[mlpack] [mlpack/mlpack] Anything wrong with hmm_train? (#833)

[MyNode]

Hi,
Thank you for your reply. I've tried the latest version. Good news is I did get a model, using the same testing data and command(`-o model.txt` was replaced by `-M model.txt`). But another problem is the viterbi algorithm, `mlpack_hmm_viterbi -m model.txt -i input.txt -o vtb.txt` (notice that I'm using the input.txt file, which has been used training the model), the result turns out to be `0 0 0 0...`, which means they all belong to the same state. By the way, the data has a size of 3×1056, I think it's quite enough. Again, if a label file is specified, everything would be ok.

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