https://fidelislee.tistory.com/entry/Python-%EB%8D%B0%EC%9D%B4%ED%84%B0-%EB%B6%84%EC%84%9D-%EC%BD%98%ED%85%90%EC%B8%A0-%EC%B6%94%EC%B2%9C-KMeans-Clustering?category=896251