[bug fix][pp] fix weight load for qwen2.5-vl (#15138)

Signed-off-by: Xuchun Shang <xuchun.shang@gmail.com>

python/sglang/srt/models/qwen2_5_vl.py

@@ -761,6 +761,14 @@ class Qwen2_5_VLForConditionalGeneration(nn.Module):
             if "rotary_emb.inv_freq" in name:
                 continue
 
+            if self.pp_group.is_last_rank and "model.embed_tokens.weight" in name:
+                if "lm_head.weight" in params_dict:
+                    lm_head_param = params_dict["lm_head.weight"]
+                    weight_loader = getattr(
+                        lm_head_param, "weight_loader", default_weight_loader
+                    )
+                    weight_loader(lm_head_param, loaded_weight)
+
             for param_name, weight_name, shard_id in stacked_params_mapping:
                 if weight_name not in name:
                     continue
@@ -807,10 +815,8 @@ class Qwen2_5_VLForConditionalGeneration(nn.Module):
                     if name in params_dict.keys():
                         param = params_dict[name]
                     else:
-                        if get_global_server_args().encoder_only:
-                            continue
-                        else:
-                            raise ValueError(f"Weight {name} not found in params_dict")
+                        continue
+
                 except KeyError:
                     print(params_dict.keys())
                     raise