1.2 机器学习应用
通用人工智能(Artificial General Intelligence, AGI)
拥有和人类一样智能的人工智能
2.1 机器学习定义
Supervised learning(监督学习)
used most in real-world applications
Unsupervised learning(无监督学习)
2.2 监督学习
常见的监督学习：学习x到y或输入到输出映射的算法
key characteristic: ==you give your learning algorithm examples to learn from.==
Learns from being given "right answers": the correct label y for a given input x, and is by seeing correct pairs of input x and desired output label y that the learning algorithm eventually learns to take just the input alone without the output label and gives a reasonably accurate prediction or guess of the output.
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Regression(回归)
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Classification(分类)
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回归会预测无限多的可能数字，分类只会输出固定的类别，这些类别可以是非数字的
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