Source code for langchain.chains.llm
"""Chain that just formats a prompt and calls an LLM."""
from __future__ import annotations
from typing import Any, Dict, List, Optional, Sequence, Tuple, Union
from pydantic import Extra
from langchain.base_language import BaseLanguageModel
from langchain.callbacks.manager import (
    AsyncCallbackManager,
    AsyncCallbackManagerForChainRun,
    CallbackManager,
    CallbackManagerForChainRun,
    Callbacks,
)
from langchain.chains.base import Chain
from langchain.input import get_colored_text
from langchain.prompts.base import BasePromptTemplate
from langchain.prompts.prompt import PromptTemplate
from langchain.schema import LLMResult, PromptValue
[docs]class LLMChain(Chain):
    """Chain to run queries against LLMs.
    Example:
        .. code-block:: python
            from langchain import LLMChain, OpenAI, PromptTemplate
            prompt_template = "Tell me a {adjective} joke"
            prompt = PromptTemplate(
                input_variables=["adjective"], template=prompt_template
            )
            llm = LLMChain(llm=OpenAI(), prompt=prompt)
    """
    prompt: BasePromptTemplate
    """Prompt object to use."""
    llm: BaseLanguageModel
    output_key: str = "text"  #: :meta private:
    class Config:
        """Configuration for this pydantic object."""
        extra = Extra.forbid
        arbitrary_types_allowed = True
    @property
    def input_keys(self) -> List[str]:
        """Will be whatever keys the prompt expects.
        :meta private:
        """
        return self.prompt.input_variables
    @property
    def output_keys(self) -> List[str]:
        """Will always return text key.
def output_keys(self) -> List[str]:
        """Will always return text key.
        :meta private:
        """
        return [self.output_key]
    def _call(
        self,
        inputs: Dict[str, Any],
        run_manager: Optional[CallbackManagerForChainRun] = None,
    ) -> Dict[str, str]:
        response = self.generate([inputs], run_manager=run_manager)
        return self.create_outputs(response)[0]
[docs]    def generate(
        self,
        input_list: List[Dict[str, Any]],
        run_manager: Optional[CallbackManagerForChainRun] = None,
    ) -> LLMResult:
        """Generate LLM result from inputs."""
        prompts, stop = self.prep_prompts(input_list, run_manager=run_manager)
        return self.llm.generate_prompt(
            prompts, stop, callbacks=run_manager.get_child() if run_manager else None
        )
[docs]    async def agenerate(
        self,
        input_list: List[Dict[str, Any]],
        run_manager: Optional[AsyncCallbackManagerForChainRun] = None,
    ) -> LLMResult:
        """Generate LLM result from inputs."""
        prompts, stop = await self.aprep_prompts(input_list, run_manager=run_manager)
        return await self.llm.agenerate_prompt(
            prompts, stop, callbacks=run_manager.get_child() if run_manager else None
        )
[docs]    def prep_prompts(
        self,
        input_list: List[Dict[str, Any]],
        run_manager: Optional[CallbackManagerForChainRun] = None,
    ) -> Tuple[List[PromptValue], Optional[List[str]]]:
        """Prepare prompts from inputs."""
        stop = None
"""Prepare prompts from inputs."""
        stop = None
        if "stop" in input_list[0]:
            stop = input_list[0]["stop"]
        prompts = []
        for inputs in input_list:
            selected_inputs = {k: inputs[k] for k in self.prompt.input_variables}
            prompt = self.prompt.format_prompt(**selected_inputs)
            _colored_text = get_colored_text(prompt.to_string(), "green")
            _text = "Prompt after formatting:\n" + _colored_text
            if run_manager:
                run_manager.on_text(_text, end="\n", verbose=self.verbose)
            if "stop" in inputs and inputs["stop"] != stop:
                raise ValueError(
                    "If `stop` is present in any inputs, should be present in all."
                )
            prompts.append(prompt)
        return prompts, stop
[docs]    async def aprep_prompts(
        self,
        input_list: List[Dict[str, Any]],
        run_manager: Optional[AsyncCallbackManagerForChainRun] = None,
    ) -> Tuple[List[PromptValue], Optional[List[str]]]:
        """Prepare prompts from inputs."""
        stop = None
        if "stop" in input_list[0]:
            stop = input_list[0]["stop"]
        prompts = []
        for inputs in input_list:
            selected_inputs = {k: inputs[k] for k in self.prompt.input_variables}
            prompt = self.prompt.format_prompt(**selected_inputs)
            _colored_text = get_colored_text(prompt.to_string(), "green")
            _text = "Prompt after formatting:\n" + _colored_text
            if run_manager:
                await run_manager.on_text(_text, end="\n", verbose=self.verbose)
await run_manager.on_text(_text, end="\n", verbose=self.verbose)
            if "stop" in inputs and inputs["stop"] != stop:
                raise ValueError(
                    "If `stop` is present in any inputs, should be present in all."
                )
            prompts.append(prompt)
        return prompts, stop
[docs]    def apply(
        self, input_list: List[Dict[str, Any]], callbacks: Callbacks = None
    ) -> List[Dict[str, str]]:
        """Utilize the LLM generate method for speed gains."""
        callback_manager = CallbackManager.configure(
            callbacks, self.callbacks, self.verbose
        )
        run_manager = callback_manager.on_chain_start(
            {"name": self.__class__.__name__},
            {"input_list": input_list},
        )
        try:
            response = self.generate(input_list, run_manager=run_manager)
        except (KeyboardInterrupt, Exception) as e:
            run_manager.on_chain_error(e)
            raise e
        outputs = self.create_outputs(response)
        run_manager.on_chain_end({"outputs": outputs})
        return outputs
[docs]    async def aapply(
        self, input_list: List[Dict[str, Any]], callbacks: Callbacks = None
    ) -> List[Dict[str, str]]:
        """Utilize the LLM generate method for speed gains."""
        callback_manager = AsyncCallbackManager.configure(
            callbacks, self.callbacks, self.verbose
        )
        run_manager = await callback_manager.on_chain_start(
            {"name": self.__class__.__name__},
            {"input_list": input_list},
        )
        try:
            response = await self.agenerate(input_list, run_manager=run_manager)
        except (KeyboardInterrupt, Exception) as e:
except (KeyboardInterrupt, Exception) as e:
            await run_manager.on_chain_error(e)
            raise e
        outputs = self.create_outputs(response)
        await run_manager.on_chain_end({"outputs": outputs})
        return outputs
[docs]    def create_outputs(self, response: LLMResult) -> List[Dict[str, str]]:
        """Create outputs from response."""
        return [
            # Get the text of the top generated string.
            {self.output_key: generation[0].text}
            for generation in response.generations
        ]
    async def _acall(
        self,
        inputs: Dict[str, Any],
        run_manager: Optional[AsyncCallbackManagerForChainRun] = None,
    ) -> Dict[str, str]:
        response = await self.agenerate([inputs], run_manager=run_manager)
        return self.create_outputs(response)[0]
[docs]    def predict(self, callbacks: Callbacks = None, **kwargs: Any) -> str:
        """Format prompt with kwargs and pass to LLM.
        Args:
            callbacks: Callbacks to pass to LLMChain
            **kwargs: Keys to pass to prompt template.
        Returns:
            Completion from LLM.
        Example:
            .. code-block:: python
                completion = llm.predict(adjective="funny")
        """
        return self(kwargs, callbacks=callbacks)[self.output_key]
[docs]    async def apredict(self, callbacks: Callbacks = None, **kwargs: Any) -> str:
        """Format prompt with kwargs and pass to LLM.
        Args:
            callbacks: Callbacks to pass to LLMChain
            **kwargs: Keys to pass to prompt template.
        Returns:
            Completion from LLM.
        Example:
Returns:
            Completion from LLM.
        Example:
            .. code-block:: python
                completion = llm.predict(adjective="funny")
        """
        return (await self.acall(kwargs, callbacks=callbacks))[self.output_key]
[docs]    def predict_and_parse(
        self, callbacks: Callbacks = None, **kwargs: Any
    ) -> Union[str, List[str], Dict[str, Any]]:
        """Call predict and then parse the results."""
        result = self.predict(callbacks=callbacks, **kwargs)
        if self.prompt.output_parser is not None:
            return self.prompt.output_parser.parse(result)
        else:
            return result
[docs]    async def apredict_and_parse(
        self, callbacks: Callbacks = None, **kwargs: Any
    ) -> Union[str, List[str], Dict[str, str]]:
        """Call apredict and then parse the results."""
        result = await self.apredict(callbacks=callbacks, **kwargs)
        if self.prompt.output_parser is not None:
            return self.prompt.output_parser.parse(result)
        else:
            return result
[docs]    def apply_and_parse(
        self, input_list: List[Dict[str, Any]], callbacks: Callbacks = None
    ) -> Sequence[Union[str, List[str], Dict[str, str]]]:
        """Call apply and then parse the results."""
        result = self.apply(input_list, callbacks=callbacks)
        return self._parse_result(result)
    def _parse_result(
        self, result: List[Dict[str, str]]
    ) -> Sequence[Union[str, List[str], Dict[str, str]]]:
        if self.prompt.output_parser is not None:
            return [
                self.prompt.output_parser.parse(res[self.output_key]) for res in result
return [
                self.prompt.output_parser.parse(res[self.output_key]) for res in result
            ]
        else:
            return result
[docs]    async def aapply_and_parse(
        self, input_list: List[Dict[str, Any]], callbacks: Callbacks = None
    ) -> Sequence[Union[str, List[str], Dict[str, str]]]:
        """Call apply and then parse the results."""
        result = await self.aapply(input_list, callbacks=callbacks)
        return self._parse_result(result)
    @property
    def _chain_type(self) -> str:
        return "llm_chain"
[docs]    @classmethod
    def from_string(cls, llm: BaseLanguageModel, template: str) -> Chain:
        """Create LLMChain from LLM and template."""
        prompt_template = PromptTemplate.from_template(template)
        return cls(llm=llm, prompt=prompt_template)
By Harrison Chase