multiple: pydantic 2 compatibility, v0.3 (#26443)

Signed-off-by: ChengZi <chen.zhang@zilliz.com>
Co-authored-by: Eugene Yurtsev <eyurtsev@gmail.com>
Co-authored-by: Bagatur <22008038+baskaryan@users.noreply.github.com>
Co-authored-by: Dan O'Donovan <dan.odonovan@gmail.com>
Co-authored-by: Tom Daniel Grande <tomdgrande@gmail.com>
Co-authored-by: Grande <Tom.Daniel.Grande@statsbygg.no>
Co-authored-by: Bagatur <baskaryan@gmail.com>
Co-authored-by: ccurme <chester.curme@gmail.com>
Co-authored-by: Harrison Chase <hw.chase.17@gmail.com>
Co-authored-by: Tomaz Bratanic <bratanic.tomaz@gmail.com>
Co-authored-by: ZhangShenao <15201440436@163.com>
Co-authored-by: Friso H. Kingma <fhkingma@gmail.com>
Co-authored-by: ChengZi <chen.zhang@zilliz.com>
Co-authored-by: Nuno Campos <nuno@langchain.dev>
Co-authored-by: Morgante Pell <morgantep@google.com>

libs/experimental/langchain_experimental/smart_llm/base.py

@@ -14,8 +14,7 @@ from langchain_core.prompts.chat import (
     ChatPromptTemplate,
     HumanMessagePromptTemplate,
 )
-
-from langchain_experimental.pydantic_v1 import root_validator
+from pydantic import ConfigDict, model_validator
 
 
 class SmartLLMChain(Chain):
@@ -83,14 +82,13 @@ class SmartLLMChain(Chain):
     """Whether to return ideas and critique, in addition to resolution."""
     history: SmartLLMChainHistory = SmartLLMChainHistory()
 
-    class Config:
-        extra = "forbid"
+    model_config = ConfigDict(
+        extra="forbid",
+    )
 
-    # TODO: move away from `root_validator` since it is deprecated in pydantic v2
-    #       and causes mypy type-checking failures (hence the `type: ignore`)
-    @root_validator  # type: ignore[call-overload]
+    @model_validator(mode="before")
     @classmethod
-    def validate_inputs(cls, values: Dict[str, Any]) -> Dict[str, Any]:
+    def validate_inputs(cls, values: Dict[str, Any]) -> Any:
         """Ensure we have an LLM for each step."""
         llm = values.get("llm")
         ideation_llm = values.get("ideation_llm")