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机器学习 Machine Learning (查看源代码)

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<ref>Honglak Lee, Roger Grosse, Rajesh Ranganath, Andrew Y. Ng. "[http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.149.802&rep=rep1&type=pdf Convolutional Deep Belief Networks for Scalable Unsupervised Learning of Hierarchical Representations]" Proceedings of the 26th Annual International Conference on Machine Learning, 2009.</ref>。

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==== 决策树 ~~Decision trees~~ ====

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==== 决策树 ====

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:''~~主文章：~~[~~https://en.wikipedia.org/wiki/Decision_tree_learning 决策树学习~~]''

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'''决策树 Decision trees'''学习使用[[决策树]]作为预测模型，它将问题相关的观察结果映射为问题目标值的结论，是统计学、数据挖掘和机器学习中常用的预测建模方法之一。目标变量接受到的一组离散值的树模型称为分类树; 在这些树结构中，叶子代表类标签，分支代表连接到这些类标签的特征。其中目标变量可以取连续值（通常是实数）的决策树称为回归树。在决策分析中，可以使用决策树直观地表示决策和决策。在数据挖掘中，决策树是用来描述数据的，但得到的分类树可以作为决策的输入。

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Decision tree learning uses a [[decision tree]] as a [[Predictive modelling|predictive model]] to go from observations about an item (represented in the branches) to conclusions about the item's target value (represented in the leaves). It is one of the predictive modeling approaches used in statistics, data mining and machine learning. Tree models where the target variable can take a discrete set of values are called classification trees; in these tree structures, [[leaf node|leaves]] represent class labels and branches represent [[Logical conjunction|conjunction]]s of features that lead to those class labels. Decision trees where the target variable can take continuous values (typically [[real numbers]]) are called regression trees. In decision analysis, a decision tree can be used to visually and explicitly represent decisions and [[decision making]]. In data mining, a decision tree describes data, but the resulting classification tree can be an input for decision making.

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Decision tree learning uses a decision tree as a predictive model to go from observations about an item (represented in the branches) to conclusions about the item's target value (represented in the leaves). It is one of the predictive modeling approaches used in statistics, data mining and machine learning. Tree models where the target variable can take a discrete set of values are called classification trees; in these tree structures, leaves represent class labels and branches represent conjunctions of features that lead to those class labels. Decision trees where the target variable can take continuous values (typically real numbers) are called regression trees. In decision analysis, a decision tree can be used to visually and explicitly represent decisions and decision making. In data mining, a decision tree describes data, but the resulting classification tree can be an input for decision making.

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决策树学习使用[https://en.wikipedia.org/wiki/Decision_tree 决策树]作为[https://en.wikipedia.org/wiki/Predictive_modelling 预测模型]，它将问题相关的观察结果映射为问题目标值的结论，是统计学、数据挖掘和机器学习中常用的预测建模方法之一。目标变量接受到的一组离散值的树模型称为分类树; 在这些树结构中，叶子代表类标签，分支代表连接到这些类标签的特征。其中目标变量可以取连续值（通常是实数）的决策树称为回归树。在决策分析中，可以使用决策树直观地表示决策和决策。在数据挖掘中，决策树是用来描述数据的，但得到的分类树可以作为决策的输入。

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