llama : add model types for mixtral (ggml-org#6589)

Author: slaren

llama.cpp

@@ -1705,6 +1705,8 @@ enum e_model {
     MODEL_MEDIUM,
     MODEL_LARGE,
     MODEL_XL,
+    MODEL_8x7B,
+    MODEL_8x22B,
 };
 
 static const size_t kiB = 1024;
@@ -3558,6 +3560,8 @@ static const char * llama_model_type_name(e_model type) {
         case MODEL_MEDIUM: return "0.4B";
         case MODEL_LARGE:  return "0.8B";
         case MODEL_XL:     return "1.5B";
+        case MODEL_8x7B:   return "8x7B";
+        case MODEL_8x22B:  return "8x22B";
         default:           return "?B";
     }
 }
@@ -3672,15 +3676,23 @@ static void llm_load_hparams(
             {
                 ml.get_key(LLM_KV_ATTENTION_LAYERNORM_RMS_EPS, hparams.f_norm_rms_eps);
 
-                switch (hparams.n_layer) {
-                    case 22: model.type = e_model::MODEL_1B; break;
-                    case 26: model.type = e_model::MODEL_3B; break;
-                    case 32: model.type = e_model::MODEL_7B; break;
-                    case 40: model.type = e_model::MODEL_13B; break;
-                    case 48: model.type = e_model::MODEL_34B; break;
-                    case 60: model.type = e_model::MODEL_30B; break;
-                    case 80: model.type = hparams.n_head == hparams.n_head_kv ? e_model::MODEL_65B : e_model::MODEL_70B; break;
-                    default: model.type = e_model::MODEL_UNKNOWN;
+                if (hparams.n_expert == 8) {
+                    switch (hparams.n_layer) {
+                        case 32: model.type = e_model::MODEL_8x7B; break;
+                        case 56: model.type = e_model::MODEL_8x22B; break;
+                        default: model.type = e_model::MODEL_UNKNOWN;
+                    }
+                } else {
+                    switch (hparams.n_layer) {
+                        case 22: model.type = e_model::MODEL_1B; break;
+                        case 26: model.type = e_model::MODEL_3B; break;
+                        case 32: model.type = e_model::MODEL_7B; break;
+                        case 40: model.type = e_model::MODEL_13B; break;
+                        case 48: model.type = e_model::MODEL_34B; break;
+                        case 60: model.type = e_model::MODEL_30B; break;
+                        case 80: model.type = hparams.n_head == hparams.n_head_kv ? e_model::MODEL_65B : e_model::MODEL_70B; break;
+                        default: model.type = e_model::MODEL_UNKNOWN;
+                    }
                 }
             } break;
         case LLM_ARCH_MINICPM: