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   "source": [
    "# 2.1 算法原理"
   ]
  },
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   "metadata": {},
   "source": [
    "## 2.1.1 贝叶斯决策论"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### 2.1.1.1 问题描述"
   ]
  },
  {
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   "metadata": {},
   "source": [
    "![1](Picture/1.jpg)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### 2.1.1.2 最小错误率决策"
   ]
  },
  {
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   "metadata": {},
   "source": [
    "![2](Picture/2.png)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "### 2.1.1.3 贝叶斯决策"
   ]
  },
  {
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   "metadata": {},
   "source": [
    "![3](Picture/3.png)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "![4](Picture/4.png)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "![5](Picture/5.png)"
   ]
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  {
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   "metadata": {},
   "source": [
    "## 2.1.2 贝叶斯分类器"
   ]
  },
  {
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   "metadata": {},
   "source": [
    "![6](Picture/6.png)"
   ]
  },
  {
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   "metadata": {},
   "source": [
    "### 2.1.2.1 判决函数与决策面"
   ]
  },
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   "metadata": {},
   "source": [
    "![7](Picture/7.png)"
   ]
  },
  {
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   "metadata": {},
   "source": [
    "### 2.1.2.2 高斯密度函数"
   ]
  },
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   "metadata": {},
   "source": [
    "![8](Picture/8.png)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "![9](Picture/9.png)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "![10](Picture/10.png)"
   ]
  },
  {
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   "metadata": {},
   "source": [
    "![11](Picture/11.png)"
   ]
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  {
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   "metadata": {},
   "source": [
    "### 2.1.2.3 高斯密度函数下的判别函数"
   ]
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   "metadata": {},
   "source": [
    "![12](Picture/12.png)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "![13](Picture/13.png)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "![14](Picture/14.png)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "![15](Picture/15.png)"
   ]
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  {
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   "metadata": {},
   "source": [
    "### 2.1.2.4 离散变量的贝叶斯决策"
   ]
  },
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   "metadata": {},
   "source": [
    "![16](Picture/16.png)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "![17](Picture/17.png)"
   ]
  },
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   "metadata": {},
   "source": [
    "### 2.1.2.5 朴素贝叶斯分类器"
   ]
  },
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   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "![18](Picture/18.png)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "![19](Picture/19.png)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "![20](Picture/20.png)"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "![21](Picture/21.png)"
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