mirror of
https://github.com/hwchase17/langchain
synced 2024-11-18 09:25:54 +00:00
128 lines
4.3 KiB
Python
128 lines
4.3 KiB
Python
"""Chain that interprets a prompt and executes bash operations."""
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from __future__ import annotations
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import logging
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import warnings
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from typing import Any, Dict, List, Optional
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from langchain.callbacks.manager import CallbackManagerForChainRun
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from langchain.chains.base import Chain
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from langchain.chains.llm import LLMChain
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from langchain.schema import BasePromptTemplate, OutputParserException
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from langchain.schema.language_model import BaseLanguageModel
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from langchain_experimental.llm_bash.bash import BashProcess
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from langchain_experimental.llm_bash.prompt import PROMPT
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from langchain_experimental.pydantic_v1 import Extra, Field, root_validator
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logger = logging.getLogger(__name__)
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class LLMBashChain(Chain):
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"""Chain that interprets a prompt and executes bash operations.
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Example:
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.. code-block:: python
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from langchain.chains import LLMBashChain
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from langchain.llms import OpenAI
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llm_bash = LLMBashChain.from_llm(OpenAI())
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"""
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llm_chain: LLMChain
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llm: Optional[BaseLanguageModel] = None
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"""[Deprecated] LLM wrapper to use."""
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input_key: str = "question" #: :meta private:
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output_key: str = "answer" #: :meta private:
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prompt: BasePromptTemplate = PROMPT
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"""[Deprecated]"""
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bash_process: BashProcess = Field(default_factory=BashProcess) #: :meta private:
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class Config:
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"""Configuration for this pydantic object."""
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extra = Extra.forbid
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arbitrary_types_allowed = True
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@root_validator(pre=True)
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def raise_deprecation(cls, values: Dict) -> Dict:
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if "llm" in values:
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warnings.warn(
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"Directly instantiating an LLMBashChain with an llm is deprecated. "
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"Please instantiate with llm_chain or using the from_llm class method."
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)
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if "llm_chain" not in values and values["llm"] is not None:
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prompt = values.get("prompt", PROMPT)
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values["llm_chain"] = LLMChain(llm=values["llm"], prompt=prompt)
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return values
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# TODO: move away from `root_validator` since it is deprecated in pydantic v2
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# and causes mypy type-checking failures (hence the `type: ignore`)
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@root_validator # type: ignore[call-overload]
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def validate_prompt(cls, values: Dict) -> Dict:
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if values["llm_chain"].prompt.output_parser is None:
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raise ValueError(
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"The prompt used by llm_chain is expected to have an output_parser."
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)
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return values
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@property
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def input_keys(self) -> List[str]:
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"""Expect input key.
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:meta private:
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"""
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return [self.input_key]
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@property
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def output_keys(self) -> List[str]:
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"""Expect output key.
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:meta private:
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"""
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return [self.output_key]
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def _call(
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self,
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inputs: Dict[str, Any],
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run_manager: Optional[CallbackManagerForChainRun] = None,
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) -> Dict[str, str]:
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_run_manager = run_manager or CallbackManagerForChainRun.get_noop_manager()
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_run_manager.on_text(inputs[self.input_key], verbose=self.verbose)
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t = self.llm_chain.predict(
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question=inputs[self.input_key], callbacks=_run_manager.get_child()
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)
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_run_manager.on_text(t, color="green", verbose=self.verbose)
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t = t.strip()
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try:
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parser = self.llm_chain.prompt.output_parser
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command_list = parser.parse(t) # type: ignore[union-attr]
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except OutputParserException as e:
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_run_manager.on_chain_error(e, verbose=self.verbose)
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raise e
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if self.verbose:
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_run_manager.on_text("\nCode: ", verbose=self.verbose)
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_run_manager.on_text(
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str(command_list), color="yellow", verbose=self.verbose
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)
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output = self.bash_process.run(command_list)
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_run_manager.on_text("\nAnswer: ", verbose=self.verbose)
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_run_manager.on_text(output, color="yellow", verbose=self.verbose)
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return {self.output_key: output}
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@property
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def _chain_type(self) -> str:
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return "llm_bash_chain"
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@classmethod
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def from_llm(
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cls,
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llm: BaseLanguageModel,
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prompt: BasePromptTemplate = PROMPT,
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**kwargs: Any,
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) -> LLMBashChain:
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llm_chain = LLMChain(llm=llm, prompt=prompt)
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return cls(llm_chain=llm_chain, **kwargs)
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