From cda68d717c14215fdacfee9394dccd5dc43e8fbd Mon Sep 17 00:00:00 2001
From: Li-Lun Lin <70696274+alan910127@users.noreply.github.com>
Date: Wed, 3 Jan 2024 10:49:01 +0800
Subject: [PATCH] core[patch]: update LanguageModelInput from List to Sequence
 (#14405)

Co-authored-by: Erick Friis <erick@langchain.dev>
---
 libs/core/langchain_core/language_models/base.py        | 2 +-
 libs/core/langchain_core/language_models/chat_models.py | 2 +-
 libs/core/langchain_core/language_models/llms.py        | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/libs/core/langchain_core/language_models/base.py b/libs/core/langchain_core/language_models/base.py
index b590e0df84..ef9d129967 100644
--- a/libs/core/langchain_core/language_models/base.py
+++ b/libs/core/langchain_core/language_models/base.py
@@ -48,7 +48,7 @@ def _get_token_ids_default_method(text: str) -> List[int]:
     return tokenizer.encode(text)
 
 
-LanguageModelInput = Union[PromptValue, str, List[BaseMessage]]
+LanguageModelInput = Union[PromptValue, str, Sequence[BaseMessage]]
 LanguageModelOutput = Union[BaseMessage, str]
 LanguageModelLike = Runnable[LanguageModelInput, LanguageModelOutput]
 LanguageModelOutputVar = TypeVar("LanguageModelOutputVar", BaseMessage, str)
diff --git a/libs/core/langchain_core/language_models/chat_models.py b/libs/core/langchain_core/language_models/chat_models.py
index 047908f06e..c833ebede8 100644
--- a/libs/core/langchain_core/language_models/chat_models.py
+++ b/libs/core/langchain_core/language_models/chat_models.py
@@ -142,7 +142,7 @@ class BaseChatModel(BaseLanguageModel[BaseMessage], ABC):
             return input
         elif isinstance(input, str):
             return StringPromptValue(text=input)
-        elif isinstance(input, list):
+        elif isinstance(input, Sequence):
             return ChatPromptValue(messages=input)
         else:
             raise ValueError(
diff --git a/libs/core/langchain_core/language_models/llms.py b/libs/core/langchain_core/language_models/llms.py
index 4ecfc93521..228a3814f1 100644
--- a/libs/core/langchain_core/language_models/llms.py
+++ b/libs/core/langchain_core/language_models/llms.py
@@ -205,7 +205,7 @@ class BaseLLM(BaseLanguageModel[str], ABC):
             return input
         elif isinstance(input, str):
             return StringPromptValue(text=input)
-        elif isinstance(input, list):
+        elif isinstance(input, Sequence):
             return ChatPromptValue(messages=input)
         else:
             raise ValueError(