whisper : fix extra memory usage after recent processor changes

Had increased the memory buffer to the size of the model and forgot to
bring it down.

whisper.cpp

@@ -133,11 +133,19 @@ static const std::map<std::string, std::pair<int, std::string>> g_lang = {
 static const size_t MB = 1024*1024;
 
 static const std::map<e_model, size_t> MEM_REQ_MODEL = {
-    { MODEL_TINY,     86ull*MB },
+    { MODEL_TINY,     74ull*MB },
-    { MODEL_BASE,    165ull*MB },
+    { MODEL_BASE,    142ull*MB },
-    { MODEL_SMALL,   540ull*MB },
+    { MODEL_SMALL,   466ull*MB },
-    { MODEL_MEDIUM, 1650ull*MB },
+    { MODEL_MEDIUM, 1464ull*MB },
-    { MODEL_LARGE,  3260ull*MB },
+    { MODEL_LARGE,  2952ull*MB },
+};
+
+static const std::map<e_model, size_t> MEM_REQ_MEMORY = {
+    { MODEL_TINY,     12ull*MB },
+    { MODEL_BASE,     24ull*MB },
+    { MODEL_SMALL,    70ull*MB },
+    { MODEL_MEDIUM,  184ull*MB },
+    { MODEL_LARGE,   306ull*MB },
 };
 
 static const std::map<e_model, size_t> MEM_REQ_ENCODE = {
@@ -498,7 +506,7 @@ bool whisper_model_load(const std::string & fname, whisper_context & wctx) {
 
         wctx.buf_model = new std::vector<uint8_t>();
         wctx.buf_model->resize(MEM_REQ_MODEL.at(model.type));
-        wctx.buf_memory.resize(std::max(MEM_REQ_MODEL.at(model.type), MEM_REQ_MODEL.at(model.type))); // TODO: TMP !!!
+        wctx.buf_memory.resize(MEM_REQ_MEMORY.at(model.type));
         wctx.buf_compute.resize(std::max(MEM_REQ_ENCODE.at(model.type), MEM_REQ_DECODE.at(model.type)));
         wctx.buf_compute_layer.resize(std::max(MEM_REQ_ENCODE_LAYER.at(model.type), MEM_REQ_DECODE_LAYER.at(model.type)));
 
@@ -722,20 +730,6 @@ bool whisper_model_load(const std::string & fname, whisper_context & wctx) {
         }
     }
 
-    // create the ggml memory context
-    {
-        struct ggml_init_params params = {
-            .mem_size   = wctx.buf_memory.size(),
-            .mem_buffer = wctx.buf_memory.data(),
-        };
-
-        model.ctx_mem = ggml_init(params);
-        if (!model.ctx_mem) {
-            fprintf(stderr, "%s: ggml_init() failed\n", __func__);
-            return false;
-        }
-    }
-
     // prepare memory for the weights
     {
         auto & ctx = model.ctx;
@@ -932,6 +926,20 @@ bool whisper_model_load(const std::string & fname, whisper_context & wctx) {
         }
     }
 
+    // create the ggml memory context
+    {
+        struct ggml_init_params params = {
+            .mem_size   = wctx.buf_memory.size(),
+            .mem_buffer = wctx.buf_memory.data(),
+        };
+
+        model.ctx_mem = ggml_init(params);
+        if (!model.ctx_mem) {
+            fprintf(stderr, "%s: ggml_init() failed\n", __func__);
+            return false;
+        }
+    }
+
     // key + value memory
     {
         auto & ctx = model.ctx_mem;