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model : mtmd : make input norm optional in LFM2-VL (#18594) 

Upcoming LFM2-VL releases will have configurable input norm.
See https://github.com/huggingface/transformers/pull/43087 for details.
This commit is contained in:
Tarek Dakhran 2026-01-04 18:50:02 +01:00 committed by GitHub
parent 908a9e5a1e
commit 4974bf53cf
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2 changed files with 17 additions and 4 deletions
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8
tools/mtmd/clip.cpp
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@ -1552,6 +1552,14 @@ struct clip_model_loader {
model.projection = get_tensor(TN_MM_PROJECTOR);
} break;
case PROJECTOR_TYPE_LFM2:
{
model.mm_input_norm_w = get_tensor(TN_MM_INP_NORM, false);
model.mm_input_norm_b = get_tensor(TN_MM_INP_NORM_B, false);
model.mm_1_w = get_tensor(string_format(TN_LLAVA_PROJ, 1, "weight"));
model.mm_1_b = get_tensor(string_format(TN_LLAVA_PROJ, 1, "bias"));
model.mm_2_w = get_tensor(string_format(TN_LLAVA_PROJ, 2, "weight"));
model.mm_2_b = get_tensor(string_format(TN_LLAVA_PROJ, 2, "bias"));
} break;
case PROJECTOR_TYPE_KIMIVL:
{
model.mm_input_norm_w = get_tensor(TN_MM_INP_NORM);

13
tools/mtmd/models/siglip.cpp
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@ -50,10 +50,15 @@ ggml_cgraph * clip_graph_siglip::build() {
const int scale_factor = model.hparams.n_merge;
cur = build_patch_merge_permute(cur, scale_factor);
// projection
cur = ggml_norm(ctx0, cur, 1e-5); // default nn.LayerNorm
cur = ggml_mul(ctx0, cur, model.mm_input_norm_w);
cur = ggml_add(ctx0, cur, model.mm_input_norm_b);
// projection, in LFM2-VL input norm is optional
if (model.mm_input_norm_w) {
cur = ggml_norm(ctx0, cur, 1e-5); // default nn.LayerNorm
cur = ggml_mul(ctx0, cur, model.mm_input_norm_w);
}
if (model.mm_input_norm_b) {
cur = ggml_add(ctx0, cur, model.mm_input_norm_b);
}
cur = build_ffn(cur,
model.mm_1_w, model.mm_1_b,