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学习笔记:第一章 核心算法、代码、公式内容总结整理

  • 2026-02-13 12:15:33
学习笔记:第一章 核心算法、代码、公式内容总结整理

《人工智能:复杂问题求解的结构和策略》第一章作为全书开篇,核心是搭建AI的历史与应用框架,无大量实操性算法/代码/公式,但梳理了后续技术的底层基础逻辑、关键数学工具和核心算法雏形,以下是精准整理:

一、核心数学公式(AI的底层数学基础)

1. 布尔代数(逻辑运算,AI符号推理的核心)

布尔代数将逻辑推理转化为可计算的数学运算,是AI形式化表示的基础,核心公式如下:

运算类型

公式(符号)

自然语言解释

示例

逻辑与(AND)

A ∧ B =  当且仅当 A =1 且 B=1

两个条件同时满足时结果为真

“下雨 ∧ 没伞”=真 → 会被淋湿

逻辑或(OR)

A V B = 1 当且仅当 A= 1 或 B= 1

至少一个条件满足时结果为真

“有公交 V 有地铁”=真 → 能出行

逻辑非(NOT)

¬A = 1 当且仅当 A= 0

条件取反

¬(晴天)= 阴天/雨天

德摩根定律

¬(A ∧ B) = ¬A ∨ ¬¬(A ∨ B) = ¬A ∧ ¬B

与/或运算的否定转换

“并非(有钱且有时间)”=“没钱 或 没时间”

2. 三段论(形式逻辑,AI推理的雏形)

亚里士多德提出的核心推理规则,无严格数学公式,但可形式化表示为:

3. 图灵机(可计算性理论,AI的计算基础)

图灵机是抽象计算模型,核心定义用数学符号表示为:

其中:

→ 核心意义:证明任何可计算问题都能通过“状态转移+读写操作”机械实现,为AI算法提供理论依据。

二、核心算法雏形(无完整代码,仅关键逻辑框架)

第一章未给出可运行的完整代码,但梳理了AI核心算法的早期雏形,以下是关键逻辑的伪代码/框架:

1. 状态空间搜索(博弈/问题求解的核心,后续章节重点)

核心思路:将问题建模为“状态图”(节点=问题状态,边=合法操作),通过搜索找到从初始状态到目标状态的路径。

伪代码框架(基础深度优先搜索,DFS):

# 状态空间搜索伪代码(DFS)def state_space_search(initial_state, goal_state):    # 初始化:栈存储待探索状态,集合存储已访问状态    stack = [initial_state]    visited = set()    while stack:        current_state = stack.pop()  # 深度优先:后进先出        if current_state == goal_state:            return "找到解!"  # 返回路径/操作序列(后续扩展)        if current_state in visited:            continue        visited.add(current_state)        # 生成当前状态的所有合法后继状态        for next_state in generate_successors(current_state):            if next_state not in visited:                stack.append(next_state)    return "无解"# 辅助函数:生成合法后继状态(需根据具体问题实现,如棋局走法、路径移动)def generate_successors(state):    successors = []    # 问题相关逻辑:如九宫游戏中,移动空白格生成新状态    return successors

→ 应用场景:第一章提到的博弈(下棋、九宫游戏)、路径规划等。

2. 专家系统推理(规则匹配,AI早期核心应用)

核心思路:将领域知识转化为“IF-条件 THEN-动作/结论”规则,通过匹配事实触发规则。

伪代码框架:

# 专家系统规则推理伪代码# 定义规则库(示例:医疗诊断规则)rules = [    {"条件": ["发烧""咳嗽"], "结论""可能感冒"},    {"条件": ["发烧""喉咙痛""乏力"], "结论""可能流感"},    {"条件": ["胸痛""呼吸困难"], "结论""需排查肺炎"}]def expert_system_reasoning(facts):    # facts:用户输入的事实(如["发烧", "咳嗽"])    for rule in rules:        # 检查规则条件是否全部匹配        if all(condition in facts for condition in rule["条件"]):            return rule["结论"]    return "无法判断,请补充症状"# 测试print(expert_system_reasoning(["发烧""咳嗽"]))  # 输出:可能感冒

→ 应用场景:第一章提到的MYCIN(医疗诊断)、DENDRAL(化学分子分析)等专家系统。

3. 图灵测试(AI智能评估,无算法但有判定逻辑)

核心逻辑伪代码:

# 图灵测试判定伪代码def turing_test(human_responses, machine_responses, judge_answers):    # human_responses:人类回答列表;machine_responses:机器回答列表    # judge_answers:评判者的判断(如["人类", "机器", "人类"...])    human_count = judge_answers.count("人类")    machine_count = judge_answers.count("机器")    # 若评判者对机器的误判率≥50%,则认为机器通过测试    if machine_count / (human_count + machine_count) ≥ 0.5:        return "机器通过图灵测试"    else:        return "机器未通过图灵测试"

三、关键说明(第一章的特殊性)

  1. 无“可直接运行的完整代码”:第一章是AI的“思想与应用总览”,聚焦历史、定义、应用场景,核心算法(如A*搜索、贝叶斯推理)、完整代码(如Prolog/Java实现)均在后续章节展开;

  2. 公式/算法的定位:本章的公式(布尔代数、图灵机)是AI的“底层数学基石”,算法雏形(状态搜索、规则推理)是后续章节技术的“框架铺垫”;

  3. 核心价值:理解这些基础逻辑,能为后续学习谓词演算、启发式搜索、机器学习算法建立认知框架。

四、总结

类别

核心内容

后续关联章节

数学公式

布尔代数(逻辑运算)、三段论(形式推理)、图灵机(可计算性)

第2章(谓词演算)、第5章(随机方法)

算法雏形

状态空间搜索(DFS)、专家系统规则匹配、图灵测试判定逻辑

第3章(状态空间搜索)、第8章(专家系统)

代码

无完整可运行代码,仅伪代码框架(核心逻辑)

第6章(控制算法)、第14章(Prolog实现)

核心意义

搭建AI的“数学-逻辑-计算”基础框架,明确算法/代码的最终目标:智能行为自动化

全书中所有技术章节

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  1. CONNECT:[ UseTime:0.000901s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001464s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000311s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000298s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000644s ]
  6. SELECT * FROM `set` [ RunTime:0.000235s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000667s ]
  8. SELECT * FROM `article` WHERE `id` = 461149 LIMIT 1 [ RunTime:0.000571s ]
  9. UPDATE `article` SET `lasttime` = 1771046586 WHERE `id` = 461149 [ RunTime:0.005237s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000257s ]
  11. SELECT * FROM `article` WHERE `id` < 461149 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000903s ]
  12. SELECT * FROM `article` WHERE `id` > 461149 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000413s ]
  13. SELECT * FROM `article` WHERE `id` < 461149 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.009642s ]
  14. SELECT * FROM `article` WHERE `id` < 461149 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001492s ]
  15. SELECT * FROM `article` WHERE `id` < 461149 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008798s ]
0.113343s