자연어 처리 기초 참고: https://www.notion.so/PseudoLab-cbd14c5607f6471398ebf2db2a71a6b9#f6a51e7f5f764230a50825e03aeff053 텍스트 전처리 1. Tokenizing, Cleaning, Nomalization 2. Stemming, Lemmatization, Stopword 3. Regular Expression, Integer Encoding 4. Padding, One-hot-encoding, Splitting Data 논문 & 모델 리뷰 RNN BALT