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

[Ryan Curtin]

Try training with `--random_initialization`; this should fix the issue.  Without that option, the transition probabilities are initialized to all equal values and this can mess up the optimization.  When mlpack 2.1.1 is released the option will be removed because I will make random initialization the default---uniform initialization has caused too many problems to be reliable.

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