Andrew Ng Machine learning入门学习小结
2017-02-14 22:50
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Arthur Samuel(1959) 对机器学习的定义:这样的研究领域,在不经过人类经验基础上的编程而能够给予计算机学习的能力。
Tom Mitchell (1998) 对机器学习的定义:A computer program is said to learn from experience E with respect to some task T and performance P, if its performance on T, as measured by P, improves without experence E.
机器学习分为监督学习(supervised learning)和无监督学习
(unsupervised learning)。
监督学习:需要给定学习样本。
监督学习主要有:线性回归(linear regression)、逻辑回归(logic Regression)、神经网络(Neural Network)、支持向量(SVM)。
机器学习一般步骤:
1、假设函数:
hypothesis hθ(x)
3、参数:
parameters θ0,θ1
3、代价函数
cost function J(θ0,θ1)
4、目标函数
goal
minimizeJ(θ0,θ1)
基本思路:提出假设函数(模型),根据样本,以最小化代价函数为目标,计算出假设中的参数。
Tom Mitchell (1998) 对机器学习的定义:A computer program is said to learn from experience E with respect to some task T and performance P, if its performance on T, as measured by P, improves without experence E.
机器学习分为监督学习(supervised learning)和无监督学习
(unsupervised learning)。
监督学习:需要给定学习样本。
监督学习主要有:线性回归(linear regression)、逻辑回归(logic Regression)、神经网络(Neural Network)、支持向量(SVM)。
机器学习一般步骤:
1、假设函数:
hypothesis hθ(x)
3、参数:
parameters θ0,θ1
3、代价函数
cost function J(θ0,θ1)
4、目标函数
goal
minimizeJ(θ0,θ1)
基本思路:提出假设函数(模型),根据样本,以最小化代价函数为目标,计算出假设中的参数。
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