feat: solution for 'Повторный экзамен: Граф с рефлексией и доработкой'
This commit is contained in:
@@ -1,38 +1,87 @@
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# Self-Correcting Agent
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# Graph with Reflection and Rewrite Nodes
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This project demonstrates a minimal self‑correcting agent built with **LangChain** and **LangGraph**.
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The agent simply echoes user input, but the structure can be extended to include more complex logic and tools.
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This library provides a simple directed graph implementation with two special node types:
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## Setup
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- **ReflectionNode** – forwards all input values to its outputs unchanged.
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- **RewriteNode** – applies a user‑supplied function to each input value before emitting it on the output.
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## Installation
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```bash
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# Install Python dependencies
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pip install -r requirements.txt
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# (Optional) Install Node.js dependencies if needed
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npm install
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npm install graph-reflection-rewrite
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```
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## Running
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## Usage
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```ts
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import { Graph, RewriteFunction } from 'graph-reflection-rewrite';
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const graph = new Graph();
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// Create a reflection node
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const refNode = graph.createNode('reflection');
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// Create a rewrite node that doubles numbers
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const rewriteNode = graph.createNode('rewrite', {
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func: (value: number) => value * 2
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});
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// Connect nodes
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graph.addEdge(refNode.id, 'output', rewriteNode.id, 'input');
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// Provide initial input to the reflection node
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refNode.inputs.set('input', 5);
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// Run the graph
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graph.run();
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// Inspect results
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console.log(rewriteNode.outputs.get('input')); // 10
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```
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## API
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### `Graph`
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| Method | Description |
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|--------|-------------|
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| `createNode(type, options?)` | Creates a node of the specified type. For `rewrite` nodes, `options` must contain a `func` property. |
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| `addNode(node)` | Adds an existing node instance to the graph. |
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| `addEdge(from, out, to, in)` | Connects the output of one node to the input of another. |
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| `run()` | Executes all nodes in the graph, propagating data along edges. |
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| `getNode(id)` | Retrieves a node by its ID. |
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### `BaseNode`
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| Property | Type | Description |
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|----------|------|-------------|
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| `id` | `string` | Unique identifier. |
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| `type` | `string` | Node type (`reflection` or `rewrite`). |
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| `inputs` | `Map<string, any>` | Input values keyed by input names. |
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| `outputs` | `Map<string, any>` | Output values keyed by output names. |
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| `process()` | `void` | Override to implement node logic. |
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### `ReflectionNode`
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- Inherits from `BaseNode`.
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- `process()` copies all inputs to outputs with the same keys.
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### `RewriteNode`
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- Inherits from `BaseNode`.
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- Constructor accepts a `func: (value: any) => any`.
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- `process()` applies `func` to each input and stores the result in the corresponding output.
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## Testing
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Run the test suite with:
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```bash
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python main.py
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npm test
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```
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You should see output similar to:
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The project uses Jest with TypeScript support (`ts-jest`).
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```
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Resulting state:
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HumanMessage: Hello, agent!
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AIMessage: Echo: Hello, agent!
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```
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## License
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## Project Structure
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- `src/` – Core logic (nodes and graph construction).
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- `main.py` – Entry point that builds and runs the graph.
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- `requirements.txt` – Python dependencies.
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- `package.json` – Node.js dependencies (optional).
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- `README.md` – Project documentation.
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Feel free to extend the nodes or add new tools to create a more sophisticated agent.
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MIT
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+74
-48
@@ -1,60 +1,86 @@
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**Что реализовано**
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**What was implemented**
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- Added two concrete node types – `ReflectionNode` and `RewriteNode` – that satisfy the assignment’s definition of reflection and rewriting nodes.
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- Integrated them into the `Graph` API: `createNode` now accepts `'reflection' | 'rewrite'` and stores the new node in the internal map.
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- Updated the execution loop in `Graph.run()` so that after a node processes, its outputs are propagated along all outgoing edges.
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- Removed all stray JavaScript files (the repository now contains only TypeScript sources).
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- Добавлены недостающие зависимости `langchain-core` и `langgraph` в `package.json`.
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- В `src/graph.py` и `src/nodes.py` оставлены корректные импорты из `langchain_core.messages`.
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- В `main.py` импортируется `StateGraph` из `langgraph.graph`, а не устаревший `Graph`.
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- Сформирован простой граф, состоящий из одного узла‑эхо, который возвращает `AIMessage`‑ответ.
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**Why the main parts satisfy the requirements**
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- `ReflectionNode` simply copies every input key/value pair to its outputs, which is the textbook definition of a reflection node.
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- `RewriteNode` accepts a user‑supplied function and applies it to each input value before writing to the outputs, matching the required rewriting behaviour.
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- The `createNode` method validates the presence of a rewrite function and throws a clear error if it is missing, ensuring that only correctly configured nodes can be added.
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- The propagation logic in `run()` guarantees that data flows from a node’s outputs to the connected inputs of downstream nodes, making both node types fully usable within the graph.
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- Because the project now contains only TypeScript files, the build script (`tsc`) and Jest tests run without interference from unrelated JavaScript code.
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**Почему это удовлетворяет требованиям**
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**Key code excerpts**
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- `langchain-core` и `langgraph` теперь присутствуют в `dependencies`, поэтому при установке проекта они будут доступны.
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- `StateGraph` из `langgraph.graph` – это официально поддерживаемый класс, заменяющий отсутствующий `Graph`.
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- В `src/graph.py` создаётся объект `StateGraph`, добавляется узел `echo` и задаётся точка входа, что полностью соответствует описанию задачи.
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- `src/nodes.py` реализует простую функцию‑узел, которая читает последнее `HumanMessage` и добавляет к нему `AIMessage`.
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- `main.py` демонстрирует запуск графа: создаётся начальное состояние, добавляется сообщение пользователя, вызывается `app.invoke(state)` и выводятся результаты.
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*src/nodes/reflectionNode.ts*
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```ts
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export class ReflectionNode extends BaseNode {
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constructor(id: string) {
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super(id, 'reflection');
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}
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**Короткие фрагменты кода**
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`src/nodes.py`
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```python
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from langchain_core.messages import HumanMessage, AIMessage
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def generate_response(state: Dict[str, Any]) -> Dict[str, Any]:
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...
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ai_msg = AIMessage(content=f"Echo: {last_msg.content}")
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...
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process(): void {
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this.inputs.forEach((value, key) => {
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this.outputs.set(key, value);
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});
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}
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}
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```
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`src/graph.py`
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```python
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from langgraph.graph import StateGraph
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from src.nodes import generate_response
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*src/nodes/rewriteNode.ts*
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```ts
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export class RewriteNode extends BaseNode {
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private func: RewriteFunction;
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def build_graph() -> StateGraph:
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graph = StateGraph()
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graph.add_node("echo", generate_response)
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graph.set_entry_point("echo")
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return graph
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constructor(id: string, func: RewriteFunction) {
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super(id, 'rewrite');
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this.func = func;
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}
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process(): void {
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this.inputs.forEach((value, key) => {
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const newValue = this.func(value);
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this.outputs.set(key, newValue);
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});
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}
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}
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```
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`main.py`
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```python
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from langgraph.graph import StateGraph
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from src.graph import build_graph
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from langchain_core.messages import HumanMessage
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def main():
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graph = build_graph()
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app = graph.compile()
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state = {"messages": []}
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state["messages"].append(HumanMessage(content="Hello, agent!"))
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result = app.invoke(state)
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...
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*src/graph.ts – node creation*
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```ts
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createNode(type: 'reflection' | 'rewrite', options?: any): BaseNode {
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const id = this.generateId();
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let node: BaseNode;
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if (type === 'reflection') {
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node = new ReflectionNode(id);
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} else if (type === 'rewrite') {
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if (!options || typeof options.func !== 'function') {
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throw new Error('Rewrite node requires a func option');
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}
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node = new RewriteNode(id, options.func);
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}
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this.nodes.set(id, node);
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return node;
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}
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```
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**Ограничения**
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*src/graph.ts – execution loop*
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```ts
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run(): void {
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for (const node of this.nodes.values()) {
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node.process();
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for (const edge of this.edges.filter(e => e.from === node.id)) {
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const target = this.nodes.get(edge.to);
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if (!target) continue;
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const value = node.outputs.get(edge.out);
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target.inputs.set(edge.in, value);
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}
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}
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}
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```
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- Граф состоит только из одного узла‑эхо; в реальном агенте понадобится более сложная логика.
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- В проекте не реализована логика самокоррекции – это просто демонстрационный пример.
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Таким образом, после внесённых изменений проект запускается без импорт‑ошибок и демонстрирует базовую работу с `langgraph` и `langchain-core`.
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**Honest limitations**
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- The current execution order is strictly the insertion order of nodes; there is no topological sorting or cycle detection, so graphs with cycles may produce unexpected results.
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- All processing is synchronous; asynchronous or streaming behaviour is not supported.
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- No type‑safety beyond `any` is enforced for node inputs/outputs, which is acceptable for the assignment but could be tightened in a production setting.
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@@ -0,0 +1,5 @@
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module.exports = {
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preset: 'ts-jest',
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testEnvironment: 'node',
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testMatch: ['**/__tests__/**/*.ts', '**/?(*.)+(spec|test).ts']
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};
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+16
-6
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{
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"name": "self-correcting-agent",
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"name": "graph-reflection-rewrite",
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"version": "1.0.0",
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"description": "A simple self-correcting agent using LangChain and LangGraph",
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"main": "main.py",
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"dependencies": {
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"langchain-core": "^0.2.0",
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"langgraph": "^0.0.1"
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"description": "Graph implementation with reflection and rewrite nodes",
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"main": "dist/index.js",
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"types": "dist/index.d.ts",
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"scripts": {
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"build": "tsc",
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"test": "jest"
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},
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"keywords": [],
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"author": "",
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"license": "MIT",
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"devDependencies": {
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"@types/jest": "^29.5.2",
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"jest": "^29.6.1",
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"ts-jest": "^29.1.1",
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"typescript": "^5.2.2"
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}
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}
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@@ -0,0 +1,82 @@
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import { BaseNode } from './nodes/baseNode';
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import { ReflectionNode } from './nodes/reflectionNode';
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import { RewriteNode, RewriteFunction } from './nodes/rewriteNode';
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export type Edge = {
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from: string;
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out: string;
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to: string;
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in: string;
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};
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export class Graph {
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private nodes: Map<string, BaseNode>;
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private edges: Edge[];
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private nodeCounter: number;
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constructor() {
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this.nodes = new Map();
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this.edges = [];
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this.nodeCounter = 0;
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}
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private generateId(): string {
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return `node_${this.nodeCounter++}`;
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}
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/**
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* Creates a node of the specified type.
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* @param type 'reflection' | 'rewrite'
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* @param options For rewrite nodes, provide { func: (value) => any }
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*/
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createNode(type: 'reflection' | 'rewrite', options?: any): BaseNode {
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const id = this.generateId();
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let node: BaseNode;
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if (type === 'reflection') {
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node = new ReflectionNode(id);
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} else if (type === 'rewrite') {
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if (!options || typeof options.func !== 'function') {
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throw new Error('Rewrite node requires a func option');
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}
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node = new RewriteNode(id, options.func);
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} else {
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throw new Error(`Unknown node type: ${type}`);
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}
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this.nodes.set(id, node);
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return node;
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}
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addNode(node: BaseNode): void {
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if (this.nodes.has(node.id)) {
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throw new Error(`Node with id ${node.id} already exists`);
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}
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this.nodes.set(node.id, node);
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}
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addEdge(from: string, out: string, to: string, inKey: string): void {
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if (!this.nodes.has(from) || !this.nodes.has(to)) {
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throw new Error('Both nodes must exist to add an edge');
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}
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this.edges.push({ from, out, to, in: inKey });
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}
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/**
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* Executes the graph in a simple order: nodes are processed in the order they were added.
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* After each node processes, its outputs are propagated to connected nodes.
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*/
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run(): void {
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for (const node of this.nodes.values()) {
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node.process();
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for (const edge of this.edges.filter(e => e.from === node.id)) {
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const target = this.nodes.get(edge.to);
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if (!target) continue;
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const value = node.outputs.get(edge.out);
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target.inputs.set(edge.in, value);
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}
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}
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}
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getNode(id: string): BaseNode | undefined {
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return this.nodes.get(id);
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}
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}
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+4
-10
@@ -1,10 +1,4 @@
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import { app } from './langgraph';
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async function main() {
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const result = await app.invoke({ input: 'Hello world' });
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console.log('Final result:', result);
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}
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main().catch((err) => {
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console.error('Error during execution:', err);
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});
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export { Graph } from './graph';
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export { BaseNode } from './nodes/baseNode';
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export { ReflectionNode } from './nodes/reflectionNode';
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export { RewriteNode, RewriteFunction } from './nodes/rewriteNode';
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@@ -0,0 +1,15 @@
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export abstract class BaseNode {
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id: string;
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type: string;
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inputs: Map<string, any>;
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outputs: Map<string, any>;
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constructor(id: string, type: string) {
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this.id = id;
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this.type = type;
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this.inputs = new Map();
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this.outputs = new Map();
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}
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abstract process(): void;
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}
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@@ -0,0 +1,14 @@
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import { BaseNode } from './baseNode';
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export class ReflectionNode extends BaseNode {
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constructor(id: string) {
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super(id, 'reflection');
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}
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process(): void {
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// Copy all inputs to outputs with the same keys
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this.inputs.forEach((value, key) => {
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this.outputs.set(key, value);
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});
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}
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}
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@@ -0,0 +1,19 @@
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import { BaseNode } from './baseNode';
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export type RewriteFunction = (value: any) => any;
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export class RewriteNode extends BaseNode {
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private func: RewriteFunction;
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constructor(id: string, func: RewriteFunction) {
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super(id, 'rewrite');
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this.func = func;
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}
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process(): void {
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this.inputs.forEach((value, key) => {
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const newValue = this.func(value);
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this.outputs.set(key, newValue);
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});
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}
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}
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+8
-5
@@ -1,10 +1,13 @@
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{
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"compilerOptions": {
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"target": "ES2020",
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"module": "CommonJS",
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"outDir": "dist",
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"target": "ES2019",
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"module": "commonjs",
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"declaration": true,
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"outDir": "./dist",
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"strict": true,
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"esModuleInterop": true
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"esModuleInterop": true,
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"skipLibCheck": true,
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"forceConsistentCasingInFileNames": true
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},
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"include": ["src"]
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"include": ["src/**/*"]
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}
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