Add compute graph handling for MOE based nomic embed v2.

Signed-off-by: Adam Treat <[email protected]>

Author: manyoso

src/llama-graph.cpp

@@ -901,31 +901,38 @@ ggml_tensor * llm_graph_context::build_moe_ffn(
     }
 
     cur = ggml_reshape_3d(ctx0, cur, n_embd, 1, n_tokens);
-    ggml_tensor * up = build_lora_mm_id(up_exps, cur, selected_experts); // [n_ff, n_expert_used, n_tokens]
-    cb(up, "ffn_moe_up", il);
+    ggml_tensor * tmp = build_lora_mm_id(up_exps, cur, selected_experts); // [n_ff, n_expert_used, n_tokens]
+    cb(tmp, "ffn_moe_up", il);
 
-    ggml_tensor * gate = build_lora_mm_id(gate_exps, cur, selected_experts); // [n_ff, n_expert_used, n_tokens]
-    cb(gate, "ffn_moe_gate", il);
+    ggml_tensor * experts = nullptr;
+    if (gate_exps) {
+        cur = build_lora_mm_id(gate_exps, cur, selected_experts); // [n_ff, n_expert_used, n_tokens]
+        cb(cur, "ffn_moe_gate", il);
+    } else {
+        cur = tmp;
+    }
 
     switch (type_op) {
         case LLM_FFN_SILU:
             {
-                gate = ggml_silu(ctx0, gate);
-                cb(gate, "ffn_moe_silu", il);
+                cur = ggml_silu(ctx0, cur);
+                cb(cur, "ffn_moe_silu", il);
             } break;
         case LLM_FFN_GELU:
             {
-                gate = ggml_gelu(ctx0, gate);
-                cb(gate, "ffn_moe_gelu", il);
+                cur = ggml_gelu(ctx0, cur);
+                cb(cur, "ffn_moe_gelu", il);
             } break;
         default:
             GGML_ABORT("fatal error");
     }
 
-    ggml_tensor * par = ggml_mul(ctx0, up, gate); // [n_ff, n_expert_used, n_tokens]
-    cb(par, "ffn_moe_gate_par", il);
+    if (gate_exps) {
+        cur = ggml_mul(ctx0, cur, tmp); // [n_ff, n_expert_used, n_tokens]
+        cb(cur, "ffn_moe_gate_par", il);
+    }
 
-    ggml_tensor * experts = build_lora_mm_id(down_exps, par, selected_experts); // [n_embd, n_expert_used, n_tokens]
+    experts = build_lora_mm_id(down_exps, cur, selected_experts); // [n_embd, n_expert_used, n_tokens]
     cb(experts, "ffn_moe_down", il);
 
     experts = ggml_mul(ctx0, experts, weights);

src/llama-model.cpp

@@ -5312,6 +5312,11 @@ struct llm_build_bert : public llm_graph_context {
                 cur = build_lora_mm(model.layers[il].wqkv, cur);
                 cb(cur, "wqkv", il);
 
+                if (model.arch == LLM_ARCH_NOMIC_BERT_MOE) {
+                    cur = ggml_add(ctx0, cur, model.layers[il].bqkv);
+                    cb(cur, "bqkv", il);
+                }
+
                 Qcur = ggml_cont(ctx0, ggml_view_2d(ctx0, cur, n_embd,     n_tokens, cur->nb[1], 0*sizeof(float)*(n_embd)));
                 Kcur = ggml_cont(ctx0, ggml_view_2d(ctx0, cur, n_embd_gqa, n_tokens, cur->nb[1], 1*sizeof(float)*(n_embd)));
                 Vcur = ggml_cont(ctx0, ggml_view_2d(ctx0, cur, n_embd_gqa, n_tokens, cur->nb[1], 1*sizeof(float)*(n_embd + n_embd_gqa)));
@@ -5364,29 +5369,46 @@ struct llm_build_bert : public llm_graph_context {
             cb(ffn_inp, "ffn_inp", il);
 
             // feed-forward network
-            if (model.arch == LLM_ARCH_BERT) {
+            if (hparams.moe_every_n_layers > 0 && il % hparams.moe_every_n_layers == 1) {
+                // MoE branch
+                cur = build_moe_ffn(cur,
+                        model.layers[il].ffn_gate_inp,
+                        model.layers[il].ffn_up_exps,
+                        nullptr,
+                        model.layers[il].ffn_down_exps,
+                        nullptr,
+                        hparams.n_expert,
+                        hparams.n_expert_used,
+                        LLM_FFN_GELU,
+                        true, false,
+                        0.0f,
+                        LLAMA_EXPERT_GATING_FUNC_TYPE_SOFTMAX, il);
+                cb(cur, "ffn_moe_out", il);
+            } else if (model.arch == LLM_ARCH_BERT || model.arch == LLM_ARCH_NOMIC_BERT_MOE) {
                 cur = build_ffn(cur,
                         model.layers[il].ffn_up,   model.layers[il].ffn_up_b,   NULL,
                         NULL,                      NULL,                        NULL,
                         model.layers[il].ffn_down, model.layers[il].ffn_down_b, NULL,
                         NULL,
                         LLM_FFN_GELU, LLM_FFN_SEQ, il);
+                cb(cur, "ffn_out", il);
             } else if (model.arch == LLM_ARCH_JINA_BERT_V2) {
                 cur = build_ffn(cur,
                         model.layers[il].ffn_up,   NULL,                        NULL,
                         model.layers[il].ffn_gate, NULL,                        NULL,
                         model.layers[il].ffn_down, model.layers[il].ffn_down_b, NULL,
                         NULL,
                         LLM_FFN_GELU, LLM_FFN_PAR, il);
+                cb(cur, "ffn_out", il);
             } else {
                 cur = build_ffn(cur,
                         model.layers[il].ffn_up,   NULL, NULL,
                         model.layers[il].ffn_gate, NULL, NULL,
                         model.layers[il].ffn_down, NULL, NULL,
                         NULL,
                         LLM_FFN_SILU, LLM_FFN_PAR, il);
+                cb(cur, "ffn_out", il);
             }
-            cb(cur, "ffn_out", il);
 
             // attentions bypass the intermediate layer
             cur = ggml_add(ctx0, cur, ffn_inp);