[mlpack-git] [mlpack] How to speed up HMM training ? (#550)

[Baptiste Wicht]

I just got the results this morning. It took almost 53 hours to train the GMM :(

> Have you compiled mlpack without debugging symbols? 

I'm using the release 2.0.1 built from sources with the default options, so I don't think there are debugging in it. 

> And I assume you're compiling your program with -O3 and without any debugging symbols or anything.

The program is compiled with -O2 -g -march=native with g++-4.9.3

> I think maybe to figure out what is going on here, you should try removing the HMM layer and just train a GMM on its own on the data

I haven't found out how to train a GMM with multiple sequences. Do I have to loop and call Train several times ? 

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https://github.com/mlpack/mlpack/issues/550#issuecomment-193635112
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