_LIF_DISCRETE,
+        .neuron_params = lif_config
+    };
+
+    spires_reservoir *reservoir = NULL;
+    
+    spires_status status = spires_reservoir_create(
+            &config,
+            &reservoir
+    );
+
+    if (status != SPIRES_OK) {
+        fprintf(stderr, "Failed to create reservoir");
+        return -1;
+    }
+
+    //create data set (sin wave time series prediction)
+    double training_inputs[NUM_TRAINING_STEPS * NUM_INPUTS];
+    for (size_t timestep = 0; timestep < NUM_TRAINING_STEPS; timestep++) {
+        for (size_t input = 0; input < NUM_INPUTS; input++) {
+            training_inputs[timestep * NUM_INPUTS + input] = sin(2.0 * PI * (double)timestep / 50.0);
+        }
+    }
+
+    Reservoir_State_Matrix state_matrix = {0};
+    if (collect_reservoir_states(reservoir, training_inputs, NUM_TRAINING_STEPS,
+                &state_matrix) != 0) {
+        fprintf(stderr, "Failed to collect reservoir states");
+        spires_reservoir_destroy(reservoir);
+        return -1;
+    }
+
+    printf("collected state matrix: %zu x %zu\n", state_matrix.num_samples,
+            state_matrix.num_features);
+
+    //generate raster plot for verification
+    if (plot_raster(&state_matrix, NUM_NEURONS, 0.5) != 0) {
+        fprintf(stderr, "Failed to plot raster\n");
+    }
+
+    //now I need to send the outputs to a crossbar
+    double *initial_resistances = malloc(NUM_NEURONS * NUM_OUTPUTS * sizeof(*initial_resistances));
+    if (!initial_resistances) {
+        fprintf(stderr, "Failed to allocate memory for initial resistances");
+        return -1;
+    }
+
+    //all memristors start with same resistance for now
+    for (size_t i = 0; i < NUM_NEURONS * NUM_OUTPUTS; i++) {
+        initial_resistances[i] = 80000;
+    }
+
+    const Crossbar_Config crossbar_config = {
+        .rows = state_matrix.num_features,
+        .columns = NUM_OUTPUTS,
+        .input_series = state_matrix.states,
+        .num_samples = state_matrix.num_samples,
+        .initial_resistance = initial_resistances,
+        .model_path = "hp_memristor.cir",
+        .subcircuit_name = "memristor",
+        .load_resistance = 50.0,
+        .time_step = 1e-6,
+        .stop_time = state_matrix.num_samples * 1e-6,
+        .print_state_nodes = 0
+    };
+
+    if (generate_crossbar("crossbar.cir", &crossbar_config) < 0) {
+        fprintf(stderr, "failed to create crossbar config");
+    }
+
+    //call ngspice for crossbar
+
+    //clean up
+    printf("YAY IT WORKED!!! Cleaning up :)");
+    free(initial_resistances);
+    free_reservoir_state_matrix(&state_matrix);
+    spires_reservoir_destroy(reservoir);
+
+    return 0;
+}
+
+static int plot_raster(
+    const Reservoir_State_Matrix *matrix,
+    size_t neurons_to_plot,
+    double spike_threshold
+) {
+    if (!matrix || !matrix->states || matrix->num_samples == 0) {
+        return -1;
+    }
+
+    if (neurons_to_plot > matrix->num_features) {
+        neurons_to_plot = matrix->num_features;
+    }
+
+    /* first pass: count spikes */
+    size_t spike_count = 0;
+    for (size_t t = 0; t < matrix->num_samples; t++) {
+        for (size_t n = 0; n < neurons_to_plot; n++) {
+            double value = matrix->states[t * matrix->num_features + n];
+            if (value > spike_threshold) {
+                spike_count++;
+            }
+        }
+    }
+
+    if (spike_count == 0) {
+        fprintf(stderr, "No spikes found above threshold %.3f\n", spike_threshold);
+        return -1;
+    }
+
+    PLFLT *x = malloc(spike_count * sizeof(*x));
+    PLFLT *y = malloc(spike_count * sizeof(*y));
+    if (!x || !y) {
+        free(x);
+        free(y);
+        return -1;
+    }
+
+    /* second pass: fill spike coordinates */
+    size_t k = 0;
+    for (size_t t = 0; t < matrix->num_samples; t++) {
+        for (size_t n = 0; n < neurons_to_plot; n++) {
+            double value = matrix->states[t * matrix->num_features + n];
+            if (value > spike_threshold) {
+                x[k] = (PLFLT)t;
+                y[k] = (PLFLT)n;
+                k++;
+            }
+        }
+    }
+
+    /* pick whichever device you have */
+    plsdev("pngcairo");
+    plsfnam("reservoir_raster.png");
+    
+    plsetopt("geometry", "1600x1200");
+    plscolbg(255, 255, 255);
+
+    plinit();
+
+    plscol0(1, 40, 40, 40); //gray axis
+    plscol0(2, 0, 0, 0); //blue points
+
+    plcol0(1);
+    plwidth(1.0);
+
+    plenv(
+        0.0,
+        (PLFLT)(matrix->num_samples - 1),
+        0.0,
+        (PLFLT)(neurons_to_plot - 1),
+        0,
+        0
+    );
+
+    pllab(
+        "Timestep",
+        "Neuron index",
+        "SPIRES Reservoir Raster Plot"
+    );
+
+    plcol0(2);
+    plwidth(1.0);
+
+    for (size_t i = 0; i < spike_count; i++) {
+        PLFLT xline[2] = {x[i], x[i]};
+        PLFLT yline[2] = {y[i] - 0.35, y[i] + 0.35};
+
+        plline(2, xline, yline);
+    }
+    
+    plend();
+
+    free(x);
+    free(y);
+    return 0;
+}