modify double np.hstack to single np.ravel #402
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When I tested the time with 880,591 x 1 series data,
the running time improved from almost 2.5 seconds to within 1.0 second.
I thought the usage of double np.hstack was for StateType.sequence_numerical. In this case, np.stack will be fine. But if there is something I missed, please let me know.