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My Journey Into Predicting States Using Emoji Observations With Viterbi Algorithm. I have been asking my wife to select an emoticon daily on how she feels on a particular day. Observations and states are visible on me, but the states are hidden from me. I want to know her state daily, and so, I am modeling this scenario as a hidden Markov model. The “smile” emoji can come two ways: She could smile either being happy or being sad.