markdown信息和材料清单

# Some paths to main machine learning conepts
CheetSheet links:
* Deep learning: https://stanford.edu/~shervine/teaching/cs-229/cheatsheet-deep-learning
* Machine learninghttps://stanford.edu/~shervine/teaching/cs-229/cheatsheet-machine-learning-tips-and-tricks
* Supervised learning: https://stanford.edu/~shervine/teaching/cs-229/cheatsheet-supervised-learning
* Unsupervised learning: https://stanford.edu/~shervine/teaching/cs-229/cheatsheet-unsupervised-learning