RNN https://www.youtube.com/watch?v=bPRfnlG6dtU)
LSTM https://www.youtube.com/watch?v=cs3tSnAsyRs https://www.youtube.com/watch?v=bX6GLbpw-A4
Seq2Seq https://www.youtube.com/watch?v=4DzKM0vgG1Y
Attention https://wikidocs.net/228930 https://sooho-kim.tistory.com/89?category=919568
시각화자료 http://jalammar.github.io/visualizing-neural-machine-translation-mechanics-of-seq2seq-models-with-attention/
정리한 자료 https://docs.google.com/presentation/d/1dSXvKPgUMb3Pezzj6jdtwbJwO85oHHhNe1liZwcp2ew/edit#slide=id.gc3ea8607ac_0_302
