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AI Agent 面试题日报(Day4)- AI Agent 实战应用:LangGraph · RAG 架构 · 本地 音乐

AI Agent 面试题日报(Day4)- AI Agent 实战应用:LangGraph · RAG 架构 · 本地 音乐

今日聚焦三大实战主题,结合真实技术栈(LangGraph + Qdrant + Apple Silicon),助你掌握工业级 Agent 开发要点。


题目一

🔧 如何用 LangGraph 构建一个带 RAG 的 Agent 系统?


答案要点

1. 核心架构

用户输入 → Embedding → Qdrant 向量检索 → LangGraph 编排 → LLM 生成

2. 技术栈选型

组件
选型
说明
Embedding
BAAI/bge-large-zh-v1.5
中文最强开源,1024 维
向量库
Qdrant (Docker)
本地部署,支持 GPU 加速
LLM
qwen3.5:35b (Ollama)
本地运行,无需 API Key
编排
LangGraph
状态机管理 Agent 流程

3. 核心代码结构

from langgraph.graph import StateGraph, START, ENDfrom typing import TypedDictclass AgentState(TypedDict):    question: str      # 用户问题    docs: list[str]    # 检索到的文档    answer: str        # 最终答案    steps: list[str]   # 执行步骤def retrieve(state: AgentState) -> AgentState:    """向量检索节点"""    from qdrant_client import QdrantClient    qdrant = QdrantClient(host="localhost", port=6333)    results = qdrant.query_points(        collection_name="knowledge_base",        query=embed(state["question"]),  # BGE 嵌入        limit=3,        with_payload=True    ).points    docs = [hit.payload["content"for hit in results]    return {"docs": docs, "steps": state["steps"] + ["retrieve"]}def generate(state: AgentState) -> AgentState:    """LLM 生成节点"""    prompt = f"问题:{state['question']}\n\n参考资料:\n" + "\n\n".join(state["docs"])    response = llm.invoke(prompt)    return {"answer": response.content, "steps": state["steps"] + ["generate"]}# 构建图graph = StateGraph(AgentState)graph.add_node("retrieve", retrieve)graph.add_node("generate", generate)graph.add_edge(START, "retrieve")graph.add_edge("retrieve""generate")graph.add_edge("generate", END)app = graph.compile()

4. 关键踩坑记录

原因
解决方案
Python 3.9 不支持
模板要求 >= 3.10
用 ~/.hermes-venv/bin/python3.11
Qdrant 版本不匹配
client 1.16.1 vs server 1.18.0
加 check_compatibility=False
向量维度错误
旧 collection 维度不一致
删掉重建:curl -X DELETE .../collections/knowledge_base
无输出
Python stdout 全缓冲
加 PYTHONUNBUFFERED=1

题目二

🎵 如何在 Apple Silicon Mac 上构建本地 AI 音乐生成 Pipeline?


答案要点

1. 方案对比

方案
歌词
人声
成本
适用场景
MusicGen
免费
纯音乐、背景音
Suno
$10/月
完整歌曲
HeartMuLa
免费
本地(需 CUDA)

2. 本地 MusicGen 实战

from audiocraft.models import MusicGen# 模型选择(内存占用)# small ~2GB | medium ~4GB | large ~8GBmodel = MusicGen.get_pretrained('facebook/musicgen-medium')model.set_generation_params(duration=30)  # 最长 30 秒# 生成纯音乐wav = model.generate(["romantic piano ballad, soft and dreamy"])3. 完整混音 Pipeline(Edge-TTS + MusicGen + FFmpeg)Edge-TTS (人声) → MusicGen Small (伴奏) → FFmpeg (混音) → MP3 成品# Step 1: Edge-TTS 生成中文人声(无需下载模型)import edge_ttscommunicate = edge_tts.Communicate("你好,这是一段测试语音""zh-CN-XiaoxiaoNeural")await communicate.save("vocal.mp3")# Step 2: MusicGen 生成伴奏wav = model.generate(["romantic piano ballad"])torchaudio.save("background.wav", wav[0].cpu(), sample_rate=32000)# Step 3: FFmpeg 混音# ffmpeg -y -i background.wav -i vocal.wav \#   -filter_complex '[0:a]volume=0.3[bg]; [1:a]volume=1.0[vo]; [bg][vo]amix' final.mp3

4. 关键技术细节

  • FFmpeg 音量参数:volume=0.3 表示 30% 音量,不是分贝值
  • MusicGen 限制:每次最多 30 秒,需要拼接
  • 国内下载:用清华镜像 + hf-mirror.com,删 .incomplete 后重试

题目三

📋 如何设计一个支持多 Agent 协作的系统?结合 LangGraph 状态机实现


答案要点

1. 多 Agent 协作架构

用户  ↓┌─────────────────────────────┐│     Orchestrator Agent       │ ← 中央调度│  (意图识别 + 任务分发)       │└──────────┬──────────────────┘           ↓    ┌──────┼──────┬──────┐    ↓      ↓      ↓      ↓ 检索  写代码  画图  音乐  ... ← 专业 Agent    ↓      ↓      ↓      ↓    └──────┴──────┴──────┘           ↓    ┌─────────────────┐    │  结果整合 Agent  │ ← 汇总输出    └─────────────────┘

2. LangGraph 条件分支实现

class MultiAgentState(TypedDict):    task: str    intent: str           # 识别到的意图    sub_results: dict     # 各 Agent 返回结果    final_answer: strdef triage(state: MultiAgentState) -> MultiAgentState:    """意图识别 + 路由"""    intent = llm.invoke(f"判断任务类型:{state['task']}")    return {"intent": intent, "steps": state["steps"] + ["triage"]}def route_by_intent(state: MultiAgentState) -> str:    """条件路由"""    intent = state["intent"].lower()    if "代码" in intent or "code" in intent:        return "code_agent"    elif "画" in intent or "图" in intent:        return "image_agent"    elif "音乐" in intent or "歌" in intent:        return "music_agent"    else:        return "search_agent"# 构建条件图graph = StateGraph(MultiAgentState)graph.add_node("triage", triage)graph.add_node("code_agent", code_agent)graph.add_node("image_agent", image_agent)graph.add_node("music_agent", music_agent)graph.add_node("search_agent", search_agent)graph.add_node("synthesize", synthesize)graph.add_edge(START, "triage")graph.add_conditional_edges("triage", route_by_intent)# ... 各 Agent 汇合到 synthesize

3. 思考维度

维度
考量
通信协议
Agent 间如何传递信息?共享状态 vs 消息队列
错误处理
单个 Agent 失败时如何回退或重试
资源控制
并发数限制、API 调用频率控制
可观测性
如何追踪整个协作流程?LangGraph 支持查看执行历史
扩展性
新增 Agent 类型如何不影响现有架构
基本 文件 流程 错误 SQL 调试
  1. 请求信息 : 2026-06-12 14:09:20 HTTP/1.1 GET : https://www.yeyulingfeng.com/a/742140.html
  2. 运行时间 : 0.187970s [ 吞吐率:5.32req/s ] 内存消耗:4,697.28kb 文件加载:145
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=ced4180b725d51b5d652fbae47fc15c1
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  1. CONNECT:[ UseTime:0.000891s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000747s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000297s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000268s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000491s ]
  6. SELECT * FROM `set` [ RunTime:0.000208s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000572s ]
  8. SELECT * FROM `article` WHERE `id` = 742140 LIMIT 1 [ RunTime:0.000509s ]
  9. UPDATE `article` SET `lasttime` = 1781244560 WHERE `id` = 742140 [ RunTime:0.002527s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000219s ]
  11. SELECT * FROM `article` WHERE `id` < 742140 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000419s ]
  12. SELECT * FROM `article` WHERE `id` > 742140 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000357s ]
  13. SELECT * FROM `article` WHERE `id` < 742140 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000971s ]
  14. SELECT * FROM `article` WHERE `id` < 742140 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000686s ]
  15. SELECT * FROM `article` WHERE `id` < 742140 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000795s ]
0.191914s