langchain Architecture Docs
Home / File/ base.py — langchain Source File

base.py — langchain Source File

Architecture documentation for base.py, a python file in the langchain codebase. 18 imports, 0 dependents.

File python CoreAbstractions RunnableInterface 18 imports 3 classes

Entity Profile

Dependency Diagram

graph LR
  d3aa4510_51a9_c393_bb4a_23fe112c52cd["base.py"]
  614e7b9f_ed51_0780_749c_ff40b74963fc["inspect"]
  d3aa4510_51a9_c393_bb4a_23fe112c52cd --> 614e7b9f_ed51_0780_749c_ff40b74963fc
  cccbe73e_4644_7211_4d55_e8fb133a8014["abc"]
  d3aa4510_51a9_c393_bb4a_23fe112c52cd --> cccbe73e_4644_7211_4d55_e8fb133a8014
  8e2034b7_ceb8_963f_29fc_2ea6b50ef9b3["typing"]
  d3aa4510_51a9_c393_bb4a_23fe112c52cd --> 8e2034b7_ceb8_963f_29fc_2ea6b50ef9b3
  b19a8b7e_fbee_95b1_65b8_509a1ed3cad7["langchain_core._api"]
  d3aa4510_51a9_c393_bb4a_23fe112c52cd --> b19a8b7e_fbee_95b1_65b8_509a1ed3cad7
  f3bc7443_c889_119d_0744_aacc3620d8d2["langchain_core.callbacks"]
  d3aa4510_51a9_c393_bb4a_23fe112c52cd --> f3bc7443_c889_119d_0744_aacc3620d8d2
  c554676d_b731_47b2_a98f_c1c2d537c0aa["langchain_core.documents"]
  d3aa4510_51a9_c393_bb4a_23fe112c52cd --> c554676d_b731_47b2_a98f_c1c2d537c0aa
  ba43b74d_3099_7e1c_aac3_cf594720469e["langchain_core.language_models"]
  d3aa4510_51a9_c393_bb4a_23fe112c52cd --> ba43b74d_3099_7e1c_aac3_cf594720469e
  e6b4f61e_7b98_6666_3641_26b069517d4a["langchain_core.prompts"]
  d3aa4510_51a9_c393_bb4a_23fe112c52cd --> e6b4f61e_7b98_6666_3641_26b069517d4a
  38bc5323_3713_7377_32f8_091293bea54b["langchain_core.retrievers"]
  d3aa4510_51a9_c393_bb4a_23fe112c52cd --> 38bc5323_3713_7377_32f8_091293bea54b
  d55af636_303c_0eb6_faee_20d89bd952d5["langchain_core.vectorstores"]
  d3aa4510_51a9_c393_bb4a_23fe112c52cd --> d55af636_303c_0eb6_faee_20d89bd952d5
  6e58aaea_f08e_c099_3cc7_f9567bfb1ae7["pydantic"]
  d3aa4510_51a9_c393_bb4a_23fe112c52cd --> 6e58aaea_f08e_c099_3cc7_f9567bfb1ae7
  91721f45_4909_e489_8c1f_084f8bd87145["typing_extensions"]
  d3aa4510_51a9_c393_bb4a_23fe112c52cd --> 91721f45_4909_e489_8c1f_084f8bd87145
  01158a5b_b299_f45d_92e9_2a7433a1a91a["langchain_classic.chains.base"]
  d3aa4510_51a9_c393_bb4a_23fe112c52cd --> 01158a5b_b299_f45d_92e9_2a7433a1a91a
  a0d4f6c3_2d96_364c_720a_e778ffd171a0["langchain_classic.chains.combine_documents.base"]
  d3aa4510_51a9_c393_bb4a_23fe112c52cd --> a0d4f6c3_2d96_364c_720a_e778ffd171a0
  style d3aa4510_51a9_c393_bb4a_23fe112c52cd fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

"""Chain for question-answering against a vector database."""

from __future__ import annotations

import inspect
from abc import abstractmethod
from typing import Any

from langchain_core._api import deprecated
from langchain_core.callbacks import (
    AsyncCallbackManagerForChainRun,
    CallbackManagerForChainRun,
    Callbacks,
)
from langchain_core.documents import Document
from langchain_core.language_models import BaseLanguageModel
from langchain_core.prompts import PromptTemplate
from langchain_core.retrievers import BaseRetriever
from langchain_core.vectorstores import VectorStore
from pydantic import ConfigDict, Field, model_validator
from typing_extensions import override

from langchain_classic.chains.base import Chain
from langchain_classic.chains.combine_documents.base import BaseCombineDocumentsChain
from langchain_classic.chains.combine_documents.stuff import StuffDocumentsChain
from langchain_classic.chains.llm import LLMChain
from langchain_classic.chains.question_answering import load_qa_chain
from langchain_classic.chains.question_answering.stuff_prompt import PROMPT_SELECTOR


@deprecated(
    since="0.2.13",
    removal="1.0",
    message=(
        "This class is deprecated. Use the `create_retrieval_chain` constructor "
        "instead. See migration guide here: "
        "https://python.langchain.com/docs/versions/migrating_chains/retrieval_qa/"
    ),
)
class BaseRetrievalQA(Chain):
    """Base class for question-answering chains."""

    combine_documents_chain: BaseCombineDocumentsChain
    """Chain to use to combine the documents."""
    input_key: str = "query"
    output_key: str = "result"
    return_source_documents: bool = False
    """Return the source documents or not."""

    model_config = ConfigDict(
        populate_by_name=True,
        arbitrary_types_allowed=True,
        extra="forbid",
    )

    @property
    def input_keys(self) -> list[str]:
        """Input keys."""
        return [self.input_key]

// ... (309 more lines)

Domain

Subdomains

Classes

Dependencies

  • abc
  • inspect
  • langchain_classic.chains.base
  • langchain_classic.chains.combine_documents.base
  • langchain_classic.chains.combine_documents.stuff
  • langchain_classic.chains.llm
  • langchain_classic.chains.question_answering
  • langchain_classic.chains.question_answering.stuff_prompt
  • langchain_core._api
  • langchain_core.callbacks
  • langchain_core.documents
  • langchain_core.language_models
  • langchain_core.prompts
  • langchain_core.retrievers
  • langchain_core.vectorstores
  • pydantic
  • typing
  • typing_extensions

Source

Frequently Asked Questions

What does base.py do?
base.py is a source file in the langchain codebase, written in python. It belongs to the CoreAbstractions domain, RunnableInterface subdomain.
What does base.py depend on?
base.py imports 18 module(s): abc, inspect, langchain_classic.chains.base, langchain_classic.chains.combine_documents.base, langchain_classic.chains.combine_documents.stuff, langchain_classic.chains.llm, langchain_classic.chains.question_answering, langchain_classic.chains.question_answering.stuff_prompt, and 10 more.
Where is base.py in the architecture?
base.py is located at libs/langchain/langchain_classic/chains/retrieval_qa/base.py (domain: CoreAbstractions, subdomain: RunnableInterface, directory: libs/langchain/langchain_classic/chains/retrieval_qa).

Analyze Your Own Codebase

Get architecture documentation, dependency graphs, and domain analysis for your codebase in minutes.

Try Supermodel Free