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fix(mtmd): guard clip d_head/kq_scale against n_head==0 (Gemma 4 12B SIGFPE) #166

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fix(mtmd): guard clip d_head/kq_scale against n_head==0 (Gemma 4 12B SIGFPE) #166

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4 changes: 2 additions & 2 deletions tools/mtmd/clip.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -240,11 +240,11 @@ clip_graph::clip_graph(clip_ctx * ctx, const clip_image_f32 & img) :
n_patches(n_patches_x * n_patches_y),
n_embd(hparams.n_embd),
n_head(hparams.n_head),
d_head(n_embd / n_head),
d_head(n_head > 0 ? n_embd / n_head : 0),
n_layer(hparams.n_layer),
n_mmproj_embd(clip_n_mmproj_embd(ctx)),
eps(hparams.eps),
kq_scale(1.0f / sqrtf((float)d_head)),
kq_scale(d_head > 0 ? 1.0f / sqrtf((float)d_head) : 0.0f),
flash_attn_type(ctx->flash_attn_type) {
struct ggml_init_params params = {
/*.mem_size =*/ ctx->buf_compute_meta.size(),
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