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If I get some posts on reddict.com, how can I predict whether this post will (trending/hot/popular) in the future or not? I would like to use the hidden markov model to predict it, but I don`t know how to define the hidden states and observation sequence...can anyone give me any suggestion? Thanks~
An HMM doesn't really make sense (echoing what Dries said). If you want to use an HMM, you would have to justify it by asking "Can Reddit posts be represented by a Markov process?" I can't think of a way to make that sentence true and still take advantage of the features related to a popular post.
Consider the possible feature set: the time it was posted, the user posting it, the type of post (link / image / text), the subreddit, the number of subscribers to that subreddit, a score of positivity / negativity, number of words in the title etc. Don't count out these features.
I don't think it makes a lot of sense to use HMM's for this problem. What I would suggest is some kind of text-based classifier. If you want to use a cool technique, you could use a neural network to learn based on the text of successful posts.
On the other hand, If you want to use an easy technique you could make a predictor for the popularity such as a regression model (try to predict upvotes).
