Support load fine-tuned LLaVA model (sgl-project#80)

Author: isaac-vidas

python/sglang/srt/models/llama2.py

@@ -303,6 +303,8 @@ def load_weights(
                 # Skip loading extra bias for GPTQ models.
                 if name.endswith(".bias") and name not in params_dict:
                     continue
+                if name.startswith("model.vision_tower") and name not in params_dict:
+                    continue
                 param = params_dict[name]
                 weight_loader = param.weight_loader
                 weight_loader(param, loaded_weight, shard_id)
@@ -311,6 +313,8 @@ def load_weights(
                 # Skip loading extra bias for GPTQ models.
                 if name.endswith(".bias") and name not in params_dict:
                     continue
+                if name.startswith("model.vision_tower") and name not in params_dict:
+                    continue
                 param = params_dict[name]
                 weight_loader = getattr(param, "weight_loader", default_weight_loader)
                 weight_loader(param, loaded_weight)