吴恩达机器学习 Part1

Machine learning definition
Well-posed learning problem: A computer program is said to learn from experience E with respect to some task T and some performance measure P, if its performance on T, as measured by P, improves with experience E.

Machine learning algorithms:

• supervised learning 我们教计算机做某件事
• unsupervised learning 计算机自己总结学会做某事

Others: Reinforcement learning, recommender systems.

---

supervised learning
想法是在监督学习中，对于数据集中的每个样本，我们想要算法预测并得到正确答案。
分类问题 classification problem 回归问题 regression problem

unsupervised learning
把大量的数据给到computer 计算机自习学会做某事