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"# 概率\n",
":label:`sec_prob`\n",
"\n",
"简单地说,机器学习就是做出预测。\n",
"\n",
"根据病人的临床病史,我们可能想预测他们在下一年心脏病发作的*概率*。\n",
"在飞机喷气发动机的异常检测中,我们想要评估一组发动机读数为正常运行情况的概率有多大。\n",
"在强化学习中,我们希望智能体(agent)能在一个环境中智能地行动。\n",
"这意味着我们需要考虑在每种可行的行为下获得高奖励的概率。\n",
"当我们建立推荐系统时,我们也需要考虑概率。\n",
"例如,假设我们为一家大型在线书店工作,我们可能希望估计某些用户购买特定图书的概率。\n",
"为此,我们需要使用概率学。\n",
"有完整的课程、专业、论文、职业、甚至院系,都致力于概率学的工作。\n",
"所以很自然地,我们在这部分的目标不是教授整个科目。\n",
"相反,我们希望教给读者基础的概率知识,使读者能够开始构建第一个深度学习模型,\n",
"以便读者可以开始自己探索它。\n",
"\n",
"现在让我们更认真地考虑第一个例子:根据照片区分猫和狗。\n",
"这听起来可能很简单,但对于机器却可能是一个艰巨的挑战。\n",
"首先,问题的难度可能取决于图像的分辨率。\n",
"\n",
"![不同分辨率的图像 ($10 \\times 10$, $20 \\times 20$, $40 \\times 40$, $80 \\times 80$, 和 $160 \\times 160$ pixels)](../img/cat-dog-pixels.png)\n",
":width:`300px`\n",
":label:`fig_cat_dog`\n",
"\n",
"如 :numref:`fig_cat_dog`所示,虽然人类很容易以$160 \\times 160$像素的分辨率识别猫和狗,\n",
"但它在$40\\times40$像素上变得具有挑战性,而且在$10 \\times 10$像素下几乎是不可能的。\n",
"换句话说,我们在很远的距离(从而降低分辨率)区分猫和狗的能力可能会变为猜测。\n",
"概率给了我们一种正式的途径来说明我们的确定性水平。\n",
"如果我们完全肯定图像是一只猫,我们说标签$y$是\"猫\"的*概率*,表示为$P(y=$\"猫\"$)$等于$1$。\n",
"如果我们没有证据表明$y=$“猫”或$y=$“狗”,那么我们可以说这两种可能性是相等的,\n",
"即$P(y=$\"猫\"$)=P(y=$\"狗\"$)=0.5$。\n",
"如果我们不十分确定图像描绘的是一只猫,我们可以将概率赋值为$0.5<P(y=$\"猫\"$)<1$。\n",
"\n",
"现在考虑第二个例子:给出一些天气监测数据,我们想预测明天北京下雨的概率。\n",
"如果是夏天,下雨的概率是0.5。\n",
"\n",
"在这两种情况下,我们都不确定结果,但这两种情况之间有一个关键区别。\n",
"在第一种情况中,图像实际上是狗或猫二选一。\n",
"在第二种情况下,结果实际上是一个随机的事件。\n",
"因此,概率是一种灵活的语言,用于说明我们的确定程度,并且它可以有效地应用于广泛的领域中。\n",
"\n",
"## 基本概率论\n",
"\n",
"假设我们掷骰子,想知道看到1的几率有多大,而不是看到另一个数字。\n",
"如果骰子是公平的,那么所有六个结果$\\{1, \\ldots, 6\\}$都有相同的可能发生,\n",
"因此我们可以说$1$发生的概率为$\\frac{1}{6}$。\n",
"\n",
"然而现实生活中,对于我们从工厂收到的真实骰子,我们需要检查它是否有瑕疵。\n",
"检查骰子的唯一方法是多次投掷并记录结果。\n",
"对于每个骰子,我们将观察到$\\{1, \\ldots, 6\\}$中的一个值。\n",
"对于每个值,一种自然的方法是将它出现的次数除以投掷的总次数,\n",
"即此*事件*event)概率的*估计值*。\n",
"*大数定律*law of large numbers)告诉我们:\n",
"随着投掷次数的增加,这个估计值会越来越接近真实的潜在概率。\n",
"让我们用代码试一试!\n",
"\n",
"首先,我们导入必要的软件包。\n"
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"%matplotlib inline\n",
"import torch\n",
"from torch.distributions import multinomial\n",
"from d2l import torch as d2l"
]
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"在统计学中,我们把从概率分布中抽取样本的过程称为*抽样*(sampling)。\n",
"笼统来说,可以把*分布*distribution)看作对事件的概率分配,\n",
"稍后我们将给出的更正式定义。\n",
"将概率分配给一些离散选择的分布称为*多项分布*multinomial distribution)。\n",
"\n",
"为了抽取一个样本,即掷骰子,我们只需传入一个概率向量。\n",
"输出是另一个相同长度的向量:它在索引$i$处的值是采样结果中$i$出现的次数。\n"
]
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"fair_probs = torch.ones([6]) / 6\n",
"multinomial.Multinomial(1, fair_probs).sample()"
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"在估计一个骰子的公平性时,我们希望从同一分布中生成多个样本。\n",
"如果用Python的for循环来完成这个任务,速度会慢得惊人。\n",
"因此我们使用深度学习框架的函数同时抽取多个样本,得到我们想要的任意形状的独立样本数组。\n"
]
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"multinomial.Multinomial(10, fair_probs).sample()"
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"现在我们知道如何对骰子进行采样,我们可以模拟1000次投掷。\n",
"然后,我们可以统计1000次投掷后,每个数字被投中了多少次。\n",
"具体来说,我们计算相对频率,以作为真实概率的估计。\n"
]
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"# 将结果存储为32位浮点数以进行除法\n",
"counts = multinomial.Multinomial(1000, fair_probs).sample()\n",
"counts / 1000 # 相对频率作为估计值"
]
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"因为我们是从一个公平的骰子中生成的数据,我们知道每个结果都有真实的概率$\\frac{1}{6}$\n",
"大约是$0.167$,所以上面输出的估计值看起来不错。\n",
"\n",
"我们也可以看到这些概率如何随着时间的推移收敛到真实概率。\n",
"让我们进行500组实验,每组抽取10个样本。\n"
]
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"counts = multinomial.Multinomial(10, fair_probs).sample((500,))\n",
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"每条实线对应于骰子的6个值中的一个,并给出骰子在每组实验后出现值的估计概率。\n",
"当我们通过更多的实验获得更多的数据时,这$6$条实体曲线向真实概率收敛。\n",
"\n",
"### 概率论公理\n",
"\n",
"在处理骰子掷出时,我们将集合$\\mathcal{S} = \\{1, 2, 3, 4, 5, 6\\}$\n",
"称为*样本空间*sample space)或*结果空间*outcome space),\n",
"其中每个元素都是*结果*outcome)。\n",
"*事件*(event)是一组给定样本空间的随机结果。\n",
"例如,“看到$5$”($\\{5\\}$)和“看到奇数”($\\{1, 3, 5\\}$)都是掷出骰子的有效事件。\n",
"注意,如果一个随机实验的结果在$\\mathcal{A}$中,则事件$\\mathcal{A}$已经发生。\n",
"也就是说,如果投掷出$3$点,因为$3 \\in \\{1, 3, 5\\}$,我们可以说,“看到奇数”的事件发生了。\n",
"\n",
"*概率*probability)可以被认为是将集合映射到真实值的函数。\n",
"在给定的样本空间$\\mathcal{S}$中,事件$\\mathcal{A}$的概率,\n",
"表示为$P(\\mathcal{A})$,满足以下属性:\n",
"\n",
"* 对于任意事件$\\mathcal{A}$,其概率从不会是负数,即$P(\\mathcal{A}) \\geq 0$\n",
"* 整个样本空间的概率为$1$,即$P(\\mathcal{S}) = 1$\n",
"* 对于*互斥*mutually exclusive)事件(对于所有$i \\neq j$都有$\\mathcal{A}_i \\cap \\mathcal{A}_j = \\emptyset$)的任意一个可数序列$\\mathcal{A}_1, \\mathcal{A}_2, \\ldots$,序列中任意一个事件发生的概率等于它们各自发生的概率之和,即$P(\\bigcup_{i=1}^{\\infty} \\mathcal{A}_i) = \\sum_{i=1}^{\\infty} P(\\mathcal{A}_i)$。\n",
"\n",
"以上也是概率论的公理,由科尔莫戈罗夫于1933年提出。\n",
"有了这个公理系统,我们可以避免任何关于随机性的哲学争论;\n",
"相反,我们可以用数学语言严格地推理。\n",
"例如,假设事件$\\mathcal{A}_1$为整个样本空间,\n",
"且当所有$i > 1$时的$\\mathcal{A}_i = \\emptyset$\n",
"那么我们可以证明$P(\\emptyset) = 0$,即不可能发生事件的概率是$0$。\n",
"\n",
"### 随机变量\n",
"\n",
"在我们掷骰子的随机实验中,我们引入了*随机变量*(random variable)的概念。\n",
"随机变量几乎可以是任何数量,并且它可以在随机实验的一组可能性中取一个值。\n",
"考虑一个随机变量$X$,其值在掷骰子的样本空间$\\mathcal{S}=\\{1,2,3,4,5,6\\}$中。\n",
"我们可以将事件“看到一个$5$”表示为$\\{X=5\\}$或$X=5$\n",
"其概率表示为$P(\\{X=5\\})$或$P(X=5)$。\n",
"通过$P(X=a)$,我们区分了随机变量$X$和$X$可以采取的值(例如$a$)。\n",
"然而,这可能会导致繁琐的表示。\n",
"为了简化符号,一方面,我们可以将$P(X)$表示为随机变量$X$上的*分布*distribution):\n",
"分布告诉我们$X$获得某一值的概率。\n",
"另一方面,我们可以简单用$P(a)$表示随机变量取值$a$的概率。\n",
"由于概率论中的事件是来自样本空间的一组结果,因此我们可以为随机变量指定值的可取范围。\n",
"例如,$P(1 \\leq X \\leq 3)$表示事件$\\{1 \\leq X \\leq 3\\}$\n",
"即$\\{X = 1, 2, \\text{or}, 3\\}$的概率。\n",
"等价地,$P(1 \\leq X \\leq 3)$表示随机变量$X$从$\\{1, 2, 3\\}$中取值的概率。\n",
"\n",
"请注意,*离散*(discrete)随机变量(如骰子的每一面)\n",
"和*连续*continuous)随机变量(如人的体重和身高)之间存在微妙的区别。\n",
"现实生活中,测量两个人是否具有完全相同的身高没有太大意义。\n",
"如果我们进行足够精确的测量,最终会发现这个星球上没有两个人具有完全相同的身高。\n",
"在这种情况下,询问某人的身高是否落入给定的区间,比如是否在1.79米和1.81米之间更有意义。\n",
"在这些情况下,我们将这个看到某个数值的可能性量化为*密度*(density)。\n",
"高度恰好为1.80米的概率为0,但密度不是0。\n",
"在任何两个不同高度之间的区间,我们都有非零的概率。\n",
"在本节的其余部分中,我们将考虑离散空间中的概率。\n",
"连续随机变量的概率可以参考深度学习数学附录中[随机变量](https://d2l.ai/chapter_appendix-mathematics-for-deep-learning/random-variables.html)\n",
"的一节。\n",
"\n",
"## 处理多个随机变量\n",
"\n",
"很多时候,我们会考虑多个随机变量。\n",
"比如,我们可能需要对疾病和症状之间的关系进行建模。\n",
"给定一个疾病和一个症状,比如“流感”和“咳嗽”,以某个概率存在或不存在于某个患者身上。\n",
"我们需要估计这些概率以及概率之间的关系,以便我们可以运用我们的推断来实现更好的医疗服务。\n",
"\n",
"再举一个更复杂的例子:图像包含数百万像素,因此有数百万个随机变量。\n",
"在许多情况下,图像会附带一个*标签*(label),标识图像中的对象。\n",
"我们也可以将标签视为一个随机变量。\n",
"我们甚至可以将所有元数据视为随机变量,例如位置、时间、光圈、焦距、ISO、对焦距离和相机类型。\n",
"所有这些都是联合发生的随机变量。\n",
"当我们处理多个随机变量时,会有若干个变量是我们感兴趣的。\n",
"\n",
"### 联合概率\n",
"\n",
"第一个被称为*联合概率*joint probability$P(A=a,B=b)$。\n",
"给定任意值$a$和$b$,联合概率可以回答:$A=a$和$B=b$同时满足的概率是多少?\n",
"请注意,对于任何$a$和$b$的取值,$P(A = a, B=b) \\leq P(A=a)$。\n",
"这点是确定的,因为要同时发生$A=a$和$B=b$,$A=a$就必须发生,$B=b$也必须发生(反之亦然)。因此,$A=a$和$B=b$同时发生的可能性不大于$A=a$或是$B=b$单独发生的可能性。\n",
"\n",
"### 条件概率\n",
"\n",
"联合概率的不等式带给我们一个有趣的比率:\n",
"$0 \\leq \\frac{P(A=a, B=b)}{P(A=a)} \\leq 1$。\n",
"我们称这个比率为*条件概率*conditional probability),\n",
"并用$P(B=b \\mid A=a)$表示它:它是$B=b$的概率,前提是$A=a$已发生。\n",
"\n",
"### 贝叶斯定理\n",
"\n",
"使用条件概率的定义,我们可以得出统计学中最有用的方程之一:\n",
"*Bayes定理*Bayes' theorem)。\n",
"根据*乘法法则*multiplication rule )可得到$P(A, B) = P(B \\mid A) P(A)$。\n",
"根据对称性,可得到$P(A, B) = P(A \\mid B) P(B)$。\n",
"假设$P(B)>0$,求解其中一个条件变量,我们得到\n",
"\n",
"$$P(A \\mid B) = \\frac{P(B \\mid A) P(A)}{P(B)}.$$\n",
"\n",
"请注意,这里我们使用紧凑的表示法:\n",
"其中$P(A, B)$是一个*联合分布*joint distribution),\n",
"$P(A \\mid B)$是一个*条件分布*conditional distribution)。\n",
"这种分布可以在给定值$A = a, B=b$上进行求值。\n",
"\n",
"### 边际化\n",
"\n",
"为了能进行事件概率求和,我们需要*求和法则*(sum rule),\n",
"即$B$的概率相当于计算$A$的所有可能选择,并将所有选择的联合概率聚合在一起:\n",
"\n",
"$$P(B) = \\sum_{A} P(A, B),$$\n",
"\n",
"这也称为*边际化*marginalization)。\n",
"边际化结果的概率或分布称为*边际概率*marginal probability\n",
"或*边际分布*marginal distribution)。\n",
"\n",
"### 独立性\n",
"\n",
"另一个有用属性是*依赖*dependence)与*独立*independence)。\n",
"如果两个随机变量$A$和$B$是独立的,意味着事件$A$的发生跟$B$事件的发生无关。\n",
"在这种情况下,统计学家通常将这一点表述为$A \\perp B$。\n",
"根据贝叶斯定理,马上就能同样得到$P(A \\mid B) = P(A)$。\n",
"在所有其他情况下,我们称$A$和$B$依赖。\n",
"比如,两次连续抛出一个骰子的事件是相互独立的。\n",
"相比之下,灯开关的位置和房间的亮度并不是(因为可能存在灯泡坏掉、电源故障,或者开关故障)。\n",
"\n",
"由于$P(A \\mid B) = \\frac{P(A, B)}{P(B)} = P(A)$等价于$P(A, B) = P(A)P(B)$\n",
"因此两个随机变量是独立的,当且仅当两个随机变量的联合分布是其各自分布的乘积。\n",
"同样地,给定另一个随机变量$C$时,两个随机变量$A$和$B$是*条件独立的*conditionally independent),\n",
"当且仅当$P(A, B \\mid C) = P(A \\mid C)P(B \\mid C)$。\n",
"这个情况表示为$A \\perp B \\mid C$。\n",
"\n",
"### 应用\n",
":label:`subsec_probability_hiv_app`\n",
"\n",
"我们实战演练一下!\n",
"假设一个医生对患者进行艾滋病病毒(HIV)测试。\n",
"这个测试是相当准确的,如果患者健康但测试显示他患病,这个概率只有1%;\n",
"如果患者真正感染HIV,它永远不会检测不出。\n",
"我们使用$D_1$来表示诊断结果(如果阳性,则为$1$,如果阴性,则为$0$),\n",
"$H$来表示感染艾滋病病毒的状态(如果阳性,则为$1$,如果阴性,则为$0$)。\n",
"在 :numref:`conditional_prob_D1`中列出了这样的条件概率。\n",
"\n",
":条件概率为$P(D_1 \\mid H)$\n",
"\n",
"| 条件概率 | $H=1$ | $H=0$ |\n",
"|---|---|---|\n",
"|$P(D_1 = 1 \\mid H)$| 1 | 0.01 |\n",
"|$P(D_1 = 0 \\mid H)$| 0 | 0.99 |\n",
":label:`conditional_prob_D1`\n",
"\n",
"请注意,每列的加和都是1(但每行的加和不是),因为条件概率需要总和为1,就像概率一样。\n",
"让我们计算如果测试出来呈阳性,患者感染HIV的概率,即$P(H = 1 \\mid D_1 = 1)$。\n",
"显然,这将取决于疾病有多常见,因为它会影响错误警报的数量。\n",
"假设人口总体是相当健康的,例如,$P(H=1) = 0.0015$。\n",
"为了应用贝叶斯定理,我们需要运用边际化和乘法法则来确定\n",
"\n",
"$$\\begin{aligned}\n",
"&P(D_1 = 1) \\\\\n",
"=& P(D_1=1, H=0) + P(D_1=1, H=1) \\\\\n",
"=& P(D_1=1 \\mid H=0) P(H=0) + P(D_1=1 \\mid H=1) P(H=1) \\\\\n",
"=& 0.011485.\n",
"\\end{aligned}\n",
"$$\n",
"因此,我们得到\n",
"\n",
"$$\\begin{aligned}\n",
"&P(H = 1 \\mid D_1 = 1)\\\\ =& \\frac{P(D_1=1 \\mid H=1) P(H=1)}{P(D_1=1)} \\\\ =& 0.1306 \\end{aligned}.$$\n",
"\n",
"换句话说,尽管使用了非常准确的测试,患者实际上患有艾滋病的几率只有13.06%。\n",
"正如我们所看到的,概率可能是违反直觉的。\n",
"\n",
"患者在收到这样可怕的消息后应该怎么办?\n",
"很可能,患者会要求医生进行另一次测试来确定病情。\n",
"第二个测试具有不同的特性,它不如第一个测试那么精确,\n",
"如 :numref:`conditional_prob_D2`所示。\n",
"\n",
":条件概率为$P(D_2 \\mid H)$\n",
"\n",
"| 条件概率 | $H=1$ | $H=0$ |\n",
"|---|---|---|\n",
"|$P(D_2 = 1 \\mid H)$| 0.98 | 0.03 |\n",
"|$P(D_2 = 0 \\mid H)$| 0.02 | 0.97 |\n",
":label:`conditional_prob_D2`\n",
"\n",
"不幸的是,第二次测试也显示阳性。让我们通过假设条件独立性来计算出应用Bayes定理的必要概率:\n",
"\n",
"$$\\begin{aligned}\n",
"&P(D_1 = 1, D_2 = 1 \\mid H = 0) \\\\\n",
"=& P(D_1 = 1 \\mid H = 0) P(D_2 = 1 \\mid H = 0) \\\\\n",
"=& 0.0003,\n",
"\\end{aligned}\n",
"$$\n",
"\n",
"$$\\begin{aligned}\n",
"&P(D_1 = 1, D_2 = 1 \\mid H = 1) \\\\\n",
"=& P(D_1 = 1 \\mid H = 1) P(D_2 = 1 \\mid H = 1) \\\\\n",
"=& 0.98.\n",
"\\end{aligned}\n",
"$$\n",
"现在我们可以应用边际化和乘法规则:\n",
"\n",
"$$\\begin{aligned}\n",
"&P(D_1 = 1, D_2 = 1) \\\\\n",
"=& P(D_1 = 1, D_2 = 1, H = 0) + P(D_1 = 1, D_2 = 1, H = 1) \\\\\n",
"=& P(D_1 = 1, D_2 = 1 \\mid H = 0)P(H=0) + P(D_1 = 1, D_2 = 1 \\mid H = 1)P(H=1)\\\\\n",
"=& 0.00176955.\n",
"\\end{aligned}\n",
"$$\n",
"\n",
"最后,鉴于存在两次阳性检测,患者患有艾滋病的概率为\n",
"\n",
"$$\\begin{aligned}\n",
"&P(H = 1 \\mid D_1 = 1, D_2 = 1)\\\\\n",
"=& \\frac{P(D_1 = 1, D_2 = 1 \\mid H=1) P(H=1)}{P(D_1 = 1, D_2 = 1)} \\\\\n",
"=& 0.8307.\n",
"\\end{aligned}\n",
"$$\n",
"\n",
"也就是说,第二次测试使我们能够对患病的情况获得更高的信心。\n",
"尽管第二次检验比第一次检验的准确性要低得多,但它仍然显著提高我们的预测概率。\n",
"\n",
"## 期望和方差\n",
"\n",
"为了概括概率分布的关键特征,我们需要一些测量方法。\n",
"一个随机变量$X$的*期望*expectation,或平均值(average))表示为\n",
"\n",
"$$E[X] = \\sum_{x} x P(X = x).$$\n",
"\n",
"当函数$f(x)$的输入是从分布$P$中抽取的随机变量时,$f(x)$的期望值为\n",
"\n",
"$$E_{x \\sim P}[f(x)] = \\sum_x f(x) P(x).$$\n",
"\n",
"在许多情况下,我们希望衡量随机变量$X$与其期望值的偏置。这可以通过方差来量化\n",
"\n",
"$$\\mathrm{Var}[X] = E\\left[(X - E[X])^2\\right] =\n",
"E[X^2] - E[X]^2.$$\n",
"\n",
"方差的平方根被称为*标准差*standard deviation)。\n",
"随机变量函数的方差衡量的是:当从该随机变量分布中采样不同值$x$时,\n",
"函数值偏离该函数的期望的程度:\n",
"\n",
"$$\\mathrm{Var}[f(x)] = E\\left[\\left(f(x) - E[f(x)]\\right)^2\\right].$$\n",
"\n",
"## 小结\n",
"\n",
"* 我们可以从概率分布中采样。\n",
"* 我们可以使用联合分布、条件分布、Bayes定理、边缘化和独立性假设来分析多个随机变量。\n",
"* 期望和方差为概率分布的关键特征的概括提供了实用的度量形式。\n",
"\n",
"## 练习\n",
"\n",
"1. 进行$m=500$组实验,每组抽取$n=10$个样本。改变$m$和$n$,观察和分析实验结果。\n",
"2. 给定两个概率为$P(\\mathcal{A})$和$P(\\mathcal{B})$的事件,计算$P(\\mathcal{A} \\cup \\mathcal{B})$和$P(\\mathcal{A} \\cap \\mathcal{B})$的上限和下限。(提示:使用[友元图](https://en.wikipedia.org/wiki/Venn_diagram)来展示这些情况。)\n",
"3. 假设我们有一系列随机变量,例如$A$、$B$和$C$,其中$B$只依赖于$A$,而$C$只依赖于$B$,能简化联合概率$P(A, B, C)$吗?(提示:这是一个[马尔可夫链](https://en.wikipedia.org/wiki/Markov_chain)。)\n",
"4. 在 :numref:`subsec_probability_hiv_app`中,第一个测试更准确。为什么不运行第一个测试两次,而是同时运行第一个和第二个测试?\n"
]
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"[Discussions](https://discuss.d2l.ai/t/1762)\n"
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