Function cbm_sem_diffuse

src/semantic/semantic.c:1664–1683

/* ── Graph diffusion ─────────────────────────────────────────────── */

void cbm_sem_diffuse(cbm_sem_vec_t *combined, const cbm_sem_vec_t *neighbors, int neighbor_count,
                     float alpha) {
    if (!combined || !neighbors || neighbor_count <= 0) {
        return;
    }
    /* Blend: combined = (1-α) × combined + α × mean(neighbors) */
    cbm_sem_vec_t mean;
    memset(&mean, 0, sizeof(mean));
    for (int n = 0; n < neighbor_count; n++) {
        for (int i = 0; i < CBM_SEM_DIM; i++) {
            mean.v[i] += neighbors[n].v[i];
        }
    }
    float inv_n = CBM_SEM_UNIT_POS / (float)neighbor_count;
    float one_minus_alpha = CBM_SEM_UNIT_POS - alpha;
    for (int i = 0; i < CBM_SEM_DIM; i++) {
        combined->v[i] = (one_minus_alpha * combined->v[i]) + (alpha * mean.v[i] * inv_n);
    }
    cbm_sem_normalize(combined);
}