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AI 与社会(上)

AI 与社会(上)

AI 与社会(上)

「吴恩达AI课 · AI for Everyone」第 7/8 篇

课程:AI for Everyone · 讲师:Andrew Ng(吴恩达)
平台:DeepLearning.AI · 整理日期:2026-06-15

本课位置

前三周讲的是 AI 技术、项目和组织转型。最后一周不再谈"能不能做",而是谈 "应不应该做"——当技术落到真实社会里,它会带来偏见、被恶意利用、加剧不平等。这一篇聚焦:AI 的真实局限、偏见从何而来、以及怎么防御攻击。


第 36 课:第 4 周导论

原课链接: Week 4 Introduction[1]
时长: 2m

课程截图:第 4 周导论

核心要点

AI 不仅在改变企业和产业,也在深刻改变社会。这一周的目的是让你对 AI 的社会影响有一个理性、平衡的认知——既不过度恐惧,也不盲目乐观。


第 37 课:对 AI 的现实看法

原课链接: A Realistic View of AI[2]
时长: 7m

课程截图:对 AI 的现实看法

这一课解决什么问题

公众对 AI 的认知在两个极端之间摇摆:要么把 AI 当万能魔法,要么把它当终结者。这一课帮你建立介于崇拜和恐惧之间的理性地带

核心要点

AI 有明确的局限性:

1可解释性差——大多数深度学习模型是"黑盒"。它告诉你结论,但不一定告诉你为什么。这在医疗、贷款审批等场景尤其成问题。
2容易受数据偏差影响——模型反映的是训练数据的模式,而不是"世界应该怎样"。
3领域迁移困难——在 A 医院训练的肺炎检测模型,换到 B 医院、用不同扫描仪拍出的片子,可能完全不准确。
4没有真正的理解——AI 只是模式匹配,它不懂因果关系、不懂常识、不懂语境。

实用原则:不要因为 AI 不完美就拒绝使用,也不要因为它效果好就无条件信任。

正确的态度是:理解 AI 在哪些具体任务上表现好、在哪些方面不可靠,然后为每个项目设置合理的预期和防护机制。


第 38 课:歧视与偏见

原课链接: Discrimination / Bias[3]
时长: 9m

课程截图:歧视与偏见

这一课解决什么问题

"AI 是客观的、不带偏见的"——这个观念是错的。AI 不仅会继承人类历史数据中的偏见,还可能放大它。

核心要点

偏见从哪来?

1训练数据的偏差——如果历史上招聘经理更倾向于录用男性,用这些数据训练的简历筛选 AI 就会学到同样的性别偏好
2数据收集的偏见——人脸识别系统在浅肤色上训练效果远好于深肤色,因为训练数据本身就不够多样化
3标签的偏见——让人类标注"这个求职者是否适合录用",标注者自身的偏见就会进入模型

怎么减少偏见:
- 改进数据:确保训练数据充分代表所有目标用户群体
- 技术审核:在模型上线前,对不同子群体的表现做差异分析
- 定义公平指标:不只追求"整体准确率最高",也要看"各群体之间的准确率差异最小"
- 建立多元化的团队:当设计团队包括不同背景的人时,更容易发现模型中的偏见盲区

关键认知:零偏见是不现实的,但可以减少偏见带来的伤害。 发现问题远比假装没有偏见要好。


第 39 课:针对 AI 的对抗攻击

原课链接: Adversarial Attacks on AI[4]
时长: 7m

课程截图:针对 AI 的对抗攻击

这一课解决什么问题

AI 系统看起来很强大,但实际上可能被对人来说完全看不出来的微小扰动骗到。这些攻击不是理论上的——它们已经在真实场景中发生。

核心要点

两种对抗攻击类型:

数字对抗攻击:
- 对一张图片的像素做人类眼睛无法察觉的微小改动
- 修改后的图片对 AI 来说可能完全变成另一个东西
- 例:一张熊猫图片加上微小噪声 → 人看起来还是熊猫 → AI 以 99% 的置信度判断为长臂猿

物理对抗攻击:
- 在真实物体上做改动来欺骗 AI
- 例:在停车标志上贴几个小贴纸 → 人仍然认得是停车标志 → 自动驾驶 AI 判断为"限速 80"
- 例:戴一幅特定图案的眼镜,就能骗过人脸识别系统

防御策略:
- 在训练数据中加入对抗样本
- 多重验证:不只依赖一个模型做关键决策
- 永远假设 AI 系统会遇到恶意输入,在安全相关的应用中尤其如此


下一篇:AI 与社会(下)(AI 的有害用途、发展中经济体、就业影响 + 课程总结)

END

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参考链接

[1] Week 4 Introduction: https://learn.deeplearning.ai/courses/ai-for-everyone/lesson/m6mae/week-4-introduction

[2] A Realistic View of AI: https://learn.deeplearning.ai/courses/ai-for-everyone/lesson/ziua7/a-realistic-view-of-ai

[3] Discrimination / Bias: https://learn.deeplearning.ai/courses/ai-for-everyone/lesson/zzs1g/discrimination-bias

[4] Adversarial Attacks on AI: https://learn.deeplearning.ai/courses/ai-for-everyone/lesson/otcg4/adversarial-attacks-on-ai

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  1. CONNECT:[ UseTime:0.001106s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001426s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000712s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000688s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001246s ]
  6. SELECT * FROM `set` [ RunTime:0.001779s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001963s ]
  8. SELECT * FROM `article` WHERE `id` = 772371 LIMIT 1 [ RunTime:0.001355s ]
  9. UPDATE `article` SET `lasttime` = 1781954410 WHERE `id` = 772371 [ RunTime:0.003819s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000708s ]
  11. SELECT * FROM `article` WHERE `id` < 772371 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001289s ]
  12. SELECT * FROM `article` WHERE `id` > 772371 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001298s ]
  13. SELECT * FROM `article` WHERE `id` < 772371 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002580s ]
  14. SELECT * FROM `article` WHERE `id` < 772371 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002379s ]
  15. SELECT * FROM `article` WHERE `id` < 772371 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007051s ]
0.207580s