6.4 FastAPI和Flask的区别和联系(扩展资料) 2.html 41 KB

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  218. <span class="md-ellipsis">
  219. 3.3 基于Mysql数据库实现问答系统
  220. </span>
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  222. </li>
  223. <li class="md-nav__item">
  224. <a href="../%E2%91%A2%20%E5%9F%BA%E4%BA%8EMysql%E5%BA%93%E7%9A%84%E9%97%AE%E7%AD%94%E7%B3%BB%E7%BB%9F/3.4%20BM25%E7%AE%97%E6%B3%95%E7%AE%80%E4%BB%8B%E4%B8%8E%E5%BA%94%E7%94%A8.html" class="md-nav__link">
  225. <span class="md-ellipsis">
  226. 3.4 BM25算法简介与应用
  227. </span>
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  229. </li>
  230. </ul>
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  233. <li class="md-nav__item md-nav__item--nested">
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  235. <label class="md-nav__link" for="__nav_5" id="__nav_5_label" tabindex="0">
  236. <span class="md-ellipsis">
  237. ④ 基于Milvus库的问答系统
  238. </span>
  239. <span class="md-nav__icon md-icon"></span>
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  241. <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_5_label" aria-expanded="false">
  242. <label class="md-nav__title" for="__nav_5">
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  244. ④ 基于Milvus库的问答系统
  245. </label>
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  249. <span class="md-ellipsis">
  250. 4.1 整体架构与工程流程
  251. </span>
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  253. </li>
  254. <li class="md-nav__item">
  255. <a href="../%E2%91%A3%20%E5%9F%BA%E4%BA%8EMilvus%E5%BA%93%E7%9A%84%E9%97%AE%E7%AD%94%E7%B3%BB%E7%BB%9F/4.2%20%E5%9F%BA%E7%A1%80%E6%A8%A1%E5%9D%97.html" class="md-nav__link">
  256. <span class="md-ellipsis">
  257. 4.2 基础模块
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  262. <a href="../%E2%91%A3%20%E5%9F%BA%E4%BA%8EMilvus%E5%BA%93%E7%9A%84%E9%97%AE%E7%AD%94%E7%B3%BB%E7%BB%9F/4.3%20%E6%96%87%E6%A1%A3%E5%A4%84%E7%90%86%E6%A8%A1%E5%9D%97.html" class="md-nav__link">
  263. <span class="md-ellipsis">
  264. 4.3 文档处理模块
  265. </span>
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  269. <a href="../%E2%91%A3%20%E5%9F%BA%E4%BA%8EMilvus%E5%BA%93%E7%9A%84%E9%97%AE%E7%AD%94%E7%B3%BB%E7%BB%9F/4.4%20%E5%90%91%E9%87%8F%E5%AD%98%E5%82%A8.html" class="md-nav__link">
  270. <span class="md-ellipsis">
  271. 4.4 向量存储
  272. </span>
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  276. <a href="../%E2%91%A3%20%E5%9F%BA%E4%BA%8EMilvus%E5%BA%93%E7%9A%84%E9%97%AE%E7%AD%94%E7%B3%BB%E7%BB%9F/4.5%20prompts%E8%AE%BE%E8%AE%A1%E4%B8%8Equery%E6%84%8F%E5%9B%BE%E8%AF%86%E5%88%AB.html" class="md-nav__link">
  277. <span class="md-ellipsis">
  278. 4.5 prompts设计与query意图识别
  279. </span>
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  284. <span class="md-ellipsis">
  285. 4.6 检索策略与RAG系统设计
  286. </span>
  287. </a>
  288. </li>
  289. <li class="md-nav__item">
  290. <a href="../%E2%91%A3%20%E5%9F%BA%E4%BA%8EMilvus%E5%BA%93%E7%9A%84%E9%97%AE%E7%AD%94%E7%B3%BB%E7%BB%9F/4.7%20RAG%E7%B3%BB%E7%BB%9F%E8%BF%90%E8%A1%8C.html" class="md-nav__link">
  291. <span class="md-ellipsis">
  292. 4.7 RAG系统运行
  293. </span>
  294. </a>
  295. </li>
  296. <li class="md-nav__item">
  297. <a href="../%E2%91%A3%20%E5%9F%BA%E4%BA%8EMilvus%E5%BA%93%E7%9A%84%E9%97%AE%E7%AD%94%E7%B3%BB%E7%BB%9F/4.8%20%E6%96%87%E6%A1%A3%E8%A7%A3%E6%9E%90%E5%B7%A5%E5%85%B7%28%E6%89%A9%E5%B1%95%E8%B5%84%E6%96%99%29.html" class="md-nav__link">
  298. <span class="md-ellipsis">
  299. 4.8 文档解析工具(扩展资料)
  300. </span>
  301. </a>
  302. </li>
  303. <li class="md-nav__item">
  304. <a href="../%E2%91%A3%20%E5%9F%BA%E4%BA%8EMilvus%E5%BA%93%E7%9A%84%E9%97%AE%E7%AD%94%E7%B3%BB%E7%BB%9F/4.9%20RAG%E4%B8%AD%E7%9A%84Query%E6%94%B9%E5%86%99%28%E6%89%A9%E5%B1%95%E8%B5%84%E6%96%99%29.html" class="md-nav__link">
  305. <span class="md-ellipsis">
  306. 4.9 RAG中的Query改写(扩展资料)
  307. </span>
  308. </a>
  309. </li>
  310. <li class="md-nav__item">
  311. <a href="../%E2%91%A3%20%E5%9F%BA%E4%BA%8EMilvus%E5%BA%93%E7%9A%84%E9%97%AE%E7%AD%94%E7%B3%BB%E7%BB%9F/%E6%95%B0%E6%8D%AE%E9%9B%86%E7%94%9F%E6%88%90%E4%B8%8E%E4%BC%98%E5%8C%96%28%E6%89%A9%E5%B1%95%E8%B5%84%E6%96%99%29.html" class="md-nav__link">
  312. <span class="md-ellipsis">
  313. 数据集生成与优化(扩展资料)
  314. </span>
  315. </a>
  316. </li>
  317. </ul>
  318. </nav>
  319. </li>
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  322. <label class="md-nav__link" for="__nav_6" id="__nav_6_label" tabindex="0">
  323. <span class="md-ellipsis">
  324. ⑤ RAG系统评估
  325. </span>
  326. <span class="md-nav__icon md-icon"></span>
  327. </label>
  328. <nav class="md-nav" data-md-level="1" aria-labelledby="__nav_6_label" aria-expanded="false">
  329. <label class="md-nav__title" for="__nav_6">
  330. <span class="md-nav__icon md-icon"></span>
  331. ⑤ RAG系统评估
  332. </label>
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  334. <li class="md-nav__item">
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  336. <span class="md-ellipsis">
  337. 5.1 RAG系统评估工具
  338. </span>
  339. </a>
  340. </li>
  341. <li class="md-nav__item">
  342. <a href="../%E2%91%A4%20RAG%E7%B3%BB%E7%BB%9F%E8%AF%84%E4%BC%B0/5.2%20%E5%AE%9E%E7%8E%B0EnterpriseKB-RAG%E7%B3%BB%E7%BB%9F%E7%9A%84%E8%AF%84%E4%BC%B0.html" class="md-nav__link">
  343. <span class="md-ellipsis">
  344. 5.2 实现企业知识库RAG系统的评估
  345. </span>
  346. </a>
  347. </li>
  348. <li class="md-nav__item">
  349. <a href="../%E2%91%A4%20RAG%E7%B3%BB%E7%BB%9F%E8%AF%84%E4%BC%B0/5.3%20RAG%E8%AF%84%E4%BC%B0%E6%95%B0%E6%8D%AE%E9%9B%86%E7%9A%84%E6%9E%84%E9%80%A0%28%E6%89%A9%E5%B1%95%29.html" class="md-nav__link">
  350. <span class="md-ellipsis">
  351. 5.3 RAG评估数据集的构造(扩展)
  352. </span>
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  362. ⑥ 融合Mysql的RAG系统
  363. </span>
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  365. </label>
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  369. ⑥ 融合Mysql的RAG系统
  370. </label>
  371. <ul class="md-nav__list" data-md-scrollfix>
  372. <li class="md-nav__item">
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  374. <span class="md-ellipsis">
  375. 6.1 融合FQA和知识库查询
  376. </span>
  377. </a>
  378. </li>
  379. <li class="md-nav__item">
  380. <a href="6.2%20%E8%9E%8D%E5%90%88FAQ%20%E5%92%8C%E7%9F%A5%E8%AF%86%E5%BA%93%E6%9F%A5%E8%AF%A2%EF%BC%88%E4%BC%98%E5%8C%96%E7%89%88%EF%BC%89.html" class="md-nav__link">
  381. <span class="md-ellipsis">
  382. 6.2 融合FAQ 和知识库查询(优化版)
  383. </span>
  384. </a>
  385. </li>
  386. <li class="md-nav__item">
  387. <a href="6.3%20%E5%9F%BA%E4%BA%8E%20FastAPI%20%E7%9A%84%20FAQ%20%E4%B8%8E%E7%9F%A5%E8%AF%86%E5%BA%93%E6%9F%A5%E8%AF%A2%E6%8E%A5%E5%8F%A3.html" class="md-nav__link">
  388. <span class="md-ellipsis">
  389. 6.3 基于 FastAPI 的 FAQ 与知识库查询接口
  390. </span>
  391. </a>
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  395. <label class="md-nav__link md-nav__link--active" for="__toc">
  396. <span class="md-ellipsis">
  397. 6.4 FastAPI和Flask的区别和联系(扩展资料)
  398. </span>
  399. <span class="md-nav__icon md-icon"></span>
  400. </label>
  401. <a href="6.4%20FastAPI%E5%92%8CFlask%E7%9A%84%E5%8C%BA%E5%88%AB%E5%92%8C%E8%81%94%E7%B3%BB%28%E6%89%A9%E5%B1%95%E8%B5%84%E6%96%99%29.html" class="md-nav__link md-nav__link--active">
  402. <span class="md-ellipsis">
  403. 6.4 FastAPI和Flask的区别和联系(扩展资料)
  404. </span>
  405. </a>
  406. <nav class="md-nav md-nav--secondary" aria-label="目录">
  407. <label class="md-nav__title" for="__toc">
  408. <span class="md-nav__icon md-icon"></span>
  409. 目录
  410. </label>
  411. <ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
  412. <li class="md-nav__item">
  413. <a href="#fastapiflask" class="md-nav__link">
  414. <span class="md-ellipsis">
  415. 一、FastAPI和Flask的区别和联系
  416. </span>
  417. </a>
  418. </li>
  419. <li class="md-nav__item">
  420. <a href="#fastapiflask_1" class="md-nav__link">
  421. <span class="md-ellipsis">
  422. 二、FastAPI和Flask示例
  423. </span>
  424. </a>
  425. </li>
  426. <li class="md-nav__item">
  427. <a href="#llm" class="md-nav__link">
  428. <span class="md-ellipsis">
  429. 三、在利用大模型(LLM)部署时怎么选择?
  430. </span>
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  442. <span class="md-ellipsis">
  443. ⑦ 企业级生产环境部署
  444. </span>
  445. <span class="md-nav__icon md-icon"></span>
  446. </label>
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  450. ⑦ 企业级生产环境部署
  451. </label>
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  455. <span class="md-ellipsis">
  456. 7.1 Docker的原理和基本使用
  457. </span>
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  462. <span class="md-ellipsis">
  463. 7.2 服务部署
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  480. <span class="md-nav__icon md-icon"></span>
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  484. <li class="md-nav__item">
  485. <a href="#fastapiflask" class="md-nav__link">
  486. <span class="md-ellipsis">
  487. 一、FastAPI和Flask的区别和联系
  488. </span>
  489. </a>
  490. </li>
  491. <li class="md-nav__item">
  492. <a href="#fastapiflask_1" class="md-nav__link">
  493. <span class="md-ellipsis">
  494. 二、FastAPI和Flask示例
  495. </span>
  496. </a>
  497. </li>
  498. <li class="md-nav__item">
  499. <a href="#llm" class="md-nav__link">
  500. <span class="md-ellipsis">
  501. 三、在利用大模型(LLM)部署时怎么选择?
  502. </span>
  503. </a>
  504. </li>
  505. </ul>
  506. </nav>
  507. </div>
  508. </div>
  509. </div>
  510. <div class="md-content" data-md-component="content">
  511. <article class="md-content__inner md-typeset">
  512. <h1>6.4 FastAPI和Flask的区别和联系(扩展资料)</h1>
  513. <h2 id="fastapiflask">一、FastAPI和Flask的区别和联系<a class="headerlink" href="#fastapiflask" title="Permanent link">&para;</a></h2>
  514. <table>
  515. <thead>
  516. <tr>
  517. <th><strong>特性</strong></th>
  518. <th><strong>Flask (同步)</strong></th>
  519. <th><strong>FastAPI (异步)</strong></th>
  520. </tr>
  521. </thead>
  522. <tbody>
  523. <tr>
  524. <td><strong>核心机制</strong></td>
  525. <td>同步阻塞 (一步接一步)</td>
  526. <td>异步非阻塞 (利用等待时间处理其他事)</td>
  527. </tr>
  528. <tr>
  529. <td><strong>比喻</strong></td>
  530. <td>单任务厨师</td>
  531. <td>多任务厨师</td>
  532. </tr>
  533. <tr>
  534. <td><strong>代码风格</strong></td>
  535. <td>标准 Python 函数 (<code>def</code>)</td>
  536. <td>使用 <code>async def</code> 和 <code>await</code></td>
  537. </tr>
  538. <tr>
  539. <td><strong>擅长场景</strong></td>
  540. <td>CPU 密集型任务 (需要持续计算)</td>
  541. <td>I/O 密集型任务 (大量等待时间,如网络、磁盘、LLM)</td>
  542. </tr>
  543. <tr>
  544. <td><strong>并发能力</strong></td>
  545. <td>较低 (依赖多进程/多线程)</td>
  546. <td>非常高 (单个进程能处理大量并发连接)</td>
  547. </tr>
  548. <tr>
  549. <td><strong>性能</strong></td>
  550. <td>对于 I/O 密集场景,性能较低</td>
  551. <td>对于 I/O 密集场景,性能非常高</td>
  552. </tr>
  553. <tr>
  554. <td><strong>学习曲线</strong></td>
  555. <td>相对平缓 (同步逻辑易理解)</td>
  556. <td>稍陡峭 (需要理解 async/await 和事件循环)</td>
  557. </tr>
  558. <tr>
  559. <td><strong>数据校验</strong></td>
  560. <td>需额外库 (如 Flask-WTF, Marshmallow)</td>
  561. <td>内置 Pydantic,自动数据校验和文档生成</td>
  562. </tr>
  563. </tbody>
  564. </table>
  565. <p><strong>联系:</strong></p>
  566. <ul>
  567. <li>它们都是 Python Web 框架,用来创建 API 或 Web 应用。</li>
  568. <li>它们都能接收 HTTP 请求,根据 URL 路由到相应的处理函数,然后返回 HTTP 响应。</li>
  569. <li>Flask 也可以通过一些方式(比如使用 <code>gevent</code> 或 <code>asyncio</code> 扩展)实现类似异步的功能,但不是其天生设计。FastAPI 也可以运行同步代码(它会自动在线程池里运行,避免阻塞主循环)。</li>
  570. </ul>
  571. <h2 id="fastapiflask_1">二、FastAPI和Flask示例<a class="headerlink" href="#fastapiflask_1" title="Permanent link">&para;</a></h2>
  572. <p>想象一下你在经营一家餐厅:</p>
  573. <ol>
  574. <li>
  575. <p><strong>Flask 的同步路由 (Synchronous): 就像只有一个厨师,而且他一次只能做一个菜。</strong></p>
  576. </li>
  577. <li>
  578. <p>工作方式:</p>
  579. <ul>
  580. <li>第一个客人点单(一个请求来了)。</li>
  581. <li>厨师开始做这道菜(处理这个请求)。</li>
  582. <li><strong>关键点:</strong> 在这道菜完全做好、端给客人之前,即使第二个客人已经点好单,厨师也不会开始做第二道菜。他必须等第一道菜完成。如果第一道菜是“佛跳墙”(一个很慢的操作,比如等待数据库、等待外部 API、或者等待大模型生成结果),那么后面所有的客人都要排队等着。</li>
  583. </ul>
  584. </li>
  585. <li>
  586. <p>代码示例 (简化示意):</p>
  587. <div class="highlight"><pre><span></span><code><span class="c1"># Flask (同步)</span>
  588. <span class="kn">from</span><span class="w"> </span><span class="nn">flask</span><span class="w"> </span><span class="kn">import</span> <span class="n">Flask</span>
  589. <span class="kn">import</span><span class="w"> </span><span class="nn">time</span>
  590. <span class="n">app</span> <span class="o">=</span> <span class="n">Flask</span><span class="p">(</span><span class="vm">__name__</span><span class="p">)</span>
  591. <span class="nd">@app</span><span class="o">.</span><span class="n">route</span><span class="p">(</span><span class="s1">&#39;/cook_sync&#39;</span><span class="p">)</span>
  592. <span class="k">def</span><span class="w"> </span><span class="nf">cook_sync</span><span class="p">():</span>
  593. <span class="nb">print</span><span class="p">(</span><span class="s2">&quot;开始做菜 A...&quot;</span><span class="p">)</span>
  594. <span class="n">time</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="mi">5</span><span class="p">)</span> <span class="c1"># 模拟做一个很慢的菜 (比如等大模型响应)</span>
  595. <span class="nb">print</span><span class="p">(</span><span class="s2">&quot;菜 A 做好了!&quot;</span><span class="p">)</span>
  596. <span class="k">return</span> <span class="s2">&quot;菜 A 完成&quot;</span>
  597. <span class="c1"># 当一个请求访问 /cook_sync 时,服务器会卡住 5 秒,</span>
  598. <span class="c1"># 这期间无法处理其他请求(除非你开了多个服务员/进程)。</span>
  599. </code></pre></div>
  600. </li>
  601. <li>
  602. <p><strong>特点:</strong> 简单直接,符合我们通常的编程思路(一步接一步)。但是,如果某个步骤很慢(等待 I/O 操作),整个流程就会被阻塞,效率不高,无法同时处理很多“等待中”的任务。</p>
  603. </li>
  604. <li>
  605. <p><strong>FastAPI 的异步路由 (Asynchronous): 就像一个很厉害的厨师,他可以同时处理多个任务。</strong></p>
  606. </li>
  607. <li>
  608. <p>工作方式:</p>
  609. <ul>
  610. <li>第一个客人点单(请求 1)。厨师开始做菜 A,比如先把米饭放进电饭煲(开始一个需要等待的操作,比如请求大模型)。</li>
  611. <li><strong>关键点:</strong> 在等待米饭煮熟(等待大模型响应)的时候,厨师<strong>不会闲着</strong>。他会立刻去看有没有其他客人的订单(处理请求 2)。</li>
  612. <li>第二个客人点单(请求 2)。厨师开始处理菜 B,比如开始洗菜(执行一些快代码)。</li>
  613. <li>如果菜 B 也需要等待(比如等水烧开),厨师又会去看有没有其他事做(处理请求 3 或查看米饭是否熟了)。</li>
  614. <li>一旦米饭煮熟了(大模型的响应回来了),厨师就会回来继续完成菜 A 的后续步骤。</li>
  615. </ul>
  616. </li>
  617. <li>
  618. <p>代码示例 (简化示意):</p>
  619. <div class="highlight"><pre><span></span><code><span class="c1"># FastAPI (异步)</span>
  620. <span class="kn">from</span><span class="w"> </span><span class="nn">fastapi</span><span class="w"> </span><span class="kn">import</span> <span class="n">FastAPI</span>
  621. <span class="kn">import</span><span class="w"> </span><span class="nn">asyncio</span> <span class="c1"># Python 的异步库</span>
  622. <span class="n">app</span> <span class="o">=</span> <span class="n">FastAPI</span><span class="p">()</span>
  623. <span class="nd">@app</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="s1">&#39;/cook_async&#39;</span><span class="p">)</span>
  624. <span class="k">async</span> <span class="k">def</span><span class="w"> </span><span class="nf">cook_async</span><span class="p">():</span> <span class="c1"># 注意这里的 async</span>
  625. <span class="nb">print</span><span class="p">(</span><span class="s2">&quot;开始做菜 A (异步)...&quot;</span><span class="p">)</span>
  626. <span class="k">await</span> <span class="n">asyncio</span><span class="o">.</span><span class="n">sleep</span><span class="p">(</span><span class="mi">5</span><span class="p">)</span> <span class="c1"># 模拟做一个很慢的菜,但这里用 await</span>
  627. <span class="c1"># 表示“在这里等待,但允许服务器去做别的事”</span>
  628. <span class="nb">print</span><span class="p">(</span><span class="s2">&quot;菜 A (异步) 做好了!&quot;</span><span class="p">)</span>
  629. <span class="k">return</span> <span class="s2">&quot;菜 A (异步) 完成&quot;</span>
  630. <span class="c1"># 当一个请求访问 /cook_async 时,服务器在 `await asyncio.sleep(5)` 这里</span>
  631. <span class="c1"># 会“暂停”这个任务,转而去处理其他进来的请求。5秒后,当等待结束,</span>
  632. <span class="c1"># 服务器会回来继续执行这个任务。这使得服务器能同时处理很多“等待中”的请求。</span>
  633. </code></pre></div>
  634. </li>
  635. <li>
  636. <p><strong>特点:</strong> 需要使用 <code>async</code> 和 <code>await</code> 关键字。特别擅长处理那些包含等待时间(I/O 密集型,如网络请求、读写文件、数据库查询、等待大模型响应)的任务。同一个厨师(服务器进程)可以同时“照看”很多道菜,大大提高了效率(并发能力)。</p>
  637. </li>
  638. </ol>
  639. <h2 id="llm">三、在利用大模型(LLM)部署时怎么选择?<a class="headerlink" href="#llm" title="Permanent link">&para;</a></h2>
  640. <p><strong>答案:强烈推荐使用 FastAPI (异步)。</strong></p>
  641. <p><strong>原因:</strong></p>
  642. <ol>
  643. <li><strong>LLM 调用是典型的 I/O 密集型操作:</strong> 当你的 API 调用一个大模型(无论是本地部署的还是云上的 API),你的程序需要等待模型进行计算并返回结果。这个等待时间可能从几百毫秒到几秒甚至更长。</li>
  644. <li>异步能极大提高并发处理能力:</li>
  645. <li>使用 <strong>Flask (同步)</strong>,当一个请求在等待 LLM 响应时,处理这个请求的那个服务器进程/线程就完全卡住了,不能为其他用户服务。如果你想同时服务 100 个用户,你可能需要启动 100 个(甚至更多)Flask 工作进程,这会消耗大量内存和 CPU 资源。</li>
  646. <li>使用 <strong>FastAPI (异步)</strong>,当一个请求 <code>await</code> LLM 的响应时,服务器会把这个任务暂时挂起,然后立即去处理其他用户的请求。当 LLM 的响应回来后,服务器再继续处理之前挂起的任务。这样,一个 FastAPI 进程就能同时处理成百上千个“等待 LLM 响应”的并发请求,资源利用率极高。</li>
  647. <li><strong>FastAPI 的内置特性很方便:</strong> FastAPI 基于 Pydantic 进行自动的数据校验和文档生成(Swagger UI / ReDoc)。这对于定义清晰的 LLM 输入(如 prompt、参数)和输出结构非常有帮助,能减少很多模板代码,提高开发效率和接口质量。</li>
  648. </ol>
  649. <p><strong>简单来说:</strong></p>
  650. <ul>
  651. <li>如果你希望你的 LLM 应用能够同时服务很多用户,并且高效地利用服务器资源,<strong>FastAPI 的异步特性是巨大的优势</strong>。</li>
  652. <li>如果你只是做一个内部小工具,用户量极少,或者你的团队完全不熟悉异步编程且不愿意学习,用 Flask 也能实现功能,但性能和并发能力会差很多,需要更多服务器资源来弥补。</li>
  653. </ul>
  654. <p><strong>结论:</strong> 对于需要调用大模型的场景,FastAPI 的异步模型几乎是必然的选择,因为它能更好地应对 LLM 调用带来的等待时间,实现高并发、高性能的服务。</p>
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