기계학습에 대해서 원문 : https://medium.com/@ageitgey/machine-learning-is-fun-80ea3ec3c471 번역 : https://medium.com/@jongdae.lim/%EA%B8%B0%EA%B3%84-%ED%95%99%EC%8A%B5-machine-learning-%EC%9D%80-%EC%A6%90%EA%B2%81%EB%8B%A4-part-1-9a0297198ad8