viruPVS/langchain-docs huggingface dataset:
\"\"\"Record some identifying information about a person.\"\"\"
                    name: str = Field(..., description="The person's name")
                    age: int = Field(..., description="The person's age")
                    fav_food: Optional[str] = Field(None, description="The person's favorite food")
                class RecordDog(BaseModel):
                    \"\"\"Record some identifying information about a dog.\"\"\"
                    name: str = Field(..., description="The dog's name")
                    color: str = Field(..., description="The dog's color")
                    fav_food: Optional[str] = Field(None, description="The dog's favorite food")
                llm = ChatOpenAI(model="gpt-4", temperature=0)
                prompt = ChatPromptTemplate.from_messages(
                    [
                        ("system", "You are a world class algorithm for recording entities."),
                        ("human", "Make calls to the relevant function to record the entities in the following input: {input}"),
                        ("human", "Tip: Make sure to answer in the correct format"),
                    ]
                )
                chain = create_openai_fn_runnable([RecordPerson, RecordDog], llm, prompt)
                chain.invoke({"input": "Harry was a chubby brown beagle who loved chicken"})
                # -> RecordDog(name="Harry", color="brown", fav_food="chicken")
    """  # noqa: E501
    if not functions:
        raise ValueError("Need to pass in at least one function. Received zero.")
    openai_functions = [convert_to_openai_function(f) for f in functions]
    llm_kwargs: Dict[str, Any] = {"functions": openai_functions, **kwargs}
    if len(openai_functions) == 1 and enforce_single_function_usage:
if len(openai_functions) == 1 and enforce_single_function_usage:
        llm_kwargs["function_call"] = {"name": openai_functions[0]["name"]}
    output_parser = output_parser or get_openai_output_parser(functions)
    return prompt | llm.bind(**llm_kwargs) | output_parser
[docs]def create_structured_output_runnable(
    output_schema: Union[Dict[str, Any], Type[BaseModel]],
    llm: Runnable,
    prompt: BasePromptTemplate,
    *,
    output_parser: Optional[Union[BaseOutputParser, BaseGenerationOutputParser]] = None,
    **kwargs: Any,
) -> Runnable:
    """Create a runnable that uses an OpenAI function to get a structured output.
    Args:
        output_schema: Either a dictionary or pydantic.BaseModel class. If a dictionary
            is passed in, it's assumed to already be a valid JsonSchema.
            For best results, pydantic.BaseModels should have docstrings describing what
            the schema represents and descriptions for the parameters.
        llm: Language model to use, assumed to support the OpenAI function-calling API.
        prompt: BasePromptTemplate to pass to the model.
        output_parser: BaseLLMOutputParser to use for parsing model outputs. By default
            will be inferred from the function types. If pydantic.BaseModels are passed
            in, then the OutputParser will try to parse outputs using those. Otherwise
            model outputs will simply be parsed as JSON.
    Returns:
        A runnable sequence that will pass the given function to the model when run.
    Example:
        .. code-block:: python
                from typing import Optional
                from langchain.chains.openai_functions import create_structured_output_chain
                from langchain.chat_models import ChatOpenAI
from langchain.chat_models import ChatOpenAI
                from langchain_core.prompts import ChatPromptTemplate
                from langchain_core.pydantic_v1 import BaseModel, Field
                class Dog(BaseModel):
                    \"\"\"Identifying information about a dog.\"\"\"
                    name: str = Field(..., description="The dog's name")
                    color: str = Field(..., description="The dog's color")
                    fav_food: Optional[str] = Field(None, description="The dog's favorite food")
                llm = ChatOpenAI(model="gpt-3.5-turbo-0613", temperature=0)
                prompt = ChatPromptTemplate.from_messages(
                    [
                        ("system", "You are a world class algorithm for extracting information in structured formats."),
                        ("human", "Use the given format to extract information from the following input: {input}"),
                        ("human", "Tip: Make sure to answer in the correct format"),
                    ]
                )
                chain = create_structured_output_chain(Dog, llm, prompt)
                chain.invoke({"input": "Harry was a chubby brown beagle who loved chicken"})
                # -> Dog(name="Harry", color="brown", fav_food="chicken")
    """  # noqa: E501
    if isinstance(output_schema, dict):
        function: Any = {
            "name": "output_formatter",
            "description": (
                "Output formatter. Should always be used to format your response to the"
                " user."
            ),
            "parameters": output_schema,
        }
    else:
        class _OutputFormatter(BaseModel):
            """Output formatter. Should always be used to format your response to the user."""  # noqa: E501
            output: output_schema  # type: ignore
output: output_schema  # type: ignore
        function = _OutputFormatter
        output_parser = output_parser or PydanticAttrOutputFunctionsParser(
            pydantic_schema=_OutputFormatter, attr_name="output"
        )
    return create_openai_fn_runnable(
        [function],
        llm,
        prompt,
        output_parser=output_parser,
        **kwargs,
    )
""" --- Legacy --- """
[docs]def create_openai_fn_chain(
    functions: Sequence[Union[Dict[str, Any], Type[BaseModel], Callable]],
    llm: BaseLanguageModel,
    prompt: BasePromptTemplate,
    *,
    enforce_single_function_usage: bool = True,
    output_key: str = "function",
    output_parser: Optional[BaseLLMOutputParser] = None,
    **kwargs: Any,
) -> LLMChain:
    """[Legacy] Create an LLM chain that uses OpenAI functions.
    Args:
        functions: A sequence of either dictionaries, pydantic.BaseModels classes, or
            Python functions. If dictionaries are passed in, they are assumed to
            already be a valid OpenAI functions. If only a single
            function is passed in, then it will be enforced that the model use that
            function. pydantic.BaseModels and Python functions should have docstrings
            describing what the function does. For best results, pydantic.BaseModels
            should have descriptions of the parameters and Python functions should have
            Google Python style args descriptions in the docstring. Additionally,
            Python functions should only use primitive types (str, int, float, bool) or
            pydantic.BaseModels for arguments.
        llm: Language model to use, assumed to support the OpenAI function-calling API.
prompt: BasePromptTemplate to pass to the model.
        enforce_single_function_usage: only used if a single function is passed in. If
            True, then the model will be forced to use the given function. If False,
            then the model will be given the option to use the given function or not.
        output_key: The key to use when returning the output in LLMChain.__call__.
        output_parser: BaseLLMOutputParser to use for parsing model outputs. By default
            will be inferred from the function types. If pydantic.BaseModels are passed
            in, then the OutputParser will try to parse outputs using those. Otherwise
            model outputs will simply be parsed as JSON. If multiple functions are
            passed in and they are not pydantic.BaseModels, the chain output will
            include both the name of the function that was returned and the arguments
            to pass to the function.
    Returns:
        An LLMChain that will pass in the given functions to the model when run.
    Example:
        .. code-block:: python
                from typing import Optional
                from langchain.chains.openai_functions import create_openai_fn_chain
                from langchain.chat_models import ChatOpenAI
                from langchain_core.prompts import ChatPromptTemplate
                from langchain_core.pydantic_v1 import BaseModel, Field
                class RecordPerson(BaseModel):
                    \"\"\"Record some identifying information about a person.\"\"\"
                    name: str = Field(..., description="The person's name")
                    age: int = Field(..., description="The person's age")
                    fav_food: Optional[str] = Field(None, description="The person's favorite food")
                class RecordDog(BaseModel):
                    \"\"\"Record some identifying information about a dog.\"\"\"
\"\"\"Record some identifying information about a dog.\"\"\"
                    name: str = Field(..., description="The dog's name")
                    color: str = Field(..., description="The dog's color")
                    fav_food: Optional[str] = Field(None, description="The dog's favorite food")
                llm = ChatOpenAI(model="gpt-4", temperature=0)
                prompt = ChatPromptTemplate.from_messages(
                    [
                        ("system", "You are a world class algorithm for recording entities."),
                        ("human", "Make calls to the relevant function to record the entities in the following input: {input}"),
                        ("human", "Tip: Make sure to answer in the correct format"),
                    ]
                )
                chain = create_openai_fn_chain([RecordPerson, RecordDog], llm, prompt)
                chain.run("Harry was a chubby brown beagle who loved chicken")
                # -> RecordDog(name="Harry", color="brown", fav_food="chicken")
    """  # noqa: E501
    if not functions:
        raise ValueError("Need to pass in at least one function. Received zero.")
    openai_functions = [convert_to_openai_function(f) for f in functions]
    output_parser = output_parser or get_openai_output_parser(functions)
    llm_kwargs: Dict[str, Any] = {
        "functions": openai_functions,
    }
    if len(openai_functions) == 1 and enforce_single_function_usage:
        llm_kwargs["function_call"] = {"name": openai_functions[0]["name"]}
    llm_chain = LLMChain(
        llm=llm,
        prompt=prompt,
        output_parser=output_parser,
        llm_kwargs=llm_kwargs,
        output_key=output_key,
llm_kwargs=llm_kwargs,
        output_key=output_key,
        **kwargs,
    )
    return llm_chain
[docs]def create_structured_output_chain(
    output_schema: Union[Dict[str, Any], Type[BaseModel]],
    llm: BaseLanguageModel,
    prompt: BasePromptTemplate,
    *,
    output_key: str = "function",
    output_parser: Optional[BaseLLMOutputParser] = None,
    **kwargs: Any,
) -> LLMChain:
    """[Legacy] Create an LLMChain that uses an OpenAI function to get a structured output.
    Args:
        output_schema: Either a dictionary or pydantic.BaseModel class. If a dictionary
            is passed in, it's assumed to already be a valid JsonSchema.
            For best results, pydantic.BaseModels should have docstrings describing what
            the schema represents and descriptions for the parameters.
        llm: Language model to use, assumed to support the OpenAI function-calling API.
        prompt: BasePromptTemplate to pass to the model.
        output_key: The key to use when returning the output in LLMChain.__call__.
        output_parser: BaseLLMOutputParser to use for parsing model outputs. By default
            will be inferred from the function types. If pydantic.BaseModels are passed
            in, then the OutputParser will try to parse outputs using those. Otherwise
            model outputs will simply be parsed as JSON.
    Returns:
        An LLMChain that will pass the given function to the model.
    Example:
        .. code-block:: python
                from typing import Optional
                from langchain.chains.openai_functions import create_structured_output_chain
                from langchain.chat_models import ChatOpenAI
from langchain.chat_models import ChatOpenAI
                from langchain_core.prompts import ChatPromptTemplate
                from langchain_core.pydantic_v1 import BaseModel, Field
                class Dog(BaseModel):
                    \"\"\"Identifying information about a dog.\"\"\"
                    name: str = Field(..., description="The dog's name")
                    color: str = Field(..., description="The dog's color")
                    fav_food: Optional[str] = Field(None, description="The dog's favorite food")
                llm = ChatOpenAI(model="gpt-3.5-turbo-0613", temperature=0)
                prompt = ChatPromptTemplate.from_messages(
                    [
                        ("system", "You are a world class algorithm for extracting information in structured formats."),
                        ("human", "Use the given format to extract information from the following input: {input}"),
                        ("human", "Tip: Make sure to answer in the correct format"),
                    ]
                )
                chain = create_structured_output_chain(Dog, llm, prompt)
                chain.run("Harry was a chubby brown beagle who loved chicken")
                # -> Dog(name="Harry", color="brown", fav_food="chicken")
    """  # noqa: E501
    if isinstance(output_schema, dict):
        function: Any = {
            "name": "output_formatter",
            "description": (
                "Output formatter. Should always be used to format your response to the"
                " user."
            ),
            "parameters": output_schema,
        }
    else:
        class _OutputFormatter(BaseModel):
            """Output formatter. Should always be used to format your response to the user."""  # noqa: E501
            output: output_schema  # type: ignore
        function = _OutputFormatter
output: output_schema  # type: ignore
        function = _OutputFormatter
        output_parser = output_parser or PydanticAttrOutputFunctionsParser(
            pydantic_schema=_OutputFormatter, attr_name="output"
        )
    return create_openai_fn_chain(
        [function],
        llm,
        prompt,
        output_key=output_key,
        output_parser=output_parser,
        **kwargs,
    )
Source code for langchain.chains.openai_functions.openapi
from __future__ import annotations
import json
import re
from collections import defaultdict
from typing import TYPE_CHECKING, Any, Callable, Dict, List, Optional, Tuple, Union
import requests
from langchain_core.language_models import BaseLanguageModel
from langchain_core.prompts import BasePromptTemplate, ChatPromptTemplate
from langchain_core.utils.input import get_colored_text
from requests import Response
from langchain.callbacks.manager import CallbackManagerForChainRun
from langchain.chains.base import Chain
from langchain.chains.llm import LLMChain
from langchain.chains.sequential import SequentialChain
from langchain.chat_models import ChatOpenAI
from langchain.output_parsers.openai_functions import JsonOutputFunctionsParser
from langchain.tools import APIOperation
from langchain.utilities.openapi import OpenAPISpec
if TYPE_CHECKING:
    from openapi_pydantic import Parameter
def _get_description(o: Any, prefer_short: bool) -> Optional[str]:
    summary = getattr(o, "summary", None)
    description = getattr(o, "description", None)
    if prefer_short:
        return summary or description
    return description or summary
def _format_url(url: str, path_params: dict) -> str:
    expected_path_param = re.findall(r"{(.*?)}", url)
    new_params = {}
    for param in expected_path_param:
        clean_param = param.lstrip(".;").rstrip("*")
        val = path_params[clean_param]
        if isinstance(val, list):
            if param[0] == ".":
                sep = "." if param[-1] == "*" else ","
                new_val = "." + sep.join(val)
            elif param[0] == ";":
elif param[0] == ";":
                sep = f"{clean_param}=" if param[-1] == "*" else ","
                new_val = f"{clean_param}=" + sep.join(val)
            else:
                new_val = ",".join(val)
        elif isinstance(val, dict):
            kv_sep = "=" if param[-1] == "*" else ","
            kv_strs = [kv_sep.join((k, v)) for k, v in val.items()]
            if param[0] == ".":
                sep = "."
                new_val = "."
            elif param[0] == ";":
                sep = ";"
                new_val = ";"
            else:
                sep = ","
                new_val = ""
            new_val += sep.join(kv_strs)
        else:
            if param[0] == ".":
                new_val = f".{val}"
            elif param[0] == ";":
                new_val = f";{clean_param}={val}"
            else:
                new_val = val
        new_params[param] = new_val
    return url.format(**new_params)
def _openapi_params_to_json_schema(params: List[Parameter], spec: OpenAPISpec) -> dict:
    properties = {}
    required = []
    for p in params:
        if p.param_schema:
            schema = spec.get_schema(p.param_schema)
        else:
            media_type_schema = list(p.content.values())[0].media_type_schema  # type: ignore  # noqa: E501
            schema = spec.get_schema(media_type_schema)
        if p.description and not schema.description:
            schema.description = p.description
        properties[p.name] = json.loads(schema.json(exclude_none=True))
        if p.required:
            required.append(p.name)
if p.required:
            required.append(p.name)
    return {"type": "object", "properties": properties, "required": required}
[docs]def openapi_spec_to_openai_fn(
    spec: OpenAPISpec,
) -> Tuple[List[Dict[str, Any]], Callable]:
    """Convert a valid OpenAPI spec to the JSON Schema format expected for OpenAI
        functions.
    Args:
        spec: OpenAPI spec to convert.
    Returns:
        Tuple of the OpenAI functions JSON schema and a default function for executing
            a request based on the OpenAI function schema.
    """
    if not spec.paths:
        return [], lambda: None
    functions = []
    _name_to_call_map = {}
    for path in spec.paths:
        path_params = {
            (p.name, p.param_in): p for p in spec.get_parameters_for_path(path)
        }
        for method in spec.get_methods_for_path(path):
            request_args = {}
            op = spec.get_operation(path, method)
            op_params = path_params.copy()
            for param in spec.get_parameters_for_operation(op):
                op_params[(param.name, param.param_in)] = param
            params_by_type = defaultdict(list)
            for name_loc, p in op_params.items():
                params_by_type[name_loc[1]].append(p)
            param_loc_to_arg_name = {
                "query": "params",
                "header": "headers",
                "cookie": "cookies",
                "path": "path_params",
            }
            for param_loc, arg_name in param_loc_to_arg_name.items():
                if params_by_type[param_loc]:
                    request_args[arg_name] = _openapi_params_to_json_schema(
                        params_by_type[param_loc], spec
                    )
params_by_type[param_loc], spec
                    )
            request_body = spec.get_request_body_for_operation(op)
            # TODO: Support more MIME types.
            if request_body and request_body.content:
                media_types = {}
                for media_type, media_type_object in request_body.content.items():
                    if media_type_object.media_type_schema:
                        schema = spec.get_schema(media_type_object.media_type_schema)
                        media_types[media_type] = json.loads(
                            schema.json(exclude_none=True)
                        )
                if len(media_types) == 1:
                    media_type, schema_dict = list(media_types.items())[0]
                    key = "json" if media_type == "application/json" else "data"
                    request_args[key] = schema_dict
                elif len(media_types) > 1:
                    request_args["data"] = {"anyOf": list(media_types.values())}
            api_op = APIOperation.from_openapi_spec(spec, path, method)
            fn = {
                "name": api_op.operation_id,
                "description": api_op.description,
                "parameters": {
                    "type": "object",
                    "properties": request_args,
                },
            }
            functions.append(fn)
            _name_to_call_map[fn["name"]] = {
                "method": method,
                "url": api_op.base_url + api_op.path,
            }
    def default_call_api(
        name: str,
        fn_args: dict,
        headers: Optional[dict] = None,
        params: Optional[dict] = None,
        **kwargs: Any,
    ) -> Any:
        method = _name_to_call_map[name]["method"]
        url = _name_to_call_map[name]["url"]
url = _name_to_call_map[name]["url"]
        path_params = fn_args.pop("path_params", {})
        url = _format_url(url, path_params)
        if "data" in fn_args and isinstance(fn_args["data"], dict):
            fn_args["data"] = json.dumps(fn_args["data"])
        _kwargs = {**fn_args, **kwargs}
        if headers is not None:
            if "headers" in _kwargs:
                _kwargs["headers"].update(headers)
            else:
                _kwargs["headers"] = headers
        if params is not None:
            if "params" in _kwargs:
                _kwargs["params"].update(params)
            else:
                _kwargs["params"] = params
        return requests.request(method, url, **_kwargs)
    return functions, default_call_api
[docs]class SimpleRequestChain(Chain):
    """Chain for making a simple request to an API endpoint."""
    request_method: Callable
    """Method to use for making the request."""
    output_key: str = "response"
    """Key to use for the output of the request."""
    input_key: str = "function"
    """Key to use for the input of the request."""
    @property
    def input_keys(self) -> List[str]:
        return [self.input_key]
    @property
    def output_keys(self) -> List[str]:
        return [self.output_key]
    def _call(
        self,
        inputs: Dict[str, Any],
        run_manager: Optional[CallbackManagerForChainRun] = None,
    ) -> Dict[str, Any]:
        """Run the logic of this chain and return the output."""
        _run_manager = run_manager or CallbackManagerForChainRun.get_noop_manager()