[misc] comment to avoid future confusion about baichuan (#9620)

Signed-off-by: youkaichao <youkaichao@gmail.com>

vllm/model_executor/models/baichuan.py

@@ -432,7 +432,9 @@ class BaiChuanBaseForCausalLM(nn.Module, SupportsLoRA, SupportsPP):
 
 
 class BaichuanForCausalLM(BaiChuanBaseForCausalLM):
-    """Baichuan 13B and Baichuan2 7B/13B."""
+    """Baichuan 13B and Baichuan2 7B/13B.
+    NOTE: the class name has a lower case 'c'.
+    """
 
     def __init__(
         self,
@@ -450,7 +452,9 @@ class BaichuanForCausalLM(BaiChuanBaseForCausalLM):
 
 
 class BaiChuanForCausalLM(BaiChuanBaseForCausalLM):
-    """Baichuan 7B."""
+    """Baichuan 7B.
+    NOTE: the class name has an upper case 'C'.
+    """
 
     def __init__(
         self,

vllm/model_executor/models/registry.py

@@ -26,8 +26,10 @@ _TEXT_GENERATION_MODELS = {
     "AquilaModel": ("llama", "LlamaForCausalLM"),
     "AquilaForCausalLM": ("llama", "LlamaForCausalLM"),  # AquilaChat2
     "ArcticForCausalLM": ("arctic", "ArcticForCausalLM"),
-    "BaiChuanForCausalLM": ("baichuan", "BaiChuanForCausalLM"),  # baichuan-7b
-    "BaichuanForCausalLM": ("baichuan", "BaichuanForCausalLM"),  # baichuan-13b
+    # baichuan-7b, upper case 'C' in the class name
+    "BaiChuanForCausalLM": ("baichuan", "BaiChuanForCausalLM"),
+    # baichuan-13b, lower case 'c' in the class name
+    "BaichuanForCausalLM": ("baichuan", "BaichuanForCausalLM"),
     "BloomForCausalLM": ("bloom", "BloomForCausalLM"),
     # ChatGLMModel supports multimodal
     "CohereForCausalLM": ("commandr", "CohereForCausalLM"),