llama : allow gguf rope keys to be overridden with defaults

Author: cebtenzzre

Diff for: llama.cpp

@@ -1617,28 +1617,19 @@ static void llm_load_hparams(
     hparams.n_head_kv = hparams.n_head;
     GGUF_GET_KEY(ctx, hparams.n_head_kv, gguf_get_val_u32, GGUF_TYPE_UINT32, false, kv(LLM_KV_ATTENTION_HEAD_COUNT_KV));
 
-    // TODO: manually setting rope freq base and scale should override this
-    // FIXME: partial fix when the param specified is not the default value, but
-    //        will not work for overriding the model value to the params default
-
     llama_context_params defaults = llama_context_default_params();
 
-    // rope_freq_base
-    {
-        float ropebase = 10000.0f;
-        GGUF_GET_KEY(ctx, ropebase, gguf_get_val_f32, GGUF_TYPE_FLOAT32, false, kv(LLM_KV_ROPE_FREQ_BASE));
-        if (ropebase != 10000.0f && rope_freq_base == defaults.rope_freq_base) {
-            rope_freq_base = ropebase;
-        }
+    // rope_freq_base (optional)
+    if (rope_freq_base == 0.0f) {
+        rope_freq_base = 10000.0f;
+        GGUF_GET_KEY(ctx, rope_freq_base, gguf_get_val_f32, GGUF_TYPE_FLOAT32, false, kv(LLM_KV_ROPE_FREQ_BASE));
     }
 
     // rope_freq_scale (inverse of the kv) is optional
-    {
+    if (rope_freq_scale == 0.0f) {
         float ropescale = 1.0f;
         GGUF_GET_KEY(ctx, ropescale, gguf_get_val_f32, GGUF_TYPE_FLOAT32, false, kv(LLM_KV_ROPE_SCALE_LINEAR));
-        if (ropescale != 1.0f && rope_freq_scale == defaults.rope_freq_scale) {
-            rope_freq_scale = 1.0f/ropescale;
-        }
+        rope_freq_scale = 1.0f/ropescale;
     }
 
     // sanity check for n_rot (optional)
@@ -5349,8 +5340,8 @@ struct llama_context_params llama_context_default_params() {
         /*.n_gpu_layers                =*/ 0,
         /*.main_gpu                    =*/ 0,
         /*.tensor_split                =*/ nullptr,
-        /*.rope_freq_base              =*/ 10000.0f,
-        /*.rope_freq_scale             =*/ 1.0f,
+        /*.rope_freq_base              =*/ 0.0f,
+        /*.rope_freq_scale             =*/ 0.0f,
         /*.progress_callback           =*/ nullptr,
         /*.progress_callback_user_data =*/ nullptr,
         /*.low_vram                    =*/ false,