类 StateGraph<SD, S, U, N, I, O, C>

一个图，其节点通过读取和写入共享状态进行通信。每个节点接受一个定义的 State 作为输入，并返回一个 Partial<State>。

每个状态键可以选择使用一个 reducer 函数进行注解，该函数用于聚合从多个节点接收到的该键的值。reducer 函数的签名是 (left: Value, right: UpdateValue) => Value。

有关定义状态的更多信息，请参见 Annotation。

在向图中添加节点和边之后，必须调用 .compile() 才能使用它。

示例

import {
  type BaseMessage,
  AIMessage,
  HumanMessage,
} from "@langchain/core/messages";
import { StateGraph, Annotation } from "@langchain/langgraph";

// Define a state with a single key named "messages" that will
// combine a returned BaseMessage or arrays of BaseMessages
const StateAnnotation = Annotation.Root({
  sentiment: Annotation<string>,
  messages: Annotation<BaseMessage[]>({
    reducer: (left: BaseMessage[], right: BaseMessage | BaseMessage[]) => {
      if (Array.isArray(right)) {
        return left.concat(right);
      }
      return left.concat([right]);
    },
    default: () => [],
  }),
});

const graphBuilder = new StateGraph(StateAnnotation);

// A node in the graph that returns an object with a "messages" key
// will update the state by combining the existing value with the returned one.
const myNode = (state: typeof StateAnnotation.State) => {
  return {
    messages: [new AIMessage("Some new response")],
    sentiment: "positive",
  };
};

const graph = graphBuilder
  .addNode("myNode", myNode)
  .addEdge("__start__", "myNode")
  .addEdge("myNode", "__end__")
  .compile();

await graph.invoke({ messages: [new HumanMessage("how are you?")] });

// {
//   messages: [HumanMessage("how are you?"), AIMessage("Some new response")],
//   sentiment: "positive",
// }

类型参数

继承关系 (查看完整)

  • Graph<N, S, U, StateGraphNodeSpec<S, U>, ToStateDefinition<C>>
    • StateGraph

构造函数

constructor

属性

branches channels compiled edges entryPoint? nodes waitingEdges

访问器

allEdges

方法

_addSchema addConditionalEdges addEdge addNode compile setEntryPoint setFinishPoint validate warnIfCompiled

构造函数

constructor

属性

branches

branches: Record<string, Record<string, Branch<S, N, any>>>

channels

channels: Record<string, BaseChannel<unknown, unknown, unknown> | ManagedValueSpec>

compiled

compiled: boolean

edges

edges: Set<["__start__" | N, "__end__" | N]>

可选 entryPoint

entryPoint?: string

nodes

nodes: Record<N, StateGraphNodeSpec<S, U>>

waitingEdges

waitingEdges: Set<[N[], N]>

访问器

allEdges

  • get allEdges(): Set<[string, string]>

  • 返回 Set<[string, string]>

方法

_addSchema

  • _addSchema(stateDefinition): void

  • 参数

    • stateDefinition: SDZod

    返回 void

addConditionalEdges

addEdge

  • addEdge(startKey, endKey): this

  • 参数

    • startKey: "__start__" | N | N[]
    • endKey: "__end__" | N

    返回 this

addNode

compile

  • compile(__namedParameters?): CompiledStateGraph<S, U, N, I, O, C>

  • 参数

    • 可选 __namedParameters: {
          可选 checkpointer?: false | BaseCheckpointSaver<number>;
          可选 interruptAfter?: "*" | N[];
          可选 interruptBefore?: "*" | N[];
          可选 name?: string;
          可选 store?: BaseStore;
      }
      • 可选 checkpointer?: false | BaseCheckpointSaver<number>
      • 可选 interruptAfter?: "*" | N[]
      • 可选 interruptBefore?: "*" | N[]
      • 可选 name?: string
      • 可选 store?: BaseStore

    返回 CompiledStateGraph<S, U, N, I, O, C>

setEntryPoint

  • setEntryPoint(key): this

  • 参数

    • key: N

    返回 this

    已弃用

    请改用 addEdge(START, key)。

setFinishPoint

  • setFinishPoint(key): this

  • 参数

    • key: N

    返回 this

    已弃用

    请改用 addEdge(key, END)。

validate

  • validate(interrupt?): void

  • 参数

    • 可选 interrupt: string[]

    返回 void

受保护的 warnIfCompiled

  • warnIfCompiled(message): void

  • 参数

    • message: string

    返回 void

设置

成员可见性

主题

在此页面上

constructorbrancheschannelscompilededgesentryPointnodeswaitingEdgesallEdges_addSchemaaddConditionalEdgesaddEdgeaddNodecompilesetEntryPointsetFinishPointvalidatewarnIfCompiled