Improve speed up for forward-backward algorithm

In the previous post we were talking about repmat function in MEX format. We can reach further improvements if replace forward-backward procedure with C implementation (MEX format). The source code for the forward-backward in C can be found in PMTK which  is a collection of Matlab/Octave functions, written by Matt Dunham, Kevin Murphy.

The results  see below (with the same initial conditions):

Without MEX fwdbck

Without MEX fwdbck procudure

forward-backward MEX

forward-backward MEX

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