core,groq,openai,mistralai,robocorp,fireworks,anthropic[patch]: Update BaseModel subclass and instance checks to handle both v1 and proper namespaces (#24417)

After this PR chat models will correctly handle pydantic 2 with
bind_tools and with_structured_output.


```python
import pydantic
print(pydantic.__version__)
```
2.8.2

```python
from langchain_openai import ChatOpenAI
from pydantic import BaseModel, Field

class Add(BaseModel):
    x: int
    y: int

model = ChatOpenAI().bind_tools([Add])
print(model.invoke('2 + 5').tool_calls)

model = ChatOpenAI().with_structured_output(Add)
print(type(model.invoke('2 + 5')))
```

```
[{'name': 'Add', 'args': {'x': 2, 'y': 5}, 'id': 'call_PNUFa4pdfNOYXxIMHc6ps2Do', 'type': 'tool_call'}]
<class '__main__.Add'>
```


```python
from langchain_openai import ChatOpenAI
from pydantic.v1 import BaseModel, Field

class Add(BaseModel):
    x: int
    y: int

model = ChatOpenAI().bind_tools([Add])
print(model.invoke('2 + 5').tool_calls)

model = ChatOpenAI().with_structured_output(Add)
print(type(model.invoke('2 + 5')))
```

```python
[{'name': 'Add', 'args': {'x': 2, 'y': 5}, 'id': 'call_hhiHYP441cp14TtrHKx3Upg0', 'type': 'tool_call'}]
<class '__main__.Add'>
```

Addresses issues: https://github.com/langchain-ai/langchain/issues/22782

---------

Co-authored-by: Eugene Yurtsev <eyurtsev@gmail.com>

libs/community/langchain_community/chains/ernie_functions/base.py

@@ -24,6 +24,7 @@ from langchain_core.output_parsers import (
 from langchain_core.prompts import BasePromptTemplate
 from langchain_core.pydantic_v1 import BaseModel
 from langchain_core.runnables import Runnable
+from langchain_core.utils.pydantic import is_basemodel_subclass
 
 from langchain_community.output_parsers.ernie_functions import (
     JsonOutputFunctionsParser,
@@ -94,7 +95,7 @@ def _get_python_function_arguments(function: Callable, arg_descriptions: dict) -
     for arg, arg_type in annotations.items():
         if arg == "return":
             continue
-        if isinstance(arg_type, type) and issubclass(arg_type, BaseModel):
+        if isinstance(arg_type, type) and is_basemodel_subclass(arg_type):
             # Mypy error:
             # "type" has no attribute "schema"
             properties[arg] = arg_type.schema()  # type: ignore[attr-defined]
@@ -156,7 +157,7 @@ def convert_to_ernie_function(
     """
     if isinstance(function, dict):
         return function
-    elif isinstance(function, type) and issubclass(function, BaseModel):
+    elif isinstance(function, type) and is_basemodel_subclass(function):
         return cast(Dict, convert_pydantic_to_ernie_function(function))
     elif callable(function):
         return convert_python_function_to_ernie_function(function)
@@ -185,7 +186,7 @@ def get_ernie_output_parser(
             only the function arguments and not the function name.
     """
     function_names = [convert_to_ernie_function(f)["name"] for f in functions]
-    if isinstance(functions[0], type) and issubclass(functions[0], BaseModel):
+    if isinstance(functions[0], type) and is_basemodel_subclass(functions[0]):
         if len(functions) > 1:
             pydantic_schema: Union[Dict, Type[BaseModel]] = {
                 name: fn for name, fn in zip(function_names, functions)

libs/community/langchain_community/chat_models/baidu_qianfan_endpoint.py

@@ -40,11 +40,17 @@ from langchain_core.output_parsers.openai_tools import (
     PydanticToolsParser,
 )
 from langchain_core.outputs import ChatGeneration, ChatGenerationChunk, ChatResult
-from langchain_core.pydantic_v1 import BaseModel, Field, SecretStr, root_validator
+from langchain_core.pydantic_v1 import (
+    BaseModel,
+    Field,
+    SecretStr,
+    root_validator,
+)
 from langchain_core.runnables import Runnable, RunnableMap, RunnablePassthrough
 from langchain_core.tools import BaseTool
 from langchain_core.utils import convert_to_secret_str, get_from_dict_or_env
 from langchain_core.utils.function_calling import convert_to_openai_tool
+from langchain_core.utils.pydantic import is_basemodel_subclass
 
 logger = logging.getLogger(__name__)
 
@@ -769,7 +775,7 @@ class QianfanChatEndpoint(BaseChatModel):
         """  # noqa: E501
         if kwargs:
             raise ValueError(f"Received unsupported arguments {kwargs}")
-        is_pydantic_schema = isinstance(schema, type) and issubclass(schema, BaseModel)
+        is_pydantic_schema = isinstance(schema, type) and is_basemodel_subclass(schema)
         llm = self.bind_tools([schema])
         if is_pydantic_schema:
             output_parser: OutputParserLike = PydanticToolsParser(

libs/community/langchain_community/chat_models/edenai.py

@@ -57,6 +57,7 @@ from langchain_core.runnables import Runnable, RunnableMap, RunnablePassthrough
 from langchain_core.tools import BaseTool
 from langchain_core.utils import convert_to_secret_str, get_from_dict_or_env, pre_init
 from langchain_core.utils.function_calling import convert_to_openai_tool
+from langchain_core.utils.pydantic import is_basemodel_subclass
 
 from langchain_community.utilities.requests import Requests
 
@@ -443,7 +444,7 @@ class ChatEdenAI(BaseChatModel):
         if kwargs:
             raise ValueError(f"Received unsupported arguments {kwargs}")
         llm = self.bind_tools([schema], tool_choice="required")
-        if isinstance(schema, type) and issubclass(schema, BaseModel):
+        if isinstance(schema, type) and is_basemodel_subclass(schema):
             output_parser: OutputParserLike = PydanticToolsParser(
                 tools=[schema], first_tool_only=True
             )

libs/community/langchain_community/chat_models/llamacpp.py

@@ -46,10 +46,15 @@ from langchain_core.output_parsers.openai_tools import (
     parse_tool_call,
 )
 from langchain_core.outputs import ChatGeneration, ChatGenerationChunk, ChatResult
-from langchain_core.pydantic_v1 import BaseModel, Field, root_validator
+from langchain_core.pydantic_v1 import (
+    BaseModel,
+    Field,
+    root_validator,
+)
 from langchain_core.runnables import Runnable, RunnableMap, RunnablePassthrough
 from langchain_core.tools import BaseTool
 from langchain_core.utils.function_calling import convert_to_openai_tool
+from langchain_core.utils.pydantic import is_basemodel_subclass
 
 
 class ChatLlamaCpp(BaseChatModel):
@@ -525,7 +530,7 @@ class ChatLlamaCpp(BaseChatModel):
 
         if kwargs:
             raise ValueError(f"Received unsupported arguments {kwargs}")
-        is_pydantic_schema = isinstance(schema, type) and issubclass(schema, BaseModel)
+        is_pydantic_schema = isinstance(schema, type) and is_basemodel_subclass(schema)
         if schema is None:
             raise ValueError(
                 "schema must be specified when method is 'function_calling'. "

libs/community/langchain_community/chat_models/tongyi.py

@@ -53,11 +53,16 @@ from langchain_core.outputs import (
     ChatGenerationChunk,
     ChatResult,
 )
-from langchain_core.pydantic_v1 import BaseModel, Field, SecretStr
+from langchain_core.pydantic_v1 import (
+    BaseModel,
+    Field,
+    SecretStr,
+)
 from langchain_core.runnables import Runnable, RunnableMap, RunnablePassthrough
 from langchain_core.tools import BaseTool
 from langchain_core.utils import convert_to_secret_str, get_from_dict_or_env, pre_init
 from langchain_core.utils.function_calling import convert_to_openai_tool
+from langchain_core.utils.pydantic import is_basemodel_subclass
 from requests.exceptions import HTTPError
 from tenacity import (
     before_sleep_log,
@@ -865,7 +870,7 @@ class ChatTongyi(BaseChatModel):
         """
         if kwargs:
             raise ValueError(f"Received unsupported arguments {kwargs}")
-        is_pydantic_schema = isinstance(schema, type) and issubclass(schema, BaseModel)
+        is_pydantic_schema = isinstance(schema, type) and is_basemodel_subclass(schema)
         llm = self.bind_tools([schema])
         if is_pydantic_schema:
             output_parser: OutputParserLike = PydanticToolsParser(