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dspy,一个声明式的 Python 库

  • 2026-06-24 01:18:27
dspy,一个声明式的 Python 库

大家好,我是木木。

今天给大家分享一个声明式的 Python 库,dspy。

dspy

很多人做 LLM 应用时,会一直改 Prompt:加一句约束、换一个例子、再补一个格式说明。dspy 的思路不太一样,它更像是在说:别只手写 Prompt,要把 AI 程序写成可组合、可评估、可优化的模块。

所以它很适合放在这组 Agent/LLM 框架的最后讲。前面几个库更偏“流程和工具”,dspy 更偏“声明任务、评估效果、自动优化提示和程序行为”。

项目地址:https://github.com/stanfordnlp/dspy

官方文档:https://dspy.ai

三大特点

声明式任务

用 Signature 描述输入输出,而不是把所有要求堆进一段 Prompt 字符串。

模块化程序

PredictChainOfThoughtReAct 等模块可以像普通 Python 组件一样组合,适合构建可维护 AI 程序。

可评估优化

DSPy 强调数据、指标和优化器,让系统不只是“感觉更好”,而是能用样本和 metric 迭代。

最佳实践

安装方式python -m pip install dspy==3.2.1

下面的 Demo 不配置真实 LM,也不调用外部 API。它展示 DSPy 的 Signature、Example、Prediction 和 Evaluate 这些核心概念。

功能一:定义输入输出签名

这段代码解决什么问题:把“问题进来,答案出去”这种任务表达成结构,而不是写成一大段 Prompt。后续模块会基于这个签名组织调用。

importos,warnings,loggingos.environ['LITELLM_LOG']='ERROR'warnings.filterwarnings('ignore')logging.getLogger().setLevel(logging.ERROR)importdspytry:dspy.disable_logging()exceptException:passclassQA(dspy.Signature):"""回答用户问题。"""question:str=dspy.InputField()answer:str=dspy.OutputField()module=dspy.Predict(QA)print('module:',type(module).__name__)print('signature:',module.signature.__name__)print('inputs:',''.join(module.signature.input_fields))print('outputs:',''.join(module.signature.output_fields))

Signature 的价值在于把任务边界变清楚。你不再只是维护字符串,而是在维护“这个 AI 组件应该吃什么、吐什么”。

功能二:用样本和预测表达效果

这段代码解决什么问题:AI 程序需要样本来评估。DSPy 的 Example 可以指定输入字段,Prediction 表示程序输出,这样后面才能用指标判断好坏。

importos,warnings,loggingos.environ['LITELLM_LOG']='ERROR'warnings.filterwarnings('ignore')logging.getLogger().setLevel(logging.ERROR)importdspytry:dspy.disable_logging()exceptException:passexample=dspy.Example(question='DSPy 关注什么?',answer='编程而不是手写提示词').with_inputs('question')prediction=dspy.Prediction(answer='编程而不是手写提示词')print('input keys:',''.join(example.inputs().toDict().keys()))print('label:',example.answer)print('prediction:',prediction.answer)print('match:',example.answer==prediction.answer)

这一步看起来简单,但很关键。没有样本和指标,Prompt 优化就容易变成玄学;有了样本和指标,迭代才有方向。

环境与版本信息

  • Demo 环境:Windows 11,Python 3.11
  • 本文安装的 dspy 版本:3.2.1
  • 当前包要求 Python:>=3.10,<3.15
  • 关键依赖版本:litellm 1.83.0gepa 0.0.27
  • 官方定位:Programming, not prompting, LMs

高级功能

这段代码解决什么问题:给 AI 程序配置评估集和 metric,跑出一个可量化分数。真实项目里,优化器会依赖这些样本和指标来改进程序行为。

importos,warnings,loggingos.environ['LITELLM_LOG']='ERROR'warnings.filterwarnings('ignore')logging.getLogger().setLevel(logging.ERROR)importdspyfromdspy.evaluateimportEvaluatetry:dspy.disable_logging()exceptException:passexample=dspy.Example(question='DSPy 关注什么?',answer='编程而不是手写提示词').with_inputs('question')defprogram(question):returndspy.Prediction(answer='编程而不是手写提示词')defmetric(example,pred,trace=None):returnexample.answer==pred.answerresult=Evaluate(devset=[example],metric=metric,display_progress=False)(program)print('score:',result.score)print('items:',len(result.results))print('metric ok:',result.score==100.0)

DSPy 的优化能力要建立在好数据和好指标上。指标设计得差,优化器也只会把系统带向错误目标。

适用场景

  • 你想把 Prompt 工程升级成可声明、可评估、可优化的 AI 程序
  • 你有样本集和评价指标,希望系统能按指标迭代
  • 你在做 RAG、分类、抽取、Agent 或多阶段推理流程

不适用场景

  • 只是一次简单问答,没必要引入评估和优化框架
  • 你没有样本、没有指标,只想凭感觉调 Prompt
  • 团队还没准备好把 AI 行为当成程序来测试和维护

上线检查

  1. 先定义清楚 Signature,再考虑模块和优化器。
  2. 准备覆盖真实场景的样本集,不要只用几个理想例子。
  3. 指标要能代表业务目标,避免优化器把系统带偏。

总结

dspy 的核心不是“又一个 Prompt 框架”,而是把 LLM 应用当成可编程、可评估、可优化的软件。它适合那些已经不满足于手写 Prompt,想用工程方法迭代 AI 行为的团队。

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  1. CONNECT:[ UseTime:0.000617s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000914s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001992s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000265s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000551s ]
  6. SELECT * FROM `set` [ RunTime:0.000256s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000597s ]
  8. SELECT * FROM `article` WHERE `id` = 493866 LIMIT 1 [ RunTime:0.002248s ]
  9. UPDATE `article` SET `lasttime` = 1783038522 WHERE `id` = 493866 [ RunTime:0.010152s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000340s ]
  11. SELECT * FROM `article` WHERE `id` < 493866 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000723s ]
  12. SELECT * FROM `article` WHERE `id` > 493866 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000644s ]
  13. SELECT * FROM `article` WHERE `id` < 493866 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001567s ]
  14. SELECT * FROM `article` WHERE `id` < 493866 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.005252s ]
  15. SELECT * FROM `article` WHERE `id` < 493866 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003032s ]
0.098027s