Refactored error handling for hyperparameter validation in clip.cpp

Removed the try-catch block and throw statements
Added validation checks for all hyperparameters, ensuring they are not set to invalid or zero values.
Used fprintf to log error messages when invalid hyperparameters are encountered.

Author: Tejaakshaykumar

examples/llava/clip.cpp

@@ -1270,7 +1270,6 @@ struct clip_ctx * clip_model_load(const char * fname, const int verbosity = 1) {
         // load vision model
         auto & vision_model = new_clip->vision_model;
         auto & hparams = vision_model.hparams;
-        try{
             hparams.hidden_size    = get_u32(ctx, format(KEY_N_EMBD, "vision"));
             hparams.n_head         = get_u32(ctx, format(KEY_N_HEAD, "vision"));
             hparams.n_intermediate = get_u32(ctx, format(KEY_N_FF, "vision"));
@@ -1279,12 +1278,10 @@ struct clip_ctx * clip_model_load(const char * fname, const int verbosity = 1) {
             hparams.patch_size     = get_u32(ctx, KEY_PATCH_SIZE);
             hparams.projection_dim = get_u32(ctx, format(KEY_PROJ_DIM, "vision"));
             hparams.eps            = get_f32(ctx, format(KEY_LAYER_NORM_EPS, "vision"));
-            if (hparams.hidden_size == 0 || hparams.n_head == 0 || hparams.n_layer == 0 || hparams.n_intermediate || hparams.image_size == 0 || hparams.patch_size || hparams.projection_dim || hparams.eps) {
-                throw std::invalid_argument("Invalid hyperparameter values");
+            if (hparams.hidden_size == 0 || hparams.n_head == 0 || hparams.n_layer == 0 || hparams.n_intermediate == 0 || hparams.image_size == 0 || hparams.patch_size == 0 || hparams.projection_dim == 0 || hparams.eps == 0) {
+                fprintf(stderr, "Error: Invalid hyperparameter values\n");
+                return false;
             }
-        } catch (const std::exception& e) {
-            fprintf(stderr, "Error while loading hyperparameters: %s\n", e.what());
-            return false;
         }
         try {
             int idx = get_key_idx(ctx, KEY_IMAGE_GRID_PINPOINTS);