fixed by comments

Author: mingkang111

ads/llm/langchain/plugins/base.py

@@ -16,7 +16,7 @@
 class BaseLLM(LLM, Serializable):
     """Base OCI LLM class. Contains common attributes."""
 
-    auth: dict = Field(default_factory=default_signer)
+    auth: dict = Field(default_factory=default_signer, exclude=True)
     """ADS auth dictionary for OCI authentication.
     This can be generated by calling `ads.common.auth.api_keys()` or `ads.common.auth.resource_principal()`.
     If this is not provided then the `ads.common.default_signer()` will be used."""