diff --git a/vllm-v0.6.2/vllm/model_executor/models/transformers/base.py b/vllm-v0.6.2/vllm/model_executor/models/transformers/base.py
index 64de039..5007e1f 100644
--- a/vllm-v0.6.2/vllm/model_executor/models/transformers/base.py
+++ b/vllm-v0.6.2/vllm/model_executor/models/transformers/base.py
@@ -176,14 +176,9 @@ class Base(nn.Module):
         }
     )
     
-    def __init_subclass__(cls, *args, **kwargs):
-        """Merge hf_to_vllm_mapper in MRO from most specific to least specific."""
-        super().__init_subclass__(*args, **kwargs)
-        hf_to_vllm_mapper = WeightsMapper()
-        for base in cls.__mro__:
-            if base_hf_to_vllm_mapper := getattr(base, "hf_to_vllm_mapper", None):
-                hf_to_vllm_mapper |= base_hf_to_vllm_mapper
-        cls.hf_to_vllm_mapper = hf_to_vllm_mapper
+    # Note: __init_subclass__ with WeightsMapper merging is not supported in v0.6.2
+    # because WeightsMapper doesn't implement __or__/__ior__ operators.
+    # Each Mixin should define its own hf_to_vllm_mapper if needed.
     
     def __init__(self, *, vllm_config: VllmConfig, prefix: str = "") -> None:
         super().__init__()