#include "models.h" ggml_cgraph * clip_graph_youtuvl::build() { GGML_ASSERT(model.class_embedding == nullptr); const int batch_size = 1; const bool use_window_attn = !hparams.wa_layer_indexes.empty(); const int n_pos = n_patches; const int num_position_ids = n_pos * 4; const int m = 2; const int Wp = n_patches_x; const int Hp = n_patches_y; const int Hm = Hp / m; const int Wm = Wp / m; norm_type norm_t = NORM_TYPE_NORMAL; int mrope_sections[4] = {d_head/4, d_head/4, d_head/4, d_head/4}; ggml_tensor * inp = build_inp_raw(); // change conv3d to linear // reshape and permute to get patches, permute from (patch_size, m, Wm, patch_size, m, Hm, C) to (C, patch_size, patch_size, m, m, Wm, Hm) { inp = ggml_reshape_4d( ctx0, inp, Wm * m * patch_size, m * patch_size, Hm, 3); inp = ggml_permute(ctx0, inp, 1, 2, 3, 0); inp = ggml_cont_4d( ctx0, inp, m * patch_size * 3, Wm, m * patch_size, Hm); inp = ggml_permute(ctx0, inp, 0, 2, 1, 3); inp = ggml_cont_4d( ctx0, inp, m * patch_size * 3, patch_size, m, Hm * Wm); inp = ggml_permute(ctx0, inp, 1, 0, 2, 3); inp = ggml_cont_4d( ctx0, inp, patch_size, 3, patch_size, Hm * Wm * m * m); inp = ggml_permute(ctx0, inp, 2, 0, 1, 3); inp = ggml_cont_3d( ctx0, inp, 3*patch_size* patch_size, Hm * Wm * m * m, 1); } inp = ggml_mul_mat(ctx0, model.patch_embeddings_0, inp); if (model.patch_bias) { inp = ggml_add(ctx0, inp, model.patch_bias); } inp = ggml_reshape_2d(ctx0, inp, n_embd, n_patches); ggml_tensor * inpL = inp; ggml_tensor * window_mask = nullptr; ggml_tensor * window_idx = nullptr; ggml_tensor * inv_window_idx = nullptr; ggml_tensor * positions = ggml_new_tensor_1d(ctx0, GGML_TYPE_I32, num_position_ids); ggml_set_name(positions, "positions"); ggml_set_input(positions); // pre-layernorm if (model.pre_ln_w) { inpL = build_norm(inpL, model.pre_ln_w, model.pre_ln_b, norm_t, eps, -1); } if (use_window_attn) { inv_window_idx = ggml_new_tensor_1d(ctx0, GGML_TYPE_I32, n_pos / 4); ggml_set_name(inv_window_idx, "inv_window_idx"); ggml_set_input(inv_window_idx); // mask for window attention window_mask = ggml_new_tensor_2d(ctx0, GGML_TYPE_F32, n_pos, n_pos); ggml_set_name(window_mask, "window_mask"); ggml_set_input(window_mask); // if flash attn is used, we need to pad the mask and cast to f16 if (flash_attn_type == CLIP_FLASH_ATTN_TYPE_ENABLED) { window_mask = ggml_cast(ctx0, window_mask, GGML_TYPE_F16); } // inpL shape: [n_embd, n_patches_x * n_patches_y, batch_size] GGML_ASSERT(batch_size == 1); inpL = ggml_reshape_2d(ctx0, inpL, n_embd * 4, n_patches_x * n_patches_y * batch_size / 4); inpL = ggml_get_rows(ctx0, inpL, inv_window_idx); inpL = ggml_reshape_3d(ctx0, inpL, n_embd, n_patches_x * n_patches_y, batch_size); } // loop over layers for (int il = 0; il < n_layer; il++) { const auto & layer = model.layers[il]; const bool full_attn = use_window_attn ? hparams.wa_layer_indexes.count(il) > 0 : true; ggml_tensor * cur = inpL; // inpL = residual, cur = hidden_states // layernorm1 cur = build_norm(cur, layer.ln_1_w, layer.ln_1_b, norm_t, eps, il); // self-attention { ggml_tensor * Qcur = ggml_add(ctx0, ggml_mul_mat(ctx0, layer.q_w, cur), layer.q_b); ggml_tensor * Kcur = ggml_add(ctx0, ggml_mul_mat(ctx0, layer.k_w, cur), layer.k_b); ggml_tensor * Vcur = ggml_add(ctx0, ggml_mul_mat(ctx0, layer.v_w, cur), layer.v_b); Qcur = ggml_reshape_3d(ctx0, Qcur, d_head, n_head, n_patches); Kcur = ggml_reshape_3d(ctx0, Kcur, d_head, n_head, n_patches); Vcur = ggml_reshape_3d(ctx0, Vcur, d_head, n_head, n_patches); Qcur = ggml_rope_multi( ctx0, Qcur, positions, nullptr, d_head/2, mrope_sections, GGML_ROPE_TYPE_VISION, 32768, 10000, 1, 0, 1, 32, 1); Kcur = ggml_rope_multi( ctx0, Kcur, positions, nullptr, d_head/2, mrope_sections, GGML_ROPE_TYPE_VISION, 32768, 10000, 1, 0, 1, 32, 1); ggml_tensor * attn_mask = full_attn ? nullptr : window_mask; cur = build_attn(layer.o_w, layer.o_b, Qcur, Kcur, Vcur, attn_mask, kq_scale, il); } // re-add the layer input, e.g., residual cur = ggml_add(ctx0, cur, inpL); inpL = cur; // inpL = residual, cur = hidden_states // layernorm2 cur = build_norm(cur, layer.ln_2_w, layer.ln_2_b, norm_t, eps, il); // ffn cur = build_ffn(cur, layer.ff_up_w, layer.ff_up_b, nullptr, nullptr, layer.ff_down_w, layer.ff_down_b, hparams.ffn_op, il); // residual 2 cur = ggml_add(ctx0, inpL, cur); inpL = cur; } ggml_tensor * embeddings = inpL; if (use_window_attn) { const int spatial_merge_unit = 4; window_idx = ggml_new_tensor_1d(ctx0, GGML_TYPE_I32, n_pos / spatial_merge_unit); ggml_set_name(window_idx, "window_idx"); ggml_set_input(window_idx); GGML_ASSERT(batch_size == 1); embeddings = ggml_reshape_2d(ctx0, embeddings, n_embd * spatial_merge_unit, n_patches / spatial_merge_unit); embeddings = ggml_get_rows(ctx0, embeddings, window_idx); embeddings = ggml_reshape_3d(ctx0, embeddings, n_embd, n_patches, batch_size); cb(embeddings, "window_order_restored", -1); } // post-layernorm (part of Siglip2VisionTransformer, applied after encoder) if (model.post_ln_w) { embeddings = build_norm(embeddings, model.post_ln_w, model.post_ln_b, norm_t, eps, n_layer); } // Now apply merger (VLPatchMerger): // 1. Apply RMS norm (ln_q in VLPatchMerger) embeddings = build_norm(embeddings, model.mm_input_norm_w, nullptr, NORM_TYPE_RMS, 1e-6, -1); cb(embeddings, "merger_normed", -1); // 2. First reshape for spatial merge (merge 2x2 patches) embeddings = ggml_reshape_3d(ctx0, embeddings, n_embd * 4, n_pos / 4, batch_size); cb(embeddings, "merger_reshaped", -1); embeddings = build_ffn(embeddings, model.mm_0_w, model.mm_0_b, nullptr, nullptr, model.mm_1_w, model.mm_1_b, FFN_GELU, -1); ggml_build_forward_expand(gf, embeddings); return gf; }