Introduction

This document describes how to develop langchain-core on Kunpeng servers, including source code build, installation, and development verification.

LangChain uses modular abstraction and LangChain Expression Language (LCEL) to encapsulate model calling, data retrieval, tool execution, and memory management into standardized, composable components. This provides developers with a full-process standardized solution from prototype verification to production deployment. When LangChain is deployed on a Kunpeng server, the BiSheng compiler, KML math library, and Hyper MPI high-performance communication library in HPCKit can be used to perform full-link collaborative optimization on computational graphs and operators.

The verification objective is to ensure that LangChain can complete basic installation, import, and minimum running links on the Arm platform. Complex scenarios such as vector databases, RAG, Agent, external model services, and third-party tool invoking are not covered.

Verification Scope

**Table 1** Component scope
Component	Description	Mandatory for Verification
LangChain	Main package of LangChain. Verify that the main entry can be installed and imported.	Mandatory
langchain-core	Core abstraction and runtime. Verify basic capabilities such as Runnable and Prompt.	Mandatory
langchain-text-splitters	Text segmentation component. Verify basic text processing capabilities.	Recommended

**Table 2** Components not included in the verification scope
Component/Scenario	Reason
Vector database	Native dependencies and server deployment will be introduced, which is beyond the scope of basic compatibility verification.
RAG	It depends on external components such as the vector library, Embedding, and document parsing.
Agent	It depends on model services and tool calling, and involves many variables.
langchain-community	It involves a large number of third-party integrations and is suitable for extended verification, not the minimum verification.
External LLM API	It depends on the stability of the network, keys, and model services, and is not suitable as a prerequisite for basic verification.

Parent topic: Developer Guide