1---基本概念：
Machine Learning：A computer program is said to learn from experience E with respect to some class of tasks T and performance measure P, if its performance at tasks in T, as measured by P, improves with experience E.
对于某给定任务T及合理的性能度量p,某计算机程序在T上以P衡量的性能随着经验E 自我完善。那么我们称这个计算机程序在从经验E学习。
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