fix layer norm name in PPO

src/utils/ppo.py

@@ -41,7 +41,7 @@ def replace_model(model: AutoModelForCausalLMWithValueHead, target: Literal["def
 
 def cast_layernorm_dtype(
         model: AutoModelForCausalLMWithValueHead,
-        layer_norm_names: List[str] = ["layernorm"], # for chatglm setting
+        layer_norm_names: List[str] = ["norm", "ln_f"], # for LLaMA and BLOOM setting
         layer_norm_params: Optional[Dict[str, torch.Tensor]] = None
 ) -> Tuple[AutoModelForCausalLMWithValueHead, Dict[str, torch.Tensor]]: